xref: /aosp_15_r20/external/clang/test/CodeGenObjC/bitfield-access.m (revision 67e74705e28f6214e480b399dd47ea732279e315)
1*67e74705SXin Li// RUN: %clang_cc1 -triple i386-apple-darwin10 -fobjc-runtime=macosx-fragile-10.5 -emit-llvm -o %t1 %s
2*67e74705SXin Li// RUN: FileCheck -check-prefix=CHECK-I386 < %t1 %s
3*67e74705SXin Li
4*67e74705SXin Li// RUN: %clang_cc1 -triple armv6-apple-darwin10 -fobjc-runtime=macosx-fragile-10.5 -target-abi apcs-gnu -emit-llvm -o %t2 %s
5*67e74705SXin Li// RUN: FileCheck -check-prefix=CHECK-ARM < %t2 %s
6*67e74705SXin Li
7*67e74705SXin Li@interface I0 {
8*67e74705SXin Li@public
9*67e74705SXin Li    unsigned x:15;
10*67e74705SXin Li    unsigned y: 1;
11*67e74705SXin Li}
12*67e74705SXin Li@end
13*67e74705SXin Li
14*67e74705SXin Li// Check that we don't try to use an i32 load here, which would reach beyond the
15*67e74705SXin Li// end of the structure.
16*67e74705SXin Li//
17*67e74705SXin Li// CHECK-I386-LABEL: define i32 @f0(
18*67e74705SXin Li// CHECK-I386:   [[t0_0:%.*]] = load i8, i8* {{.*}}, align 1
19*67e74705SXin Li// CHECK-I386:   lshr i8 [[t0_0]], 7
20*67e74705SXin Li// CHECK-I386: }
21*67e74705SXin Liint f0(I0 *a) {
22*67e74705SXin Li  return a->y;
23*67e74705SXin Li}
24*67e74705SXin Li
25*67e74705SXin Li// Check that we can handled straddled loads.
26*67e74705SXin Li//
27*67e74705SXin Li// CHECK-ARM-LABEL: define i32 @f1(
28*67e74705SXin Li// CHECK-ARM:    [[t1_ptr:%.*]] = getelementptr
29*67e74705SXin Li// CHECK-ARM:    [[t1_base:%.*]] = bitcast i8* [[t1_ptr]] to i40*
30*67e74705SXin Li// CHECK-ARM:    [[t1_0:%.*]] = load i40, i40* [[t1_base]], align 1
31*67e74705SXin Li// CHECK-ARM:    [[t1_1:%.*]] = lshr i40 [[t1_0]], 1
32*67e74705SXin Li// CHECK-ARM:    [[t1_2:%.*]] = and i40 [[t1_1]],
33*67e74705SXin Li// CHECK-ARM:                   trunc i40 [[t1_2]] to i32
34*67e74705SXin Li// CHECK-ARM: }
35*67e74705SXin Li@interface I1 {
36*67e74705SXin Li@public
37*67e74705SXin Li    unsigned x: 1;
38*67e74705SXin Li    unsigned y:32;
39*67e74705SXin Li}
40*67e74705SXin Li@end
41*67e74705SXin Li
42*67e74705SXin Liint f1(I1 *a) { return a->y; }
43