https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71777
Bug ID: 71777
Summary: __builtin_cpu_supports() doesn't work on powerpc
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mathieu.malaterre at gmail dot com
Target Milestone: ---
Created attachment 38839
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38839&action=edit
demo code
I've been trying to test __builtin_cpu_supports on PowerPC (ppc32 and ppc64),
as per documentation:
https://gcc.gnu.org/onlinedocs/gcc-6.1.0/gcc/PowerPC-Built-in-Functions.html#PowerPC-Built-in-Functions
However the attached code never returns a value of 1, 0 is always returned.
No warning/errors were shown when compiling it with:
% gcc-6 -O3 -m32 -o cpu32 cpu.c && ./cpu32
or
% gcc-6 -O3 -m64 -o cpu64 cpu.c && ./cpu64
ref:
% gcc-6 --version
gcc-6 (Debian 6.1.1-8) 6.1.1 20160630
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
malat@pizzetti ~ % cat /proc/cpuinfo
processor : 0
cpu : POWER8E (raw), altivec supported
clock : 3425.000000MHz
revision : 2.1 (pvr 004b 0201)
processor : 1
cpu : POWER8E (raw), altivec supported
clock : 3425.000000MHz
revision : 2.1 (pvr 004b 0201)
processor : 2
cpu : POWER8E (raw), altivec supported
clock : 3425.000000MHz
revision : 2.1 (pvr 004b 0201)
processor : 3
cpu : POWER8E (raw), altivec supported
clock : 3425.000000MHz
revision : 2.1 (pvr 004b 0201)
timebase : 512000000
platform : pSeries
model : IBM pSeries (emulated by qemu)
machine : CHRP IBM pSeries (emulated by qemu)
as well as:
malat@partch ~ % cat /proc/cpuinfo
processor : 0
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 1
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 2
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 3
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 4
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 5
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 6
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
processor : 7
cpu : POWER7 (architected), altivec supported
clock : 3550.000000MHz
revision : 2.1 (pvr 003f 0201)
timebase : 512000000
platform : pSeries
model : IBM,8231-E2B
machine : CHRP IBM,8231-E2B
