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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.
43 lines
873 B
C
43 lines
873 B
C
// RUN: %clang_cc1 -triple i686-windows-itanium -emit-llvm -o - %s | FileCheck %s
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struct f1 {
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float f;
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};
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struct f1 return_f1(void) { while (1); }
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// CHECK: define dso_local i32 @return_f1()
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void receive_f1(struct f1 a0) { }
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// CHECK: define dso_local void @receive_f1(float %a0.0)
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struct f2 {
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float f;
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float g;
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};
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struct f2 return_f2(void) { while (1); }
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// CHECK: define dso_local i64 @return_f2()
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void receive_f2(struct f2 a0) { }
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// CHECK: define dso_local void @receive_f2(float %a0.0, float %a0.1)
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struct f4 {
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float f;
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float g;
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float h;
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float i;
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};
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struct f4 return_f4(void) { while (1); }
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// CHECK: define dso_local void @return_f4(ptr dead_on_unwind noalias writable sret(%struct.f4) align 4 %agg.result)
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void receive_f4(struct f4 a0) { }
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// CHECK: define dso_local void @receive_f4(float %a0.0, float %a0.1, float %a0.2, float %a0.3)
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