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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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57
test/tint/statements/compound_assign/function.wgsl.expected.spvasm
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@@ -1,13 +1,16 @@
; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 31
; Bound: 47
; Schema: 0
OpCapability Shader
OpMemoryModel Logical GLSL450
OpEntryPoint GLCompute %unused_entry_point "unused_entry_point"
OpExecutionMode %unused_entry_point LocalSize 1 1 1
OpName %unused_entry_point "unused_entry_point"
OpName %tint_div "tint_div"
OpName %lhs "lhs"
OpName %rhs "rhs"
OpName %foo "foo"
OpName %a "a"
OpName %b "b"
@@ -15,37 +18,55 @@
%void = OpTypeVoid
%1 = OpTypeFunction %void
%int = OpTypeInt 32 1
%5 = OpTypeFunction %int %int %int
%12 = OpConstantNull %int
%bool = OpTypeBool
%int_n2147483648 = OpConstant %int -2147483648
%int_n1 = OpConstant %int -1
%int_1 = OpConstant %int 1
%_ptr_Function_int = OpTypePointer Function %int
%10 = OpConstantNull %int
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Function_v4float = OpTypePointer Function %v4float
%15 = OpConstantNull %v4float
%31 = OpConstantNull %v4float
%v2float = OpTypeVector %float 2
%mat2v2float = OpTypeMatrix %v2float 2
%_ptr_Function_mat2v2float = OpTypePointer Function %mat2v2float
%20 = OpConstantNull %mat2v2float
%36 = OpConstantNull %mat2v2float
%int_2 = OpConstant %int 2
%mat4v4float = OpTypeMatrix %v4float 4
%26 = OpConstantNull %mat4v4float
%42 = OpConstantNull %mat4v4float
%float_2 = OpConstant %float 2
%unused_entry_point = OpFunction %void None %1
%4 = OpLabel
OpReturn
OpFunctionEnd
%tint_div = OpFunction %int None %5
%lhs = OpFunctionParameter %int
%rhs = OpFunctionParameter %int
%10 = OpLabel
%13 = OpIEqual %bool %rhs %12
%16 = OpIEqual %bool %lhs %int_n2147483648
%18 = OpIEqual %bool %rhs %int_n1
%19 = OpLogicalAnd %bool %16 %18
%20 = OpLogicalOr %bool %13 %19
%11 = OpSelect %int %20 %int_1 %rhs
%22 = OpSDiv %int %lhs %11
OpReturnValue %22
OpFunctionEnd
%foo = OpFunction %void None %1
%6 = OpLabel
%a = OpVariable %_ptr_Function_int Function %10
%b = OpVariable %_ptr_Function_v4float Function %15
%c = OpVariable %_ptr_Function_mat2v2float Function %20
%21 = OpLoad %int %a
%23 = OpSDiv %int %21 %int_2
OpStore %a %23
%24 = OpLoad %v4float %b
%27 = OpVectorTimesMatrix %v4float %24 %26
OpStore %b %27
%28 = OpLoad %mat2v2float %c
%30 = OpMatrixTimesScalar %mat2v2float %28 %float_2
OpStore %c %30
%24 = OpLabel
%a = OpVariable %_ptr_Function_int Function %12
%b = OpVariable %_ptr_Function_v4float Function %31
%c = OpVariable %_ptr_Function_mat2v2float Function %36
%38 = OpLoad %int %a
%37 = OpFunctionCall %int %tint_div %38 %int_2
OpStore %a %37
%40 = OpLoad %v4float %b
%43 = OpVectorTimesMatrix %v4float %40 %42
OpStore %b %43
%44 = OpLoad %mat2v2float %c
%46 = OpMatrixTimesScalar %mat2v2float %44 %float_2
OpStore %c %46
OpReturn
OpFunctionEnd