| // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsanitize=unsigned-shift-base,shift-exponent %s -emit-llvm -o - | FileCheck %s |
| |
| // CHECK-LABEL: lsh_overflow( |
| unsigned lsh_overflow(unsigned a, unsigned b) { |
| // CHECK: %[[RHS_INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31 |
| // CHECK-NEXT: br i1 %[[RHS_INBOUNDS]], label %[[CHECK_BB:.*]], label %[[CONT_BB:.*]], |
| |
| // CHECK: [[CHECK_BB]]: |
| // CHECK-NEXT: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]] |
| // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]] |
| |
| // CHECK-NEXT: %[[SHIFTED_OUT_NOT_SIGN:.*]] = lshr i32 %[[SHIFTED_OUT]], 1 |
| |
| // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT_NOT_SIGN]], 0 |
| // CHECK-NEXT: br label %[[CONT_BB]] |
| |
| // CHECK: [[CONT_BB]]: |
| // CHECK-NEXT: %[[VALID_BASE:.*]] = phi i1 [ true, {{.*}} ], [ %[[NO_OVERFLOW]], %[[CHECK_BB]] ] |
| // CHECK-NEXT: %[[VALID:.*]] = and i1 %[[RHS_INBOUNDS]], %[[VALID_BASE]] |
| // CHECK-NEXT: br i1 %[[VALID]] |
| |
| // CHECK: call void @__ubsan_handle_shift_out_of_bounds |
| // CHECK-NOT: call void @__ubsan_handle_shift_out_of_bounds |
| |
| // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]] |
| // CHECK-NEXT: ret i32 %[[RET]] |
| return a << b; |
| } |
