35dfeb7b4d
The instruction selection pass for SPIR-V now performs dead code elimination (DCE). This change removes unused instructions, leading to more optimized SPIR-V output. As a consequence of this, several tests were updated to ensure their continued correctness and to prevent previously tested code from being optimized away. Specifically: - Many tests now store computed values into global variables to ensure they are not eliminated by DCE, allowing their code generation to be verified. - The test `keep-tracked-const.ll` was removed because it no longer tested its original intent. The check statements in this test were for constants generated when expanding a G_TRUNC instruction, which is now removed by DCE instead of being expanded. - A new test, `remove-dead-type-intrinsics.ll`, was added to confirm that dead struct types are correctly removed by the compiler. These updates improve the SPIR-V backends optimization capabilities and maintain the robustness of the test suite. --------- Co-authored-by: Nathan Gauër <github@keenuts.net>
36 lines
1.5 KiB
LLVM
36 lines
1.5 KiB
LLVM
; The goal of the test case is to ensure valid SPIR-V code emision
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; on translation of integers with bit width less than 8.
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; RUN: llc -O0 -mtriple=spirv64-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - | FileCheck %s --check-prefix=CHECK-SPIRV
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; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - -filetype=obj | spirv-val %}
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; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - | FileCheck %s --check-prefix=CHECK-SPIRV
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; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv32-unknown-unknown %s --spirv-ext=+SPV_KHR_bit_instructions -o - -filetype=obj | spirv-val %}
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; TODO: This test currently fails with LLVM_ENABLE_EXPENSIVE_CHECKS enabled
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; XFAIL: expensive_checks
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; CHECK-SPIRV: OpCapability BitInstructions
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; CHECK-SPIRV: OpExtension "SPV_KHR_bit_instructions"
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; CHECK-SPIRV: %[[#CharTy:]] = OpTypeInt 8 0
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; CHECK-SPIRV-NO: %[[#CharTy:]] = OpTypeInt 8 0
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; CHECK-SPIRV-COUNT-2: %[[#]] = OpBitReverse %[[#CharTy]] %[[#]]
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; TODO: Add a check to ensure that there's no behavior change of bitreverse operation
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; between the LLVM-IR and SPIR-V for i2 and i4
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@G_res2 = global i2 0
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@G_res4 = global i4 0
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define spir_func void @foo(i2 %a, i4 %b) {
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entry:
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%res2 = tail call i2 @llvm.bitreverse.i2(i2 %a)
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store i2 %res2, ptr @G_res2
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%res4 = tail call i4 @llvm.bitreverse.i4(i4 %b)
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store i4 %res4, ptr @G_res4
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ret void
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}
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declare i2 @llvm.bitreverse.i2(i2)
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declare i4 @llvm.bitreverse.i4(i4)
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