51 lines · c
1// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py2/// Check that the alignment builtins handle array-to-pointer decay3// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -o - -emit-llvm %s | FileCheck %s4 5extern int func(char *c);6 7// CHECK-LABEL: @test_array(8// CHECK-NEXT: entry:9// CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 1610// CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 4411// CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[ARRAYIDX]], i64 -16)12// CHECK-NEXT: [[CALL:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT]])13// CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 2214// CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = getelementptr inbounds i8, ptr [[ARRAYIDX1]], i64 3115// CHECK-NEXT: [[ALIGNED_RESULT2:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[OVER_BOUNDARY]], i64 -32)16// CHECK-NEXT: [[CALL3:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT2]])17// CHECK-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 1618// CHECK-NEXT: [[SRC_ADDR:%.*]] = ptrtoint ptr [[ARRAYIDX4]] to i6419// CHECK-NEXT: [[SET_BITS:%.*]] = and i64 [[SRC_ADDR]], 6320// CHECK-NEXT: [[IS_ALIGNED:%.*]] = icmp eq i64 [[SET_BITS]], 021// CHECK-NEXT: [[CONV:%.*]] = zext i1 [[IS_ALIGNED]] to i3222// CHECK-NEXT: ret i32 [[CONV]]23//24int test_array(void) {25 char buf[1024];26 func(__builtin_align_down(&buf[44], 16));27 func(__builtin_align_up(&buf[22], 32));28 return __builtin_is_aligned(&buf[16], 64);29}30 31// CHECK-LABEL: @test_array_should_not_mask(32// CHECK-NEXT: entry:33// CHECK-NEXT: [[BUF:%.*]] = alloca [1024 x i8], align 3234// CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 6435// CHECK-NEXT: [[ALIGNED_RESULT:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[ARRAYIDX]], i64 -16)36// CHECK-NEXT: [[CALL:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT]])37// CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [1024 x i8], ptr [[BUF]], i64 0, i64 3238// CHECK-NEXT: [[OVER_BOUNDARY:%.*]] = getelementptr inbounds i8, ptr [[ARRAYIDX1]], i64 3139// CHECK-NEXT: [[ALIGNED_RESULT2:%.*]] = call ptr @llvm.ptrmask.p0.i64(ptr [[OVER_BOUNDARY]], i64 -32)40// CHECK-NEXT: [[CALL3:%.*]] = call i32 @func(ptr noundef [[ALIGNED_RESULT2]])41// CHECK-NEXT: ret i32 142//43int test_array_should_not_mask(void) {44 _Alignas(32) char buf[1024];45 // TODO: The align_up and align_down calls should be folded to no-ops46 func(__builtin_align_down(&buf[64], 16));47 func(__builtin_align_up(&buf[32], 32));48 // This expression can be constant-evaluated:49 return __builtin_is_aligned(&buf[64], 32);50}51