| Nick Lewycky | ca55ee0 | 2009-10-14 19:02:13 +0000 | [diff] [blame] | 1 | ; RUN: opt -gvn -instcombine -S < %s | FileCheck %s |
| Nick Lewycky | 5c9be67 | 2009-10-13 07:48:38 +0000 | [diff] [blame] | 2 | |
| 3 | declare i8 @llvm.atomic.load.add.i8.p0i8(i8*, i8) |
| 4 | |
| Nick Lewycky | ca55ee0 | 2009-10-14 19:02:13 +0000 | [diff] [blame] | 5 | define i8 @foo(i8* %ptr) { |
| Nick Lewycky | 5c9be67 | 2009-10-13 07:48:38 +0000 | [diff] [blame] | 6 | %P = getelementptr i8* %ptr, i32 0 |
| 7 | %Q = getelementptr i8* %ptr, i32 1 |
| 8 | ; CHECK: getelementptr |
| 9 | %X = load i8* %P |
| Nick Lewycky | 5c9be67 | 2009-10-13 07:48:38 +0000 | [diff] [blame] | 10 | %Y = call i8 @llvm.atomic.load.add.i8.p0i8(i8* %Q, i8 1) |
| 11 | %Z = load i8* %P |
| 12 | ; CHECK-NOT: = load |
| Nick Lewycky | ca55ee0 | 2009-10-14 19:02:13 +0000 | [diff] [blame] | 13 | %A = sub i8 %X, %Z |
| 14 | ret i8 %A |
| 15 | ; CHECK: ret i8 0 |
| Nick Lewycky | 5c9be67 | 2009-10-13 07:48:38 +0000 | [diff] [blame] | 16 | } |