D3D: Add d3d_skip_shader_optimizations toggle Adds a new toggle, `d3d_skip_shader_optimizations`, to force the D3DCOMPILE_SKIP_OPTIMIZATION flag during shader compilation in D3D11 and D3D12. This can be used to speed up shader compilation time by skipping optimization passes. Bug: 439845637 Change-Id: Ie085076b5c2e66b196d812fbb9cc3c6686b75923 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/258114 Commit-Queue: Quyen Le <lehoangquyen@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>

diff --git a/src/dawn/native/Toggles.cpp b/src/dawn/native/Toggles.cpp
index 40d643e..38b3fc2 100644
--- a/src/dawn/native/Toggles.cpp
+++ b/src/dawn/native/Toggles.cpp

@@ -547,6 +547,10 @@
       "workaround issues where FXC can miscompile code that depends on special float values (NaN, "
       "INF, etc).",
       "https://crbug.com/tint/976", ToggleStage::Device}},
+    {Toggle::D3DSkipShaderOptimizations,
+     {"d3d_skip_shader_optimizations",
+      "Sets the D3DCOMPILE_SKIP_OPTIMIZATION compilation flag when compiling HLSL code.",
+      "https://crbug.com/439845637", ToggleStage::Device}},
     {Toggle::PolyFillPacked4x8DotProduct,
      {"polyfill_packed_4x8_dot_product",
       "Always use the polyfill version of dot4I8Packed() and dot4U8Packed().",

diff --git a/src/dawn/native/Toggles.h b/src/dawn/native/Toggles.h
index bf41d35..2320424 100644
--- a/src/dawn/native/Toggles.h
+++ b/src/dawn/native/Toggles.h

@@ -134,6 +134,7 @@
     D3D12CreateNotZeroedHeap,
     D3D12DontUseNotZeroedHeapFlagOnTexturesAsCommitedResources,
     D3DDisableIEEEStrictness,
+    D3DSkipShaderOptimizations,
     PolyFillPacked4x8DotProduct,
     PolyfillPackUnpack4x8Norm,
     EnableSubgroupsIntelGen9,

diff --git a/src/dawn/native/d3d11/ComputePipelineD3D11.cpp b/src/dawn/native/d3d11/ComputePipelineD3D11.cpp
index 038c754..95f523b 100644
--- a/src/dawn/native/d3d11/ComputePipelineD3D11.cpp
+++ b/src/dawn/native/d3d11/ComputePipelineD3D11.cpp

@@ -65,6 +65,9 @@
     if (device->IsToggleEnabled(Toggle::EmitHLSLDebugSymbols)) {
         compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
     }
+    if (device->IsToggleEnabled(Toggle::D3DSkipShaderOptimizations)) {
+        compileFlags |= D3DCOMPILE_SKIP_OPTIMIZATION;
+    }
 
     // Tint does matrix multiplication expecting row major matrices
     compileFlags |= D3DCOMPILE_PACK_MATRIX_ROW_MAJOR;

diff --git a/src/dawn/native/d3d11/RenderPipelineD3D11.cpp b/src/dawn/native/d3d11/RenderPipelineD3D11.cpp
index fca67bd..2e8ef8f 100644
--- a/src/dawn/native/d3d11/RenderPipelineD3D11.cpp
+++ b/src/dawn/native/d3d11/RenderPipelineD3D11.cpp

@@ -449,6 +449,9 @@
     if (device->IsToggleEnabled(Toggle::EmitHLSLDebugSymbols)) {
         compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
     }
+    if (device->IsToggleEnabled(Toggle::D3DSkipShaderOptimizations)) {
+        compileFlags |= D3DCOMPILE_SKIP_OPTIMIZATION;
+    }
 
     // Tint does matrix multiplication expecting row major matrices
     compileFlags |= D3DCOMPILE_PACK_MATRIX_ROW_MAJOR;

diff --git a/src/dawn/native/d3d12/ComputePipelineD3D12.cpp b/src/dawn/native/d3d12/ComputePipelineD3D12.cpp
index 92ee191..dd3de80 100644
--- a/src/dawn/native/d3d12/ComputePipelineD3D12.cpp
+++ b/src/dawn/native/d3d12/ComputePipelineD3D12.cpp

@@ -62,6 +62,10 @@
         compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
     }
 
+    if (device->IsToggleEnabled(Toggle::D3DSkipShaderOptimizations)) {
+        compileFlags |= D3DCOMPILE_SKIP_OPTIMIZATION;
+    }
+
     if (device->IsToggleEnabled(Toggle::UseDXC) &&
         ((compileFlags & D3DCOMPILE_OPTIMIZATION_LEVEL2) == 0)) {
         // DXC's default opt level is /O3, unlike FXC's /O1. Set explicitly, otherwise there's no

diff --git a/src/dawn/native/d3d12/RenderPipelineD3D12.cpp b/src/dawn/native/d3d12/RenderPipelineD3D12.cpp
index ec98d48..12ec7d9 100644
--- a/src/dawn/native/d3d12/RenderPipelineD3D12.cpp
+++ b/src/dawn/native/d3d12/RenderPipelineD3D12.cpp

@@ -327,6 +327,10 @@
         compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
     }
 
+    if (device->IsToggleEnabled(Toggle::D3DSkipShaderOptimizations)) {
+        compileFlags |= D3DCOMPILE_SKIP_OPTIMIZATION;
+    }
+
     if (device->IsToggleEnabled(Toggle::UseDXC) &&
         ((compileFlags & D3DCOMPILE_OPTIMIZATION_LEVEL2) == 0)) {
         // DXC's default opt level is /O3, unlike FXC's /O1. Set explicitly, otherwise there's no