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tint/transform: Implement div / mod polyfill

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Prevents UB for divide-by-zero and integer overflow when dividing

Fixed: tint:1349
Change-Id: Ieef66d27d7aec3011628ced076b2bccc7770a8af
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108925
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
This commit is contained in:
Ben Clayton
2022-11-09 22:04:11 +00:00
committed by Dawn LUCI CQ
parent 9418152d08
commit 46ee63933c
427 changed files with 7255 additions and 3789 deletions
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27
test/tint/expressions/binary/div/scalar-scalar/u32.wgsl.expected.spvasm
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@@ -1,20 +1,35 @@
; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 9
; Bound: 19
; Schema: 0
OpCapability Shader
OpMemoryModel Logical GLSL450
OpEntryPoint GLCompute %f "f"
OpExecutionMode %f LocalSize 1 1 1
OpName %tint_div "tint_div"
OpName %lhs "lhs"
OpName %rhs "rhs"
OpName %f "f"
%void = OpTypeVoid
%1 = OpTypeFunction %void
%uint = OpTypeInt 32 0
%1 = OpTypeFunction %uint %uint %uint
%8 = OpConstantNull %uint
%bool = OpTypeBool
%uint_1 = OpConstant %uint 1
%void = OpTypeVoid
%13 = OpTypeFunction %void
%uint_2 = OpConstant %uint 2
%f = OpFunction %void None %1
%4 = OpLabel
%8 = OpUDiv %uint %uint_1 %uint_2
%tint_div = OpFunction %uint None %1
%lhs = OpFunctionParameter %uint
%rhs = OpFunctionParameter %uint
%6 = OpLabel
%9 = OpIEqual %bool %rhs %8
%7 = OpSelect %uint %9 %uint_1 %rhs
%12 = OpUDiv %uint %lhs %7
OpReturnValue %12
OpFunctionEnd
%f = OpFunction %void None %13
%16 = OpLabel
%18 = OpFunctionCall %uint %tint_div %uint_1 %uint_2
OpReturn
OpFunctionEnd