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* [Bug c++/59071] New: sse2 intrinsics and constant expressions
@ 2013-11-10 20:05 vermaelen.wouter at gmail dot com
2013-11-11 15:44 ` [Bug c++/59071] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: vermaelen.wouter at gmail dot com @ 2013-11-10 20:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59071
Bug ID: 59071
Summary: sse2 intrinsics and constant expressions
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vermaelen.wouter at gmail dot com
gcc-4.8.2 with -O0 rejects the following code. With -O1 it works fine. Gcc-4.6,
4.7 and clang also work fine. I *believe* the stuff below is a constant
expression, so it should compile (even without optimizations enabled).
-------
#include "emmintrin.h"
template<int N> __m128i foo(__m128i x) {
return _mm_slli_si128(x, sizeof(__m128i) - N);
}
void bar(__m128i x) { foo<4>(x); }
--------
> g++ test.cc
In file included from test.cc:1:0:
test.cc: In function ‘__m128i foo(__m128i) [with int N = 4; __m128i =
__vector(2) long long int]’:
test.cc:4:9: error: the last argument must be an 8-bit immediate
return _mm_slli_si128(x, sizeof(__m128i) - N);
>From gcc-bugs-return-434206-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Nov 10 20:09:42 2013
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/50643] Suppress cc1: warnings being treated as errors
Date: Sun, 10 Nov 2013 20:09:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idP643
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |4.8.0
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In GCC 4.8.0 and above, it shows what option enabled the error (in most cases)
including the warning option that enabled it.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/59071] sse2 intrinsics and constant expressions
2013-11-10 20:05 [Bug c++/59071] New: sse2 intrinsics and constant expressions vermaelen.wouter at gmail dot com
@ 2013-11-11 15:44 ` rguenth at gcc dot gnu.org
2014-03-16 10:45 ` mark.j.abraham at gmail dot com
2014-03-16 19:58 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-11 15:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59071
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2013-11-11
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/59071] sse2 intrinsics and constant expressions
2013-11-10 20:05 [Bug c++/59071] New: sse2 intrinsics and constant expressions vermaelen.wouter at gmail dot com
2013-11-11 15:44 ` [Bug c++/59071] " rguenth at gcc dot gnu.org
@ 2014-03-16 10:45 ` mark.j.abraham at gmail dot com
2014-03-16 19:58 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mark.j.abraham at gmail dot com @ 2014-03-16 10:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59071
Mark Abraham <mark.j.abraham at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mark.j.abraham at gmail dot com
--- Comment #2 from Mark Abraham <mark.j.abraham at gmail dot com> ---
The same error message with 4.8.2 is provoked by
_mm_srli_si128((x), sizeof(int) * (i))
and is fixed by
_mm_srli_si128((x), 4 * (i))
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/59071] sse2 intrinsics and constant expressions
2013-11-10 20:05 [Bug c++/59071] New: sse2 intrinsics and constant expressions vermaelen.wouter at gmail dot com
2013-11-11 15:44 ` [Bug c++/59071] " rguenth at gcc dot gnu.org
2014-03-16 10:45 ` mark.j.abraham at gmail dot com
@ 2014-03-16 19:58 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-03-16 19:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59071
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You would need constexpr int n = sizeof(__i128i) - N;
to guarantee it is folded into a constant, otherwise there is no guarantee it
will be, it is normal expression and it is purely an optimization issue (which
you've requested not to be performed through -O0) whether it is evaluated as
constant or not.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-03-16 19:58 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-11-10 20:05 [Bug c++/59071] New: sse2 intrinsics and constant expressions vermaelen.wouter at gmail dot com
2013-11-11 15:44 ` [Bug c++/59071] " rguenth at gcc dot gnu.org
2014-03-16 10:45 ` mark.j.abraham at gmail dot com
2014-03-16 19:58 ` jakub at gcc dot gnu.org
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