| Richard Smith | 2c9f87c | 2012-08-24 00:54:33 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s |
| Chris Lattner | c24b9c4 | 2010-04-10 18:34:14 +0000 | [diff] [blame] | 2 | |
| 3 | // PR6805 |
| Nuno Lopes | 9eecef1 | 2012-05-07 20:23:03 +0000 | [diff] [blame] | 4 | // CHECK: @foo |
| Chris Lattner | c24b9c4 | 2010-04-10 18:34:14 +0000 | [diff] [blame] | 5 | void foo() { |
| 6 | union { int i; } u; |
| Nuno Lopes | 9eecef1 | 2012-05-07 20:23:03 +0000 | [diff] [blame] | 7 | // CHECK: objectsize |
| Nuno Lopes | 4ccf004 | 2012-05-08 01:54:53 +0000 | [diff] [blame] | 8 | // CHECK: icmp uge |
| Chris Lattner | c24b9c4 | 2010-04-10 18:34:14 +0000 | [diff] [blame] | 9 | u.i=1; |
| 10 | } |
| Nuno Lopes | 9eecef1 | 2012-05-07 20:23:03 +0000 | [diff] [blame] | 11 | |
| 12 | // CHECK: @bar |
| 13 | int bar(int *a) { |
| Richard Smith | 2c9f87c | 2012-08-24 00:54:33 +0000 | [diff] [blame] | 14 | // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| 15 | // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4 |
| 16 | |
| 17 | // CHECK: %[[PTRINT:.*]] = ptrtoint |
| 18 | // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3 |
| 19 | // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| Nuno Lopes | 9eecef1 | 2012-05-07 20:23:03 +0000 | [diff] [blame] | 20 | return *a; |
| 21 | } |
| Richard Smith | 9d3e226 | 2012-08-25 00:32:28 +0000 | [diff] [blame^] | 22 | |
| 23 | // CHECK: @lsh_overflow |
| 24 | int lsh_overflow(int a, int b) { |
| 25 | // CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31 |
| 26 | // CHECK-NEXT: br i1 %[[INBOUNDS]] |
| 27 | |
| 28 | // CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]] |
| 29 | // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]] |
| 30 | // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0 |
| 31 | // CHECK-NEXT: br i1 %[[NO_OVERFLOW]] |
| 32 | |
| 33 | // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]] |
| 34 | // CHECK-NEXT: ret i32 %[[RET]] |
| 35 | return a << b; |
| 36 | } |
| 37 | |
| 38 | // CHECK: @rsh_inbounds |
| 39 | int rsh_inbounds(int a, int b) { |
| 40 | // CHECK: %[[INBOUNDS:.*]] = icmp ult i32 %[[RHS:.*]], 32 |
| 41 | // CHECK: br i1 %[[INBOUNDS]] |
| 42 | |
| 43 | // CHECK: %[[RET:.*]] = ashr i32 %[[LHS]], %[[RHS]] |
| 44 | // CHECK-NEXT: ret i32 %[[RET]] |
| 45 | return a >> b; |
| 46 | } |