| // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py |
| /// Check that the alignment builtins handle array-to-pointer decay |
| // RUN: %clang_cc1 -triple=x86_64-unknown-unknown -o - -emit-llvm %s | FileCheck %s |
| |
| extern int func(char *c); |
| |
| // CHECK-LABEL: @test_array( |
| // CHECK-NEXT: entry: |
| // CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 16 |
| // CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 44 |
| // CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[ARRAYIDX]], i64 -16) |
| // CHECK-NEXT: [[CALL:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT]]) |
| // CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 22 |
| // CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = getelementptr inbounds i8, ptr [[ARRAYIDX1]], i64 31 |
| // CHECK-NEXT: [[ALIGNED_RESULT2:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[OVER_BOUNDARY]], i64 -32) |
| // CHECK-NEXT: [[CALL3:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT2]]) |
| // CHECK-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 16 |
| // CHECK-NEXT: [[SRC_ADDR:%.*]] = ptrtoint ptr [[ARRAYIDX4]] to i64 |
| // CHECK-NEXT: [[SET_BITS:%.*]] = and i64 [[SRC_ADDR]], 63 |
| // CHECK-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 0 |
| // CHECK-NEXT: [[CONV:%.*]] = zext i1 [[IS_ALIGNED]] to i32 |
| // CHECK-NEXT: ret i32 [[CONV]] |
| // |
| int test_array(void) { |
| char buf[1024]; |
| func(__builtin_align_down(&buf[44], 16)); |
| func(__builtin_align_up(&buf[22], 32)); |
| return __builtin_is_aligned(&buf[16], 64); |
| } |
| |
| // CHECK-LABEL: @test_array_should_not_mask( |
| // CHECK-NEXT: entry: |
| // CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 32 |
| // CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 64 |
| // CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[ARRAYIDX]], i64 -16) |
| // CHECK-NEXT: [[CALL:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT]]) |
| // CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 32 |
| // CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = getelementptr inbounds i8, ptr [[ARRAYIDX1]], i64 31 |
| // CHECK-NEXT: [[ALIGNED_RESULT2:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[OVER_BOUNDARY]], i64 -32) |
| // CHECK-NEXT: [[CALL3:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT2]]) |
| // CHECK-NEXT: ret i32 1 |
| // |
| int test_array_should_not_mask(void) { |
| _Alignas(32) char buf[1024]; |
| // TODO: The align_up and align_down calls should be folded to no-ops |
| func(__builtin_align_down(&buf[64], 16)); |
| func(__builtin_align_up(&buf[32], 32)); |
| // This expression can be constant-evaluated: |
| return __builtin_is_aligned(&buf[64], 32); |
| } |