diff --git a/src/reader/spirv/function.cc b/src/reader/spirv/function.cc
index 3c42772..723f351 100644
--- a/src/reader/spirv/function.cc
+++ b/src/reader/spirv/function.cc
@@ -14,6 +14,7 @@
 
 #include "src/reader/spirv/function.h"
 
+#include <algorithm>
 #include <unordered_map>
 #include <unordered_set>
 #include <utility>
@@ -28,6 +29,7 @@
 #include "src/ast/assignment_statement.h"
 #include "src/ast/binary_expression.h"
 #include "src/ast/break_statement.h"
+#include "src/ast/case_statement.h"
 #include "src/ast/continue_statement.h"
 #include "src/ast/else_statement.h"
 #include "src/ast/fallthrough_statement.h"
@@ -38,6 +40,7 @@
 #include "src/ast/member_accessor_expression.h"
 #include "src/ast/return_statement.h"
 #include "src/ast/scalar_constructor_expression.h"
+#include "src/ast/sint_literal.h"
 #include "src/ast/storage_class.h"
 #include "src/ast/switch_statement.h"
 #include "src/ast/uint_literal.h"
@@ -387,7 +390,7 @@
     uint32_t end_id,
     CompletionAction completion_action,
     ast::StatementList statements,
-    ast::CaseStatementList cases)
+    std::unique_ptr<ast::CaseStatementList> cases)
     : construct_(construct),
       end_id_(end_id),
       completion_action_(completion_action),
@@ -401,9 +404,8 @@
 void FunctionEmitter::PushNewStatementBlock(const Construct* construct,
                                             uint32_t end_id,
                                             CompletionAction action) {
-  statements_stack_.emplace_back(StatementBlock(construct, end_id, action,
-                                                ast::StatementList{},
-                                                ast::CaseStatementList{}));
+  statements_stack_.emplace_back(
+      StatementBlock{construct, end_id, action, ast::StatementList{}, nullptr});
 }
 
 const ast::StatementList& FunctionEmitter::ast_body() {
@@ -981,7 +983,6 @@
 
     // Process case targets.
     for (uint32_t iarg = 2; iarg + 1 < branch->NumInOperands(); iarg += 2) {
-      const auto o = branch->GetInOperand(iarg);
       const auto value = branch->GetInOperand(iarg).AsLiteralUint64();
       const auto case_target_id = branch->GetSingleWordInOperand(iarg + 1);
 
@@ -1715,8 +1716,14 @@
         break;
 
       case Construct::kSwitchSelection:
+        if (!EmitStatementsInBasicBlock(block_info, &emitted)) {
+          return false;
+        }
+        if (!EmitSwitchStart(block_info)) {
+          return false;
+        }
         has_normal_terminator = false;
-        return Fail() << "unhandled: switch construct";
+        break;
     }
   }
 
