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.
36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
// REQUIRES: powerpc-registered-target
|
|
// RUN: %clang_cc1 -triple powerpc-unknown-aix \
|
|
// RUN: -emit-llvm -o - -x c++ %s | \
|
|
// RUN: FileCheck %s --check-prefixes=AIX,AIX32
|
|
// RUN: %clang_cc1 -triple powerpc64-unknown-aix \
|
|
// RUN: -emit-llvm -o - %s -x c++| \
|
|
// RUN: FileCheck %s --check-prefixes=AIX,AIX64
|
|
|
|
struct B {
|
|
double d;
|
|
~B() {}
|
|
};
|
|
|
|
// AIX32: %call = call noalias noundef nonnull ptr @_Znam(i32 noundef 8)
|
|
// AIX64: %call = call noalias noundef nonnull ptr @_Znam(i64 noundef 8)
|
|
B *allocBp() { return new B[0]; }
|
|
|
|
// AIX-LABEL: delete.notnull:
|
|
// AIX32: %0 = getelementptr inbounds i8, ptr %call, i32 -8
|
|
// AIX32: [[PTR:%.+]] = getelementptr inbounds i8, ptr %0, i32 4
|
|
// AIX64: [[PTR:%.+]] = getelementptr inbounds i8, ptr %call, i64 -8
|
|
// AIX: %{{.+}} = load i{{[0-9]+}}, ptr [[PTR]]
|
|
void bar() { delete[] allocBp(); }
|
|
|
|
typedef struct D {
|
|
double d;
|
|
int i;
|
|
|
|
~D(){};
|
|
} D;
|
|
|
|
// AIX: define void @_Z3foo1D(ptr dead_on_unwind noalias writable sret(%struct.D) align 4 %agg.result, ptr noundef %x)
|
|
// AIX32 call void @llvm.memcpy.p0.p0.i32(ptr align 4 %agg.result, ptr align 4 %x, i32 16, i1 false)
|
|
// AIX64: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %agg.result, ptr align 4 %x, i64 16, i1 false)
|
|
D foo(D x) { return x; }
|