http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57624
Bug ID: 57624
Summary: BZHI instrinsic is missing
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sgunderson at bigfoot dot com
Hi,
The GCC documentation
(http://gcc.gnu.org/onlinedocs/gcc/X86-Built_002din-Functions.html) claims
there should be such an intrinsic, added in gcc 4.7:
unsigned long long _bzhi_u64 (unsigned long long, unsigned long long)
Yet, with gcc 4.8.1 (Debian 4.8.1-2), nothing of the sort exists:
sesse@gruessi:~$ gcc-4.8 -Wall -O2 -mbmi2 -c bzhi-test.c
bzhi-test.c: In function ‘func’:
bzhi-test.c:5:2: warning: implicit declaration of function ‘_bzhi_u64’
[-Wimplicit-function-declaration]
return _bzhi_u64(x, y);
^
A function call is generated instead, which was obviously not what I intended.
:-)
I thought this was maybe just a documentation error, but
__builtin_ia32_bzhi_u64 also does not exist.
