| Issue |
127177
|
| Summary |
[SLPVectorizer] Miscompilation at O2
|
| Labels |
miscompilation,
llvm:SLPVectorizer,
generated by fuzzer
|
| Assignees |
|
| Reporter |
dtcxzyw
|
Reproducer:
```
; bin/opt -passes=slp-vectorizer test.ll -S
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i8 @test() {
entry:
%inc.1.i.i = zext i1 false to i8
%inc.2.i.i = zext i1 false to i8
%inc.3.i.i = zext i1 false to i8
%inc.6.i.i = zext i1 false to i8
%inc.7.i.i = zext i1 false to i8
%inc.8.i.i = zext i1 false to i8
%inc.10.i.i = zext i1 false to i8
%inc.11.i.i = zext i1 false to i8
%inc.12.i.i = zext i1 true to i8
%inc.13.i.i = zext i1 false to i8
%inc.14.i.i = zext i1 false to i8
%inc.15.i.i = zext i1 false to i8
%inc9.1.i.i = add i8 %inc.2.i.i, %inc.1.i.i
%inc9.2.i.i = add i8 %inc9.1.i.i, %inc.3.i.i
%spec.select17.i.i = add i8 %inc9.2.i.i, %inc.6.i.i
%spec.select18.i.i = add i8 %spec.select17.i.i, %inc.7.i.i
%spec.select19.i.i = add i8 %spec.select18.i.i, %inc.8.i.i
%spec.select21.i.i = add i8 %spec.select19.i.i, %inc.10.i.i
%spec.select22.i.i = add i8 %spec.select21.i.i, %inc.11.i.i
%spec.select23.i.i = add i8 %spec.select22.i.i, %inc.12.i.i
%spec.select24.i.i = add i8 %spec.select23.i.i, %inc.13.i.i
%spec.select25.i.i = add i8 %spec.select24.i.i, %inc.14.i.i
%spec.select26.i.i = add i8 %spec.select25.i.i, %inc.15.i.i
ret i8 %spec.select26.i.i
}
```
Output:
```
define i8 @test() {
entry:
%0 = call i12 @llvm.ctpop.i12(i12 0)
%1 = trunc i12 %0 to i8
ret i8 %1
}
```
The correct return value is 1.
llvm version: 8a0914c24530c98c5ff65bce3710552ce3ebf7d7
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