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>
31 lines
1.2 KiB
LLVM
31 lines
1.2 KiB
LLVM
; RUN: llc -verify-machineinstrs -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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; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV
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; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv32-unknown-unknown %s -o - -filetype=obj | spirv-val %}
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; CHECK-SPIRV-DAG: %[[Float:.*]] = OpTypeFloat 32
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; CHECK-SPIRV-DAG: %[[FloatPtr:.*]] = OpTypePointer Function %[[Float]]
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; CHECK-SPIRV: OpInBoundsPtrAccessChain %[[FloatPtr]]
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; CHECK-SPIRV: OpInBoundsPtrAccessChain %[[FloatPtr]]
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; CHECK-SPIRV: OpSelect %[[FloatPtr]]
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; CHECK-SPIRV: OpLoad %[[Float]]
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%struct = type { [3 x float] }
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@G = global float 0.0
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define spir_kernel void @bar(i1 %sw) {
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entry:
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%var1 = alloca %struct
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store %struct zeroinitializer, ptr %var1
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%var2 = alloca %struct
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store %struct zeroinitializer, ptr %var2
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%elem1 = getelementptr inbounds [3 x float], ptr %var1, i64 0, i64 0
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%elem2 = getelementptr inbounds [3 x float], ptr %var2, i64 0, i64 1
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%elem = select i1 %sw, ptr %elem1, ptr %elem2
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%res = load float, ptr %elem
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store float %res, ptr @G
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ret void
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}
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