@@ -1827,6 +1834,128 @@
   return success();
 }
 
+bool FunctionEmitter::EmitSwitchStart(const BlockInfo& block_info) {
+  // The block is the if-header block.  So its construct is the if construct.
+  auto* construct = block_info.construct;
+  assert(construct->kind == Construct::kSwitchSelection);
+  assert(construct->begin_id == block_info.id);
+  const auto* branch = block_info.basic_block->terminator();
+
+  auto* const switch_stmt =
+      AddStatement(std::make_unique<ast::SwitchStatement>())->AsSwitch();
+  const auto selector_id = branch->GetSingleWordInOperand(0);
+  // Generate the code for the selector.
+  auto selector = MakeExpression(selector_id);
+  switch_stmt->set_condition(std::move(selector.expr));
+
+  // First, push the statement block for the entire switch.  All the actual
+  // work is done by completion actions of the case/default clauses.
+  PushNewStatementBlock(
+      construct, construct->end_id, [switch_stmt](StatementBlock* s) {
+        switch_stmt->set_body(std::move(*std::move(s->cases_)));
+      });
+  statements_stack_.back().cases_ = std::make_unique<ast::CaseStatementList>();
+  // Grab a pointer to the case list.  It will get buried in the statement block
+  // stack.
+  auto* cases = statements_stack_.back().cases_.get();
+
+  // We will push statement-blocks onto the stack to gather the statements in
+  // the default clause and cases clauses. Determine the list of blocks
+  // that start each clause.
+  std::vector<const BlockInfo*> clause_heads;
+
+  // Collect the case clauses, even if they are just the merge block.
+  // First the default clause.
+  const auto default_id = branch->GetSingleWordInOperand(1);
+  const auto* default_info = GetBlockInfo(default_id);
+  clause_heads.push_back(default_info);
+  // Now the case clauses.
+  for (uint32_t iarg = 2; iarg + 1 < branch->NumInOperands(); iarg += 2) {
+    const auto case_target_id = branch->GetSingleWordInOperand(iarg + 1);
+    clause_heads.push_back(GetBlockInfo(case_target_id));
+  }
+
+  std::stable_sort(clause_heads.begin(), clause_heads.end(),
+                   [](const BlockInfo* lhs, const BlockInfo* rhs) {
+                     return lhs->pos < rhs->pos;
+                   });
+  // Remove duplicates
+  {
+    // Use read index r, and write index w.
+    // Invariant: w <= r;
+    size_t w = 0;
+    for (size_t r = 0; r < clause_heads.size(); ++r) {
+      if (clause_heads[r] != clause_heads[w]) {
+        ++w;  // Advance the write cursor.
+      }
+      clause_heads[w] = clause_heads[r];
+    }
+    // We know it's not empty because it always has at least a default clause.
+    assert(!clause_heads.empty());
+    clause_heads.resize(w + 1);
+  }
+
+  // Push them on in reverse order.
+  const auto last_clause_index = clause_heads.size() - 1;
+  for (size_t i = last_clause_index;; --i) {
+    // Create the case clause.  Temporarily put it in the wrong order
+    // on the case statement list.
+    cases->emplace_back(std::make_unique<ast::CaseStatement>());
+    auto* clause = cases->back().get();
+
+    // Create a list of integer literals for the selector values leading to
+    // this case clause.
+    ast::CaseSelectorList selectors;
+    const auto* values_ptr = clause_heads[i]->case_values.get();
+    const bool has_selectors = (values_ptr && !values_ptr->empty());
+    if (has_selectors) {
+      std::vector<uint64_t> values(values_ptr->begin(), values_ptr->end());
+      std::stable_sort(values.begin(), values.end());
+      for (auto value : values) {
+        // The rest of this module can handle up to 64 bit switch values.
+        // The Tint AST handles 32-bit values.
+        const uint32_t value32 = uint32_t(value & 0xFFFFFFFF);
+        if (selector.type->is_unsigned_scalar_or_vector()) {
+          selectors.emplace_back(
+              std::make_unique<ast::UintLiteral>(selector.type, value32));
+        } else {
+          selectors.emplace_back(
+              std::make_unique<ast::SintLiteral>(selector.type, value32));
+        }
+      }
+      clause->set_selectors(std::move(selectors));
+    }
+
+    // Where does this clause end?
+    const auto end_id = (i + 1 < clause_heads.size()) ? clause_heads[i + 1]->id
+                                                      : construct->end_id;
+
+    PushNewStatementBlock(construct, end_id, [clause](StatementBlock* s) {
+      clause->set_body(std::move(s->statements_));
+    });
+
+    if ((default_info == clause_heads[i]) && has_selectors &&
+        construct->ContainsPos(default_info->pos)) {
+      // Generate a default clause with a just fallthrough.
+      ast::StatementList stmts;
+      stmts.emplace_back(std::make_unique<ast::FallthroughStatement>());
+      auto case_stmt = std::make_unique<ast::CaseStatement>();
+      case_stmt->set_body(std::move(stmts));
+      cases->emplace_back(std::move(case_stmt));
+    }
+
+    if (i == 0) {
+      break;
+    }
+  }
+
+  // We've listed cases in reverse order in the switch statement. Reorder them
+  // to match the presentation order in WGSL.
+  std::reverse(cases->begin(), cases->end());
+
+  return success();
+}
+
 bool FunctionEmitter::EmitLoopStart(const Construct* construct) {
   auto* loop = AddStatement(std::make_unique<ast::LoopStatement>())->AsLoop();
   PushNewStatementBlock(
@@ -1946,7 +2075,31 @@
     case EdgeKind::kBack:
       // Nothing to do. The loop backedge is implicit.
       break;
-    case EdgeKind::kSwitchBreak:
+    case EdgeKind::kSwitchBreak: {
+      // Don't bother with a break at the end of a case.
+      const auto header = dest_info.header_for_merge;
+      assert(header != 0);
+      const auto* exiting_construct = GetBlockInfo(header)->construct;
+      assert(exiting_construct->kind == Construct::kSwitchSelection);
+      const auto candidate_next_case_pos = src_info.pos + 1;
+      // Leaving the last block from the last case?
+      if (candidate_next_case_pos == dest_info.pos) {
+        // No break needed.
+        return nullptr;
+      }
+      // Leaving the last block from not-the-last-case?
+      if (exiting_construct->ContainsPos(candidate_next_case_pos)) {
+        const auto* candidate_next_case =
+            GetBlockInfo(block_order_[candidate_next_case_pos]);
+        if (candidate_next_case->case_head_for == exiting_construct ||
+            candidate_next_case->default_head_for == exiting_construct) {
+          // No break needed.
+          return nullptr;
+        }
+      }
+      // We need a break.
+      return std::make_unique<ast::BreakStatement>();
+    }
     case EdgeKind::kLoopBreak:
       return std::make_unique<ast::BreakStatement>();
     case EdgeKind::kLoopContinue:
diff --git a/src/reader/spirv/function.h b/src/reader/spirv/function.h
index a96f7e8..a5a5347 100644
--- a/src/reader/spirv/function.h
+++ b/src/reader/spirv/function.h
@@ -289,6 +289,13 @@
   /// @returns false if emission failed.
   bool EmitIfStart(const BlockInfo& block_info);
 
