| // RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s |
| |
| // PR6805 |
| // CHECK: @foo |
| void foo() { |
| union { int i; } u; |
| // CHECK: objectsize |
| // CHECK: icmp uge |
| u.i=1; |
| } |
| |
| // CHECK: @bar |
| int bar(int *a) { |
| // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4 |
| |
| // CHECK: %[[PTRINT:.*]] = ptrtoint |
| // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3 |
| // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| return *a; |
| } |
| |
| // CHECK: @lsh_overflow |
| int lsh_overflow(int a, int b) { |
| // CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31 |
| // CHECK-NEXT: br i1 %[[INBOUNDS]] |
| |
| // CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]] |
| // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]] |
| // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0 |
| // CHECK-NEXT: br i1 %[[NO_OVERFLOW]] |
| |
| // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]] |
| // CHECK-NEXT: ret i32 %[[RET]] |
| return a << b; |
| } |
| |
| // CHECK: @rsh_inbounds |
| int rsh_inbounds(int a, int b) { |
| // CHECK: %[[INBOUNDS:.*]] = icmp ult i32 %[[RHS:.*]], 32 |
| // CHECK: br i1 %[[INBOUNDS]] |
| |
| // CHECK: %[[RET:.*]] = ashr i32 %[[LHS]], %[[RHS]] |
| // CHECK-NEXT: ret i32 %[[RET]] |
| return a >> b; |
| } |
