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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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42
test/tint/statements/compound_assign/vector/modulo.wgsl.expected.spvasm
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@@ -1,7 +1,7 @@
; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 22
; Bound: 43
; Schema: 0
OpCapability Shader
OpMemoryModel Logical GLSL450
@@ -13,6 +13,9 @@
OpMemberName %S 0 "a"
OpName %v "v"
OpName %unused_entry_point "unused_entry_point"
OpName %tint_mod "tint_mod"
OpName %lhs "lhs"
OpName %rhs "rhs"
OpName %foo "foo"
OpDecorate %v_block Block
OpMemberDecorate %v_block 0 Offset 0
@@ -27,21 +30,44 @@
%v = OpVariable %_ptr_StorageBuffer_v_block StorageBuffer
%void = OpTypeVoid
%7 = OpTypeFunction %void
%11 = OpTypeFunction %v4int %v4int %v4int
%17 = OpConstantNull %v4int
%bool = OpTypeBool
%v4bool = OpTypeVector %bool 4
%int_n2147483648 = OpConstant %int -2147483648
%22 = OpConstantComposite %v4int %int_n2147483648 %int_n2147483648 %int_n2147483648 %int_n2147483648
%int_n1 = OpConstant %int -1
%25 = OpConstantComposite %v4int %int_n1 %int_n1 %int_n1 %int_n1
%int_1 = OpConstant %int 1
%30 = OpConstantComposite %v4int %int_1 %int_1 %int_1 %int_1
%uint = OpTypeInt 32 0
%uint_0 = OpConstant %uint 0
%_ptr_StorageBuffer_v4int = OpTypePointer StorageBuffer %v4int
%int_2 = OpConstant %int 2
%20 = OpConstantComposite %v4int %int_2 %int_2 %int_2 %int_2
%41 = OpConstantComposite %v4int %int_2 %int_2 %int_2 %int_2
%unused_entry_point = OpFunction %void None %7
%10 = OpLabel
OpReturn
OpFunctionEnd
%tint_mod = OpFunction %v4int None %11
%lhs = OpFunctionParameter %v4int
%rhs = OpFunctionParameter %v4int
%15 = OpLabel
%18 = OpIEqual %v4bool %rhs %17
%23 = OpIEqual %v4bool %lhs %22
%26 = OpIEqual %v4bool %rhs %25
%27 = OpLogicalAnd %v4bool %23 %26
%28 = OpLogicalOr %v4bool %18 %27
%16 = OpSelect %v4int %28 %30 %rhs
%31 = OpSMod %v4int %lhs %16
OpReturnValue %31
OpFunctionEnd
%foo = OpFunction %void None %7
%12 = OpLabel
%16 = OpAccessChain %_ptr_StorageBuffer_v4int %v %uint_0 %uint_0
%17 = OpAccessChain %_ptr_StorageBuffer_v4int %v %uint_0 %uint_0
%18 = OpLoad %v4int %17
%21 = OpSMod %v4int %18 %20
OpStore %16 %21
%33 = OpLabel
%38 = OpAccessChain %_ptr_StorageBuffer_v4int %v %uint_0 %uint_0
%39 = OpLoad %v4int %38
%34 = OpFunctionCall %v4int %tint_mod %39 %41
%42 = OpAccessChain %_ptr_StorageBuffer_v4int %v %uint_0 %uint_0
OpStore %42 %34
OpReturn
OpFunctionEnd