https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69969
Bug ID: 69969
Summary: [5.3.0 Regression] Function attribute no-vsx
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: cyrilbur at gmail dot com
Target Milestone: ---
Created attachment 37797
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37797&action=edit
preprocessed file
$ powerpc64-buildroot-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/scratch/cyrilb/buildroot/builds/be64/host/usr/bin/powerpc64-buildroot-linux-gnu-gcc.br_real
COLLECT_LTO_WRAPPER=/scratch/cyrilb/buildroot/builds/be64/host/usr/libexec/gcc/powerpc64-buildroot-linux-gnu/5.3.0/lto-wrapper
Target: powerpc64-buildroot-linux-gnu
Configured with: ./configure
--prefix=/scratch/cyrilb/buildroot/builds/be64/host/usr
--sysconfdir=/scratch/cyrilb/buildroot/builds/be64/host/etc --enable-static
--target=powerpc64-buildroot-linux-gnu
--with-sysroot=/scratch/cyrilb/buildroot/builds/be64/host/usr/powerpc64-buildroot-linux-gnu/sysroot
--disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib
--with-gmp=/scratch/cyrilb/buildroot/builds/be64/host/usr
--with-mpfr=/scratch/cyrilb/buildroot/builds/be64/host/usr
--with-pkgversion='Buildroot 2016.02-rc2-00080-gae4daa3'
--with-bugurl=http://bugs.buildroot.net/ --disable-libquadmath --enable-tls
--disable-libmudflap --enable-threads
--with-mpc=/scratch/cyrilb/buildroot/builds/be64/host/usr --without-isl
--without-cloog --disable-decimal-float --with-cpu=power8 --enable-languages=c
--with-build-time-tools=/scratch/cyrilb/buildroot/builds/be64/host/usr/powerpc64-buildroot-linux-gnu/bin
--enable-shared --disable-libgomp --enable-targets=powerpc64-linux
Thread model: posix
gcc version 5.3.0 (Buildroot 2016.02-rc2-00080-gae4daa3)
Cross compiling (x86 host) for PowerPC64
$ powerpc64-buildroot-linux-gnu-gcc no-vsx-test.c -Wall -Wextra -maltivec -mvsx
-save-temps
no-vsx-test.c:7:1: error: -mallow-movmisalign requires -mvsx
{
^
no-vsx-test.c: In function 'main':
no-vsx-test.c:11:14: warning: unused parameter 'argc' [-Wunused-parameter]
int main(int argc, char *argv[])
^
no-vsx-test.c:11:26: warning: unused parameter 'argv' [-Wunused-parameter]
int main(int argc, char *argv[])
^
The issue appears be simply using __attribute__((__target__("no-vsx")))
in order to force the use of Altivec instructions.
Both GCC 4.9.x and 5.2.x (despite having different command line requirements)
will accept this test case and use the correct facility.
