public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug target/67994] New: __attribute__ ((target("arch=XXX"))) enables unsupported ISA
@ 2015-10-16 18:32 hjl.tools at gmail dot com
2015-10-17 13:02 ` [Bug target/67994] " hjl.tools at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2015-10-16 18:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67994
Bug ID: 67994
Summary: __attribute__ ((target("arch=XXX"))) enables
unsupported ISA
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com
Target Milestone: ---
[hjl@gnu-6 pr67985]$ cat r.i
unsigned int
__attribute__ ((target("arch=core2")))
__x86_rdrand(void)
{
unsigned int retries = 100;
unsigned int val;
while (__builtin_ia32_rdrand32_step(&val) == 0)
if (--retries == 0)
return 0;
return val;
}
[hjl@gnu-6 pr67985]$ /export/build/gnu/gcc-test/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-test/build-x86_64-linux/gcc/ -O2 -march=haswell -S -o
r.s r.i
[hjl@gnu-6 pr67985]$ cat r.s
.file "r.i"
.text
.p2align 4,,15
.globl __x86_rdrand
.type __x86_rdrand, @function
__x86_rdrand:
.LFB0:
.cfi_startproc
movl $100, %eax
movl $1, %ecx
jmp .L2
.p2align 4
.L4:
subl $1, %eax
je .L8
.L2:
rdrand %edx
movl %edx, -4(%rsp)
cmovc %ecx, %edx
testl %edx, %edx
je .L4
movl -4(%rsp), %eax
.L8:
ret
.cfi_endproc
.LFE0:
.size __x86_rdrand, .-__x86_rdrand
.ident "GCC: (GNU) 6.0.0 20151016 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 pr67985]$
There should be a warning since rdrand isn't supported on Intel Core 2.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/67994] __attribute__ ((target("arch=XXX"))) enables unsupported ISA
2015-10-16 18:32 [Bug target/67994] New: __attribute__ ((target("arch=XXX"))) enables unsupported ISA hjl.tools at gmail dot com
@ 2015-10-17 13:02 ` hjl.tools at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: hjl.tools at gmail dot com @ 2015-10-17 13:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67994
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
dup
*** This bug has been marked as a duplicate of bug 67995 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2015-10-17 13:02 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-10-16 18:32 [Bug target/67994] New: __attribute__ ((target("arch=XXX"))) enables unsupported ISA hjl.tools at gmail dot com
2015-10-17 13:02 ` [Bug target/67994] " hjl.tools at gmail dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).