9c29217a17
This PR fixes a problem in logics of cleaning unused constants, ensuring that cleaning of temporary constants doesn't purge tracked constants. On a rare occasion when this happens SPIR-V Backend emits a code that refers to a non-existent register, earlier related with a constant. Attached to the PR test case is a minimal reproducer where names of variables and instructions lead to such a rare coincidence.
26 lines
918 B
LLVM
26 lines
918 B
LLVM
; This test case ensures that cleaning of temporary constants doesn't purge tracked ones.
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; RUN: llc -O0 -mtriple=spirv64-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV
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; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown %s -o - -filetype=obj | spirv-val %}
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; CHECK-SPIRV: %[[#Int:]] = OpTypeInt 32 0
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; CHECK-SPIRV: %[[#C0:]] = OpConstant %[[#Int]] 0
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; CHECK-SPIRV: %[[#C1:]] = OpConstant %[[#Int]] 1
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; CHECK-SPIRV: OpSelect %[[#Int]] %[[#]] %[[#C1]] %[[#C0]]
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define spir_kernel void @foo() {
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entry:
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%addr = alloca i32
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%r1 = call i8 @_Z20__spirv_SpecConstantia(i32 0, i8 1)
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; The name '%conv17.i' is important for the test case,
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; because it includes i32 0 when encoded for SPIR-V usage.
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%conv17.i = sext i8 %r1 to i64
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%tobool = trunc i8 %r1 to i1
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%r2 = zext i1 %tobool to i32
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store i32 %r2, ptr %addr
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ret void
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}
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declare i8 @_Z20__spirv_SpecConstantia(i32, i8)
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