mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-24 17:46:32 +00:00
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.
40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -o - %s | FileCheck -check-prefix=CHECK32 %s
|
|
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck -check-prefix=CHECK64 %s
|
|
|
|
struct A {
|
|
long x, y;
|
|
};
|
|
|
|
struct B {
|
|
long x, y, z, w;
|
|
};
|
|
|
|
extern "C" {
|
|
|
|
int f1(A, A, A, A);
|
|
B f2(void);
|
|
_Complex float f3(void);
|
|
A &f4();
|
|
|
|
}
|
|
|
|
void test() {
|
|
A a;
|
|
|
|
// CHECK32: call i32 @f1(ptr nest noundef @f1
|
|
// CHECK64: call i32 @f1(ptr nest noundef @f1
|
|
__builtin_call_with_static_chain(f1(a, a, a, a), f1);
|
|
|
|
// CHECK32: call void @f2(ptr dead_on_unwind writable sret(%struct.B) align 4 %{{[0-9a-z]+}}, ptr nest noundef @f2)
|
|
// CHECK64: call void @f2(ptr dead_on_unwind writable sret(%struct.B) align 8 %{{[0-9a-z]+}}, ptr nest noundef @f2)
|
|
__builtin_call_with_static_chain(f2(), f2);
|
|
|
|
// CHECK32: call i64 @f3(ptr nest noundef @f3)
|
|
// CHECK64: call <2 x float> @f3(ptr nest noundef @f3)
|
|
__builtin_call_with_static_chain(f3(), f3);
|
|
|
|
// CHECK32: call nonnull align 4 dereferenceable(8) ptr @f4(ptr nest noundef @f4)
|
|
// CHECK64: call nonnull align 8 dereferenceable(16) ptr @f4(ptr nest noundef @f4)
|
|
__builtin_call_with_static_chain(f4(), f4);
|
|
}
|