efcda54794
Let Clang emit `llvm.tbaa.errno` metadata in order to let LLVM carry out optimizations around errno-writing libcalls to, as long as it is proved the involved memory location does not alias `errno`. Previous discussion: https://discourse.llvm.org/t/rfc-modelling-errno-memory-effects/82972.
36 lines
1.6 KiB
C++
36 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple aarch64_be-apple-darwin -emit-llvm -o - -O1 %s | \
|
|
// RUN: FileCheck -check-prefixes=CHECK %s
|
|
// RUN: %clang_cc1 -triple aarch64-apple-darwin -emit-llvm -o - -O1 %s | \
|
|
// RUN: FileCheck -check-prefixes=CHECK %s
|
|
//
|
|
// Check that TBAA metadata for structs containing bitfields is
|
|
// consistent between big and little endian layouts.
|
|
|
|
struct NamedBitfields {
|
|
int f1 : 8;
|
|
int f2 : 8;
|
|
unsigned f3 : 1;
|
|
unsigned f4 : 15;
|
|
int f5;
|
|
double f6;
|
|
};
|
|
|
|
// CHECK-LABEL: _Z4copyP14NamedBitfieldsS0_
|
|
// CHECK-SAME: ptr noundef writeonly captures(none) initializes((0, 16)) [[A1:%.*]], ptr noundef readonly captures(none) [[A2:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
|
|
// CHECK-NEXT: entry:
|
|
// CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) [[A1]], ptr noundef nonnull align 8 dereferenceable(16) [[A2]], i64 16, i1 false), !tbaa.struct [[TBAA_STRUCT6:![0-9]+]]
|
|
// CHECK-NEXT: ret void
|
|
//
|
|
void copy(NamedBitfields *a1, NamedBitfields *a2) {
|
|
*a1 = *a2;
|
|
}
|
|
|
|
// CHECK: [[META2:![0-9]+]] = !{[[META3:![0-9]+]], [[META3]], i64 0}
|
|
// CHECK: [[META3]] = !{!"int", [[META4:![0-9]+]], i64 0}
|
|
// CHECK: [[META4]] = !{!"omnipotent char", [[META5:![0-9]+]], i64 0}
|
|
// CHECK: [[META5]] = !{!"Simple C++ TBAA"}
|
|
// CHECK: [[TBAA_STRUCT6]] = !{i64 0, i64 4, [[META7:![0-9]+]], i64 4, i64 4, [[META2:![0-9]+]], i64 8, i64 8, [[META8:![0-9]+]]}
|
|
// CHECK: [[META7]] = !{[[META4:![0-9]+]], [[META4]], i64 0}
|
|
// CHECK: [[META8]] = !{[[META9:![0-9]+]], [[META9]], i64 0}
|
|
// CHECK: [[META9]] = !{!"double", [[META4]], i64 0}
|