https://llvm.org/bugs/show_bug.cgi?id=25544
Bug ID: 25544
Summary: clang-cl can't use _tzcnt_u32
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: h...@chromium.org
CC: echri...@gmail.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Example:
unsigned f(unsigned x) {
return __tzcnt_u32(x);
}
bin\clang-cl -c /FIIntrin.h d:\src\tmp\a.c
a.c(2,10) : error: always_inline function '__tzcnt_u32' requires
target feature 'bmi', but would be inlined into function 'f' that is
compiled without support for 'bmi'
return __tzcnt_u32(x);
^
I think the problem is that on non-Windows we only expose these intrinsics when
BMI instructions are available on the target, but with MSVC they're always
exposed and emulated as necessary.
(This started showing up recently in Chromium after an ffmpeg update.)
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