http://llvm.org/bugs/show_bug.cgi?id=19416
Bug ID: 19416
Summary: Clang cannot do LTO with BMI2 instructions
Product: clang
Version: 3.4
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12368
--> http://llvm.org/bugs/attachment.cgi?id=12368&action=edit
Test file with a BMI2 instruction.
Overview:
Clang cannot do LTO (link time optimization) when there are BMI2 instructions
in the file.
Steps to reproduce:
0. Make sure you have an Intel Haswell processor.
1. Create a simple C program (such as the one attached) that contains a BMI2
intrinsic such as _pext_u32(). Be sure to include <x86intrin.h>.
2. Compile using command: clang -mbmi2 file_name.c
3. Compile using command: clang -mbmi2 -flto file_name.c
Actual results:
Compiling without LTO works great. Compiling using LTO crashes with this error:
LLVM ERROR: Cannot select: intrinsic %llvm.x86.bmi.pext.32
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Expected results:
Clang should be able to compile the file with LTO.
Version:
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix
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