https://bugs.llvm.org/show_bug.cgi?id=49942
Bug ID: 49942
Summary: Loading a vector of i1 loads the wrong value
Product: libraries
Version: 10.0
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Core LLVM classes
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
This program:
```
@useFlag = private global <4 x i1> <i1 true, i1 true, i1 true, i1 true>
define i32 @get(i32 %arg) {
%ld = load <4 x i1>, <4 x i1>* @useFlag
%zx = zext <4 x i1> %ld to <4 x i32>
%ee = extractelement <4 x i32> %zx, i32 %arg
ret i32 %ee
}
define i32 @main() {
%g = call i32 @get(i32 2)
ret i32 %g
}
```
will return 0. I'd expect it to return 1 since it should load i1 true and then
zext that to i32 1.
Note that if you `get(i32 0)` then it returns 1 as expected. Also, with -O3
this returns 1 correctly since the load is optimized out.
Tested with:
```
$ clang-10 --version
clang version 10.0.0
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
```
Sorry if this is a duplicate! I found some related notes on lists.llvm.org, but
not a bug report.
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