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.
22 lines
1.2 KiB
C
22 lines
1.2 KiB
C
// REQUIRES: powerpc-registered-target
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// Verify ABI selection by the front end
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// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: | FileCheck %s --check-prefix=CHECK-ELFv1
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// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: -target-abi elfv1 | FileCheck %s --check-prefix=CHECK-ELFv1
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// RUN: %clang_cc1 -triple powerpc64-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: -target-abi elfv2 | FileCheck %s --check-prefix=CHECK-ELFv2
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// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: | FileCheck %s --check-prefix=CHECK-ELFv2
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// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: -target-abi elfv1 | FileCheck %s --check-prefix=CHECK-ELFv1
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// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: -target-abi elfv2 | FileCheck %s --check-prefix=CHECK-ELFv2
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// CHECK-ELFv1: define{{.*}} void @func_fab(ptr dead_on_unwind noalias writable sret(%struct.fab) align 4 %agg.result, i64 %x.coerce)
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// CHECK-ELFv2: define{{.*}} [2 x float] @func_fab([2 x float] %x.coerce)
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struct fab { float a; float b; };
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struct fab func_fab(struct fab x) { return x; }
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