clang/test/CodeGenObjC/bitfield-access.m

// RUN: %clang_cc1 -triple i386-apple-darwin10 -fobjc-runtime=macosx-fragile-10.5 -emit-llvm -o %t1 %s
// RUN: FileCheck -check-prefix=CHECK-I386 < %t1 %s

// RUN: %clang_cc1 -triple armv6-apple-darwin10 -fobjc-runtime=macosx-fragile-10.5 -target-abi apcs-gnu -emit-llvm -o %t2 %s
// RUN: FileCheck -check-prefix=CHECK-ARM < %t2 %s

@interface I0 { 
@public
    unsigned x:15;
    unsigned y: 1;
} 
@end

// Check that we don't try to use an i32 load here, which would reach beyond the
// end of the structure.
//
// CHECK-I386-LABEL: define{{.*}} i32 @f0(
// CHECK-I386:   [[t0_0:%.*]] = load i8, ptr {{.*}}, align 1
// CHECK-I386:   lshr i8 [[t0_0]], 7
// CHECK-I386: }
int f0(I0 *a) {
  return a->y;
}

// Check that we can handled straddled loads.
//
// CHECK-ARM-LABEL: define{{.*}} i32 @f1(
// CHECK-ARM:    [[t1_ptr:%.*]] = getelementptr
// CHECK-ARM:    [[t1_0:%.*]] = load i40, ptr [[t1_ptr]], align 1
// CHECK-ARM:    [[t1_1:%.*]] = lshr i40 [[t1_0]], 1
// CHECK-ARM:    [[t1_2:%.*]] = and i40 [[t1_1]],
// CHECK-ARM:                   trunc i40 [[t1_2]] to i32
// CHECK-ARM: }
@interface I1 {
@public
    unsigned x: 1;
    unsigned y:32;
}
@end

int f1(I1 *a) { return a->y; }