| Matt Beaumont-Gay | cb18ca2 | 2012-03-15 20:24:29 +0000 | [diff] [blame] | 1 | ; PR12202 |
| 2 | ; RUN: opt < %s -scalarrepl -S |
| 3 | ; Ensure that we do not hang or crash when feeding a negative value to memset |
| 4 | |
| 5 | target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S32" |
| 6 | target triple = "i686-pc-win32" |
| 7 | |
| 8 | define i32 @test() nounwind { |
| 9 | entry: |
| 10 | %retval = alloca i32, align 4 |
| 11 | %buff = alloca [1 x i8], align 1 |
| 12 | store i32 0, i32* %retval |
| 13 | %0 = bitcast [1 x i8]* %buff to i8* |
| 14 | call void @llvm.memset.p0i8.i32(i8* %0, i8 0, i32 1, i32 1, i1 false) |
| 15 | %arraydecay = getelementptr inbounds [1 x i8]* %buff, i32 0, i32 0 |
| 16 | call void @llvm.memset.p0i8.i32(i8* %arraydecay, i8 -1, i32 -8, i32 1, i1 false) ; Negative 8! |
| 17 | ret i32 0 |
| 18 | } |
| 19 | |
| 20 | declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind |