https://llvm.org/bugs/show_bug.cgi?id=31731
Bug ID: 31731
Summary: -mavx512bw produces wrong code for greater/less than
Product: clang
Version: 3.9
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: l...@marehr.dialup.fu-berlin.de
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17886
--> https://llvm.org/bugs/attachment.cgi?id=17886&action=edit
simd_bug.cpp
Hi,
the attached source code works fine with:
```
clang++-3.9 -g -std=c++14 -O3 -mavx512f -mavx512cd -o avx512_knl
sde -skx -- ./avx512_knl
```
outputs
```
8: 21 < or > 24 => -1 0
9: 24 < or > 23 => 0 -1
```
```
but with
```
clang++-3.9 -g -std=c++14 -O3 -mavx512f -mavx512cd -mavx512bw -o avx512
sde -skx -- ./avx512
```
outputs
```
8: 21 < or > 24 => -1 0
9: 24 < or > 23 => -1 0
```
which is not correct. The error could be due to sde, that it simulates the
instructions wrong, or the code generation of clang is wrong.
Versions:
```
clang-3.9 --version
clang version 3.9.1-svn288847-1~exp1 (branches/release_39)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
sde --version
Intel(R) Software Development Emulator. Version: 7.49.0 external
Copyright (C) 2008-2016, Intel Corporation. All rights reserved
```
Thank you for your help.
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