1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -fno-bitfield-type-align -emit-llvm -o - %s | FileCheck %s 2 3 // CHECK: %[[STRUCT_S:.*]] = type { i32 } 4 5 struct S { 6 unsigned short: 0; 7 unsigned short f1:15; 8 unsigned short: 0; 9 unsigned short f2:15; 10 }; 11 12 // CHECK: define void @test_zero_width_bitfield(%[[STRUCT_S]]* %[[A:.*]]) 13 // CHECK: %[[BF_LOAD:.*]] = load i32, i32* %[[V1:.*]], align 1 14 // CHECK: %[[BF_CLEAR:.*]] = and i32 %[[BF_LOAD]], 32767 15 // CHECK: %[[BF_CAST:.*]] = trunc i32 %[[BF_CLEAR]] to i16 16 // CHECK: %[[CONV:.*]] = zext i16 %[[BF_CAST]] to i32 17 // CHECK: %[[ADD:.*]] = add nsw i32 %[[CONV]], 1 18 // CHECK: %[[CONV1:.*]] = trunc i32 %[[ADD]] to i16 19 // CHECK: %[[V2:.*]] = zext i16 %[[CONV1]] to i32 20 // CHECK: %[[BF_LOAD2:.*]] = load i32, i32* %[[V1]], align 1 21 // CHECK: %[[BF_VALUE:.*]] = and i32 %[[V2]], 32767 22 // CHECK: %[[BF_CLEAR3:.*]] = and i32 %[[BF_LOAD2]], -32768 23 // CHECK: %[[BF_SET:.*]] = or i32 %[[BF_CLEAR3]], %[[BF_VALUE]] 24 // CHECK: store i32 %[[BF_SET]], i32* %[[V1]], align 1 25 26 // CHECK: %[[BF_LOAD4:.*]] = load i32, i32* %[[V4:.*]], align 1 27 // CHECK: %[[BF_LSHR:.*]] = lshr i32 %[[BF_LOAD4]], 15 28 // CHECK: %[[BF_CLEAR5:.*]] = and i32 %[[BF_LSHR]], 32767 29 // CHECK: %[[BF_CAST6:.*]] = trunc i32 %[[BF_CLEAR5]] to i16 30 // CHECK: %[[CONV7:.*]] = zext i16 %[[BF_CAST6]] to i32 31 // CHECK: %[[ADD8:.*]] = add nsw i32 %[[CONV7]], 2 32 // CHECK: %[[CONV9:.*]] = trunc i32 %[[ADD8]] to i16 33 // CHECK: %[[V5:.*]] = zext i16 %[[CONV9]] to i32 34 // CHECK: %[[BF_LOAD10:.*]] = load i32, i32* %[[V4]], align 1 35 // CHECK: %[[BF_VALUE11:.*]] = and i32 %[[V5]], 32767 36 // CHECK: %[[BF_SHL:.*]] = shl i32 %[[BF_VALUE11]], 15 37 // CHECK: %[[BF_CLEAR12:.*]] = and i32 %[[BF_LOAD10]], -1073709057 38 // CHECK: %[[BF_SET13:.*]] = or i32 %[[BF_CLEAR12]], %[[BF_SHL]] 39 // CHECK: store i32 %[[BF_SET13]], i32* %[[V4]], align 1 40 41 void test_zero_width_bitfield(struct S *a) { 42 a->f1 += 1; 43 a->f2 += 2; 44 } 45