29 lines · c
1// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsanitize=unsigned-shift-base,shift-exponent %s -emit-llvm -o - | FileCheck %s2 3// CHECK-LABEL: lsh_overflow(4unsigned lsh_overflow(unsigned a, unsigned b) {5 // CHECK: %[[RHS_INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 316 // CHECK-NEXT: br i1 %[[RHS_INBOUNDS]], label %[[CHECK_BB:.*]], label %[[CONT_BB:.*]],7 8 // CHECK: [[CHECK_BB]]:9 // CHECK-NEXT: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]10 // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]11 12 // CHECK-NEXT: %[[SHIFTED_OUT_NOT_SIGN:.*]] = lshr i32 %[[SHIFTED_OUT]], 113 14 // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT_NOT_SIGN]], 015 // CHECK-NEXT: br label %[[CONT_BB]]16 17 // CHECK: [[CONT_BB]]:18 // CHECK-NEXT: %[[VALID_BASE:.*]] = phi i1 [ true, {{.*}} ], [ %[[NO_OVERFLOW]], %[[CHECK_BB]] ]19 // CHECK-NEXT: %[[VALID:.*]] = and i1 %[[RHS_INBOUNDS]], %[[VALID_BASE]]20 // CHECK-NEXT: br i1 %[[VALID]]21 22 // CHECK: call void @__ubsan_handle_shift_out_of_bounds23 // CHECK-NOT: call void @__ubsan_handle_shift_out_of_bounds24 25 // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]26 // CHECK-NEXT: ret i32 %[[RET]]27 return a << b;28}29