tree ab98a68086a0a261f84799d2e32558668cfa0d41
parent b572d53bf26c445798bdf2732d7519af0915a801
author David Neto <dneto@google.com> 1587416803 +0000
committer David Neto <dneto@google.com> 1587416803 +0000

[spirv-reader] Fix OpSDiv operand and result signedness

(I expect that) the WGSL signed division operator expects both operands
to be signed and the result will also be signed.

When the operands of a SPIR-V OpSDiv is unsigned, then wrap
the operand in an as-cast to the corresponding signed type.

When the result type of a SPIR-V OpSDiv instruction is unsigned,
we have to wrap the generated WGSL operator with an as-cast to
that unsigned type.

This first CL addresses OpSDiv.  We'll address other operations in future CLs.

Bug: tint:3
Change-Id: If3849ceb44b21db87c1efd2c6a2cd63c6d648c88
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/19800
Reviewed-by: dan sinclair <dsinclair@google.com>