| Issue |
75944
|
| Summary |
[llc] Signed Overflow detected by UBSan.
|
| Labels |
bug,
backend:X86
|
| Assignees |
|
| Reporter |
Ralender
|
```ll
target datalayout = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386-unknown-linux-gnu"
define void @test(ptr %0) {
%2 = alloca [10 x i8], i32 0, align 1
%3 = ptrtoint ptr %2 to i32
%4 = add i32 %3, 2147483647
br label %5
5: ; preds = %5, %1
%6 = phi i32 [ 0, %1 ], [ %7, %5 ]
%7 = add i32 %6, 1
%8 = icmp eq i32 %6, %4
br label %5
]
```
```bash
> llc out.ll
.../llvm-project/llvm/lib/Target/X86/X86RegisterInfo.cpp:945:27: runtime error: signed integer overflow: 3 + 2147483647 cannot be represented in type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior .../llvm-project/llvm/lib/Target/X86/X86RegisterInfo.cpp:945:27 in
```
I can reproduce this on f17e76697289e6a54e89298a49f12b6799dd3e1a
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