+  /// Emits a SwitchStatement, including its condition expression, and sets
+  /// up the statement stack to accumulate subsequent basic blocks into
+  /// the default clause and case clauses.
+  /// @param block_info the switch-selection header block
+  /// @returns false if emission failed.
+  bool EmitSwitchStart(const BlockInfo& block_info);
+
   /// Emits a LoopStatement, and pushes a new StatementBlock to accumulate
   /// the remaining instructions in the current block and subsequent blocks
   /// in the loop.
@@ -375,7 +382,7 @@
   /// Gets the block info for a block ID, if any exists
   /// @param id the SPIR-V ID of the OpLabel instruction starting the block
   /// @returns the block info for the given ID, if it exists, or nullptr
-  BlockInfo* GetBlockInfo(uint32_t id) {
+  BlockInfo* GetBlockInfo(uint32_t id) const {
     auto where = block_info_.find(id);
     if (where == block_info_.end())
       return nullptr;
@@ -434,7 +441,7 @@
                    uint32_t end_id,
                    CompletionAction completion_action,
                    ast::StatementList statements,
-                   ast::CaseStatementList cases);
+                   std::unique_ptr<ast::CaseStatementList> cases);
     StatementBlock(StatementBlock&&);
     ~StatementBlock();
 
@@ -449,10 +456,13 @@
 
     // Only one of |statements| or |cases| is active.
 
-    // The list of statements being built.
+    // The list of statements being built, if this construct is not a switch.
     ast::StatementList statements_;
-    // The list of cases being built, for a switch.
-    ast::CaseStatementList cases_;
+    // The list of switch cases being built, if this construct is a switch.
+    // The algorithm will cache a pointer to the vector.  We want that pointer
+    // to be stable no matter how |statements_stack_| is resized.  That's
+    // why we make this a unique_ptr rather than just a plain vector.
+    std::unique_ptr<ast::CaseStatementList> cases_;
   };
 
   /// Pushes an empty statement block onto the statements stack.
diff --git a/src/reader/spirv/function_cfg_test.cc b/src/reader/spirv/function_cfg_test.cc
index 4d64864..4cf029d 100644
--- a/src/reader/spirv/function_cfg_test.cc
+++ b/src/reader/spirv/function_cfg_test.cc
@@ -60,7 +60,9 @@
     %cond3 = OpConstantFalse %bool
 
     %uint = OpTypeInt 32 0
+    %int = OpTypeInt 32 1
     %selector = OpConstant %uint 42
+    %signed_selector = OpConstant %int 42
 
     %uintfn = OpTypeFunction %uint
 
@@ -72,6 +74,11 @@
     %uint_5 = OpConstant %uint 5
     %uint_6 = OpConstant %uint 6
     %uint_7 = OpConstant %uint 7
+    %uint_8 = OpConstant %uint 8
+    %uint_20 = OpConstant %uint 20
+    %uint_30 = OpConstant %uint 30
+    %uint_40 = OpConstant %uint 40
+    %uint_50 = OpConstant %uint 50
 
     %ptr_Private_uint = OpTypePointer Private %uint
     %var = OpVariable %ptr_Private_uint Private
@@ -8757,6 +8764,486 @@
 )")) << ToString(fe.ast_body());
 }
 
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsMerge_NoCases) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+// First do no special control flow: no fallthroughs, breaks, continues.
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsMerge_OneCase) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsMerge_TwoCases) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20 30 %30
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 30{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsMerge_CasesWithDup) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20 30 %30 40 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 30{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Case 20, 40{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsCase_NoDupCases) {
+  // The default block is not the merge block. But not the same as a case
+  // either.
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %30 20 %20 40 %40
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel ; the named default block
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 40{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{40}
+      }
+    }
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_DefaultIsCase_WithDupCase) {
+  // The default block is not the merge block and is the same as a case.
+  // We emit the default case separately, but just before the labeled
+  // case, and with a fallthrough.
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %30 20 %20 30 %30 40 %40
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel ; the named default block, also a case
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 40{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{40}
+      }
+    }
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+      Fallthrough{}
+    }
+    Case 30{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_Case_SintValue) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     ; SPIR-V assembler doesn't support negative literals in switch
+     OpSwitch %signed_selector %99 20 %20 2000000000 %30 !4000000000 %40
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case -294967296{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{40}
+      }
+    }
+    Case 2000000000{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Switch_Case_UintValue) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20 2000000000 %30 50 %40
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 50{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{40}
+      }
+    }
+    Case 2000000000{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
 TEST_F(SpvParserTest, EmitBody_Return_TopLevel) {
   auto* p = parser(test::Assemble(CommonTypes() + R"(
      %100 = OpFunction %void None %voidfn
@@ -9227,8 +9714,128 @@
 )")) << ToString(fe.ast_body());
 }
 
-TEST_F(SpvParserTest, DISABLED_EmitBody_Branch_SwitchBreak) {
-  // TODO(dneto): support switch first.
+TEST_F(SpvParserTest, EmitBody_Branch_SwitchBreak_LastInCase) {
+  // When the break is last in its case, we omit it because it's implicit in
+  // WGSL.
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranch %99 ; branch to merge. Last in case
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_Branch_SwitchBreak_NotLastInCase) {
+  // When the break is not last in its case, we must emit a 'break'
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpSelectionMerge %50 None
+     OpBranchConditional %cond %40 %50
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranch %99 ; branch to merge. Not last in case
+
+     %50 = OpLabel ; inner merge
+     OpStore %var %uint_50
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+      If{
+        (
+          ScalarConstructor{false}
+        )
+        {
+          Assignment{
+            Identifier{var}
+            ScalarConstructor{40}
+          }
+          Break{}
+        }
+      }
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{50}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
 }
 
 TEST_F(SpvParserTest, EmitBody_Branch_LoopBreak_MultiBlockLoop_FromBody) {
@@ -9459,6 +10066,91 @@
 )")) << ToString(fe.ast_body());
 }
 
