https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110921
Bug ID: 110921
Summary: Relax _tzcnt_u32 support x86, all x86 arch support for
this instrunction
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: luoyonggang at gmail dot com
Target Milestone: ---
Created attachment 55695
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55695&action=edit
A patch for fixes this issue in a brute way, just for demo
The compiling error:
In file included from
C:/CI-Tools/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/x86gprintrin.h:41,
from
C:/CI-Tools/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/x86intrin.h:27,
from C:/CI-Tools/msys64/mingw64/include/intrin.h:69,
from ../../src/amd/addrlib/src/core/addrcommon.h:33,
from ../../src/amd/addrlib/src/core/addrobject.h:21,
from ../../src/amd/addrlib/src/core/addrlib.h:21,
from ../../src/amd/addrlib/src/core/addrlib2.h:20,
from ../../src/amd/addrlib/src/gfx10/gfx10addrlib.h:19,
from ../../src/amd/addrlib/src/gfx10/gfx10addrlib.cpp:16:
C:/CI-Tools/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/bmiintrin.h:
In function 'unsigned int Addr::BitScanForward(unsigned int)':
C:/CI-Tools/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/bmiintrin.h:116:1:
error: inlining failed in call to 'always_inline' 'unsigned int
_tzcnt_u32(unsigned int)': target specific option mismatch
116 | _tzcnt_u32 (unsigned int __X)
| ^~~~~~~~~~
../../src/amd/addrlib/src/core/addrcommon.h:343:23: note: called from here
343 | out = ::_tzcnt_u32(mask);
| ~~~~~~~~~~~~^~~~~~
[113/1111] Compiling C++ object
src/amd/compiler/libaco.a.p/aco_insert_NOPs.cpp.obj
This code can be compiled with MSVC and Clang.
Reason:
Since the TZCNT instruction behaves as BSF on non-BMI targets, there is code
that expects
to use it as a potentially faster version of BSF.
This is for alignment with Clang and MSVC.
Also the _mm_tzcnt_32 and _mm_tzcnt_64 are added for consistence with Clang and
MSVC
