| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -dse < %s | FileCheck %s |
| 2 | |
| 3 | declare void @llvm.memcpy.i8(i8*, i8*, i8, i32) |
| 4 | declare void @llvm.memmove.i8(i8*, i8*, i8, i32) |
| 5 | declare void @llvm.memset.i8(i8*, i8, i8, i32) |
| 6 | |
| 7 | define void @test1() { |
| 8 | ; CHECK: @test1 |
| 9 | %A = alloca i8 |
| 10 | %B = alloca i8 |
| 11 | |
| 12 | store i8 0, i8* %A ;; Written to by memcpy |
| 13 | ; CHECK-NOT: store |
| 14 | |
| 15 | call void @llvm.memcpy.i8(i8* %A, i8* %B, i8 -1, i32 0) |
| 16 | |
| 17 | ret void |
| 18 | ; CHECK: ret void |
| 19 | } |
| 20 | |
| 21 | define void @test2() { |
| 22 | ; CHECK: @test2 |
| 23 | %A = alloca i8 |
| 24 | %B = alloca i8 |
| 25 | |
| 26 | store i8 0, i8* %A ;; Written to by memmove |
| 27 | ; CHECK-NOT: store |
| 28 | |
| 29 | call void @llvm.memmove.i8(i8* %A, i8* %B, i8 -1, i32 0) |
| 30 | |
| 31 | ret void |
| 32 | ; CHECK: ret void |
| 33 | } |
| 34 | |
| 35 | define void @test3() { |
| 36 | ; CHECK: @test3 |
| 37 | %A = alloca i8 |
| 38 | %B = alloca i8 |
| 39 | |
| 40 | store i8 0, i8* %A ;; Written to by memset |
| 41 | ; CHECK-NOT: store |
| 42 | |
| 43 | call void @llvm.memset.i8(i8* %A, i8 0, i8 -1, i32 0) |
| 44 | |
| 45 | ret void |
| 46 | ; CHECK: ret void |
| 47 | } |