+TEST_F(SpvParserTest, EmitBody_Branch_LoopContinue_FromSwitch) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpBranch %20
+
+     %20 = OpLabel
+     OpStore %var %uint_2
+     OpLoopMerge %99 %80 None
+     OpBranch %30
+
+     %30 = OpLabel
+     OpStore %var %uint_3
+     OpSelectionMerge %79 None
+     OpSwitch %selector %79 40 %40
+
+     %40 = OpLabel
+     OpStore %var %uint_4
+     OpBranch %80 ; continue edge
+
+     %79 = OpLabel ; switch merge
+     OpStore %var %uint_5
+     OpBranch %80
+
+     %80 = OpLabel ; continue target
+     OpStore %var %uint_6
+     OpBranch %20
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Loop{
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{2}
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{3}
+  }
+  Switch{
+    ScalarConstructor{42}
+    {
+      Case 40{
+        Assignment{
+          Identifier{var}
+          ScalarConstructor{4}
+        }
+        Continue{}
+      }
+      Default{
+      }
+    }
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{5}
+  }
+  continuing {
+    Assignment{
+      Identifier{var}
+      ScalarConstructor{6}
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
 TEST_F(SpvParserTest, EmitBody_Branch_IfBreak_FromThen) {
   // When unconditional, the if-break must be last in the then clause.
   auto* p = parser(test::Assemble(CommonTypes() + R"(
@@ -9546,7 +10238,7 @@
 }
 
 TEST_F(SpvParserTest, DISABLED_EmitBody_Branch_Fallthrough) {
-  // TODO(dneto): support switch first.
+  // TODO(dneto): support fallthrough first.
 }
 
 TEST_F(SpvParserTest, EmitBody_Branch_Forward) {
@@ -9901,33 +10593,459 @@
 }
 
 TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_SwitchBreak_Continue_OnTrue) {
-  // TODO(dneto): needs switch support
+       EmitBody_BranchConditional_SwitchBreak_SwitchBreak_LastInCase) {
+  // When the break is last in its case, we omit it because it's implicit in
+  // WGSL.
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranchConditional %cond2 %99 %99 ; branch to merge. Last in case
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
 }
 
 TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_SwitchBreak_Continue_OnFalse) {
-  // TODO(dneto): needs switch support
+       EmitBody_BranchConditional_SwitchBreak_SwitchBreak_NotLastInCase) {
+  // When the break is not last in its case, we must emit a 'break'
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpSelectionMerge %50 None
+     OpBranchConditional %cond %40 %50
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranchConditional %cond2 %99 %99 ; branch to merge. Not last in case
+
+     %50 = OpLabel ; inner merge
+     OpStore %var %uint_50
+     OpBranch %99
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+      If{
+        (
+          ScalarConstructor{false}
+        )
+        {
+          Assignment{
+            Identifier{var}
+            ScalarConstructor{40}
+          }
+          Break{}
+        }
+      }
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{50}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
 }
 
-TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_SwitchBreak_Forward_OnTrue) {
-  // TODO(dneto): needs switch support
+TEST_F(SpvParserTest, EmitBody_BranchConditional_SwitchBreak_Continue_OnTrue) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpBranch %20
+
+     %20 = OpLabel
+     OpStore %var %uint_2
+     OpLoopMerge %99 %80 None
+     OpBranch %30
+
+     %30 = OpLabel
+     OpStore %var %uint_3
+     OpSelectionMerge %79 None
+     OpSwitch %selector %79 40 %40
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranchConditional %cond %80 %79 ; break; continue on true
+
+     %79 = OpLabel
+     OpStore %var %uint_6
+     OpBranch %80
+
+     %80 = OpLabel ; continue target
+     OpStore %var %uint_7
+     OpBranch %20
+
+     %99 = OpLabel ; loop merge
+     OpStore %var %uint_8
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Loop{
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{2}
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{3}
+  }
+  Switch{
+    ScalarConstructor{42}
+    {
+      Case 40{
+        Assignment{
+          Identifier{var}
+          ScalarConstructor{40}
+        }
+        If{
+          (
+            ScalarConstructor{false}
+          )
+          {
+            Continue{}
+          }
+        }
+      }
+      Default{
+      }
+    }
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{6}
+  }
+  continuing {
+    Assignment{
+      Identifier{var}
+      ScalarConstructor{7}
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{8}
+}
+Return{}
+)")) << ToString(fe.ast_body());
 }
 
-TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_SwitchBreak_Forward_OnFalse) {
-  // TODO(dneto): needs switch support
+TEST_F(SpvParserTest, EmitBody_BranchConditional_SwitchBreak_Continue_OnFalse) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpBranch %20
+
+     %20 = OpLabel
+     OpStore %var %uint_2
+     OpLoopMerge %99 %80 None
+     OpBranch %30
+
+     %30 = OpLabel
+     OpStore %var %uint_3
+     OpSelectionMerge %79 None
+     OpSwitch %selector %79 40 %40
+
+     %40 = OpLabel
+     OpStore %var %uint_40
+     OpBranchConditional %cond %79 %80 ; break; continue on false
+
+     %79 = OpLabel
+     OpStore %var %uint_6
+     OpBranch %80
+
+     %80 = OpLabel ; continue target
+     OpStore %var %uint_7
+     OpBranch %20
+
+     %99 = OpLabel ; loop merge
+     OpStore %var %uint_8
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Loop{
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{2}
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{3}
+  }
+  Switch{
+    ScalarConstructor{42}
+    {
+      Case 40{
+        Assignment{
+          Identifier{var}
+          ScalarConstructor{40}
+        }
+        If{
+          (
+            ScalarConstructor{false}
+          )
+          {
+          }
+        }
+        Else{
+          {
+            Continue{}
+          }
+        }
+      }
+      Default{
+      }
+    }
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{6}
+  }
+  continuing {
+    Assignment{
+      Identifier{var}
+      ScalarConstructor{7}
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{8}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_BranchConditional_SwitchBreak_Forward_OnTrue) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranchConditional %cond %30 %99 ; break; forward on true
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %99 = OpLabel ; switch merge
+     OpStore %var %uint_8
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+      If{
+        (
+          ScalarConstructor{false}
+        )
+        {
+        }
+      }
+      Else{
+        {
+          Break{}
+        }
+      }
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{8}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
+TEST_F(SpvParserTest, EmitBody_BranchConditional_SwitchBreak_Forward_OnFalse) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpSelectionMerge %99 None
+     OpSwitch %selector %99 20 %20
+
+     %20 = OpLabel
+     OpStore %var %uint_20
+     OpBranchConditional %cond %99 %30 ; break; forward on false
+
+     %30 = OpLabel
+     OpStore %var %uint_30
+     OpBranch %99
+
+     %99 = OpLabel ; switch merge
+     OpStore %var %uint_8
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Switch{
+  ScalarConstructor{42}
+  {
+    Case 20{
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{20}
+      }
+      If{
+        (
+          ScalarConstructor{false}
+        )
+        {
+          Break{}
+        }
+      }
+      Assignment{
+        Identifier{var}
+        ScalarConstructor{30}
+      }
+    }
+    Default{
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{8}
+}
+Return{}
+)")) << ToString(fe.ast_body());
 }
 
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_SwitchBreak_Fallthrough_OnTrue) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_SwitchBreak_Fallthrough_OnFalse) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 
 TEST_F(SpvParserTest,
@@ -10232,11 +11350,11 @@
 
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_LoopBreak_Fallthrough_OnTrue) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_LoopBreak_Fallthrough_OnFalse) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 
 TEST_F(SpvParserTest, EmitBody_BranchConditional_LoopBreak_Forward_OnTrue) {
@@ -10668,6 +11786,91 @@
 )")) << ToString(fe.ast_body());
 }
 
