llvm-project/clang/test/CodeGen/aggregate-assign-call.c

95 lines
3.3 KiB
C

// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O1 -S -emit-llvm -o - %s | FileCheck %s --check-prefixes=O1
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O0 -S -emit-llvm -o - %s | FileCheck %s --check-prefix=O0
//
// Ensure that we place appropriate lifetime markers around indirectly returned
// temporaries, and that the lifetime.ends appear in a timely manner.
//
// -O1 is used so lifetime markers actually get emitted and optnone is added
// to avoid elimination of lifetime markers by optimizations.
struct S {
int ns[40];
};
struct S foo(void);
// CHECK-LABEL: define dso_local void @bar
__attribute__((optnone))
struct S bar(void) {
// O0-NOT: @llvm.lifetime.start
// O0-NOT: @llvm.lifetime.end
struct S r;
// O1: %[[TMP1_ALLOCA:[^ ]+]] = alloca %struct.S
// O1: %[[TMP2_ALLOCA:[^ ]+]] = alloca %struct.S
// O1: %[[TMP3_ALLOCA:[^ ]+]] = alloca %struct.S
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
// O1: call void @foo
r = foo();
// O1: memcpy
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
// O1: call void @foo
r = foo();
// O1: memcpy
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP3_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
// O1: call void @foo
r = foo();
// O1: memcpy
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP3_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
return r;
}
struct S foo_int(int);
// Be sure that we're placing the lifetime.end so that all paths go through it.
// CHECK-LABEL: define dso_local void @baz
__attribute__((optnone))
struct S baz(int i, volatile int *j) {
// O0-NOT: @llvm.lifetime.start
// O0-NOT: @llvm.lifetime.end
struct S r;
// O1: %[[TMP1_ALLOCA:[^ ]+]] = alloca %struct.S
// O1: %[[TMP2_ALLOCA:[^ ]+]] = alloca %struct.S
do {
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
//
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
//
// O1: call void @foo_int(%struct.S* sret(%struct.S) align 4 %[[TMP1_ALLOCA]],
// O1: call void @llvm.memcpy
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP1_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.start.p0i8({{[^,]*}}, i8* %[[P]])
// O1: call void @foo_int(%struct.S* sret(%struct.S) align 4 %[[TMP2_ALLOCA]],
// O1: call void @llvm.memcpy
// O1: %[[P:[^ ]+]] = bitcast %struct.S* %[[TMP2_ALLOCA]] to i8*
// O1: call void @llvm.lifetime.end.p0i8({{[^,]*}}, i8* %[[P]])
r = foo_int(({
if (*j)
break;
i++;
}));
r = foo_int(i++);
} while (1);
return r;
}