158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
23 lines
742 B
HLSL
23 lines
742 B
HLSL
// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
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// RUN: dxil-pc-shadermodel6.3-library %s \
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// RUN: -emit-llvm -disable-llvm-passes -o - | FileCheck %s
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// FIXME: add semantic to a.
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// See https://github.com/llvm/llvm-project/issues/57874
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struct S {
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float a;
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};
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// Make sure sret parameter is generated.
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// CHECK:define internal void @"?ps_main@@YA?AUS@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S) align 4 %agg.result)
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// FIXME: change it to real value instead of poison value once semantic is add to a.
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// Make sure the function with sret is called.
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// CHECK:call void @"?ps_main@@YA?AUS@@XZ"(ptr poison)
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[shader("pixel")]
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S ps_main() {
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S s;
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s.a = 0;
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return s;
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};
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