+TEST_F(SpvParserTest, EmitBody_BranchConditional_LoopContinue_FromSwitch) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpBranch %20
+
+     %20 = OpLabel
+     OpStore %var %uint_2
+     OpLoopMerge %99 %80 None
+     OpBranch %30
+
+     %30 = OpLabel
+     OpStore %var %uint_3
+     OpSelectionMerge %79 None
+     OpSwitch %selector %79 40 %40
+
+     %40 = OpLabel
+     OpStore %var %uint_4
+     OpBranchConditional %cond2 %80 %80; dup continue edge
+
+     %79 = OpLabel ; switch merge
+     OpStore %var %uint_5
+     OpBranch %80
+
+     %80 = OpLabel ; continue target
+     OpStore %var %uint_6
+     OpBranch %20
+
+     %99 = OpLabel
+     OpStore %var %uint_7
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
+}
+Loop{
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{2}
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{3}
+  }
+  Switch{
+    ScalarConstructor{42}
+    {
+      Case 40{
+        Assignment{
+          Identifier{var}
+          ScalarConstructor{4}
+        }
+        Continue{}
+      }
+      Default{
+      }
+    }
+  }
+  Assignment{
+    Identifier{var}
+    ScalarConstructor{5}
+  }
+  continuing {
+    Assignment{
+      Identifier{var}
+      ScalarConstructor{6}
+    }
+  }
+}
+Assignment{
+  Identifier{var}
+  ScalarConstructor{7}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
 TEST_F(SpvParserTest, EmitBody_BranchConditional_Continue_IfBreak_OnTrue) {
   auto* p = parser(test::Assemble(CommonTypes() + R"(
      %100 = OpFunction %void None %voidfn
@@ -10856,11 +12059,11 @@
 
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_Continue_Fallthrough_OnTrue) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_Continue_Fallthrough_OnFalse) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
 
 TEST_F(SpvParserTest, EmitBody_BranchConditional_Continue_Forward_OnTrue) {
@@ -11098,20 +12301,67 @@
 TEST_F(SpvParserTest,
        DISABLED_EmitBody_BranchConditional_Fallthrough_Fallthrough_Same) {
   // Can only be to the same target.
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
+
 TEST_F(
     SpvParserTest,
     DISABLED_EmitBody_BranchConditional_Fallthrough_Fallthrough_Different_IsError) {
-  // TODO(dneto): needs switch support
+  // TODO(dneto): needs fallthrough support
 }
-TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_Forward_Forward_Same) {
-  // TODO(dneto): needs switch support
+
+TEST_F(SpvParserTest, EmitBody_BranchConditional_Forward_Forward_Same) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpStore %var %uint_1
+     OpBranchConditional %cond %99 %99; forward
+
+     %99 = OpLabel
+     OpStore %var %uint_2
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_TRUE(fe.EmitBody()) << p->error();
+  EXPECT_THAT(ToString(fe.ast_body()), Eq(R"(Assignment{
+  Identifier{var}
+  ScalarConstructor{1}
 }
+Assignment{
+  Identifier{var}
+  ScalarConstructor{2}
+}
+Return{}
+)")) << ToString(fe.ast_body());
+}
+
 TEST_F(SpvParserTest,
-       DISABLED_EmitBody_BranchConditional_Forward_Forward_Different_IsError) {
-  // TODO(dneto): needs switch support
+       EmitBody_BranchConditional_Forward_Forward_Different_IsError) {
+  auto* p = parser(test::Assemble(CommonTypes() + R"(
+     %100 = OpFunction %void None %voidfn
+
+     %10 = OpLabel
+     OpBranchConditional %cond %20 %99
+
+     %20 = OpLabel
+     OpReturn
+
+     %99 = OpLabel
+     OpStore %var %uint_2
+     OpReturn
+
+     OpFunctionEnd
+  )"));
+  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
+  FunctionEmitter fe(p, *spirv_function(100));
+  EXPECT_FALSE(fe.EmitBody());
+  EXPECT_THAT(p->error(),
+              Eq("Control flow diverges at block 10 (to 20, 99) but it is not "
+                 "a structured header (it has no merge instruction)"));
 }
 
 TEST_F(SpvParserTest,