public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/39069] New: signed short plus and signed char plus not vectorized
@ 2009-02-01 20:35 dann at godzilla dot ics dot uci dot edu
2009-02-01 20:50 ` [Bug tree-optimization/39069] " rguenth at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: dann at godzilla dot ics dot uci dot edu @ 2009-02-01 20:35 UTC (permalink / raw)
To: gcc-bugs
gcc -march=core2 -O3 -ftree-vectorizer-verbose=6
for this code:
#define SIZE 10000
signed short a[SIZE];
signed short b[SIZE];
signed short c[SIZE];
void add()
{
int i;
for (i = 0; i < SIZE; ++i)
a[i] = b[i] + c[i];
}
cannot vectorize the loop:
add_sshort.c:9: note: vect_model_load_cost: aligned.
add_sshort.c:9: note: vect_model_load_cost: inside_cost = 1, outside_cost = 0 .
add_sshort.c:9: note: not vectorized: relevant stmt not supported: D.1580_6 =
(short unsigned int) D.1579_5
add_sshort.c:7: note: vectorized 0 loops in function.
The same happens if the type for a,b and c is "signed char".
But if the type is "unsigned short" or "unsigned char" the loop is vectorized.
--
Summary: signed short plus and signed char plus not vectorized
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dann at godzilla dot ics dot uci dot edu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39069
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/39069] signed short plus and signed char plus not vectorized
2009-02-01 20:35 [Bug tree-optimization/39069] New: signed short plus and signed char plus not vectorized dann at godzilla dot ics dot uci dot edu
@ 2009-02-01 20:50 ` rguenth at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-02-01 20:50 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-02-01 20:50 -------
*** This bug has been marked as a duplicate of 39068 ***
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39069
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2009-02-01 20:50 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-02-01 20:35 [Bug tree-optimization/39069] New: signed short plus and signed char plus not vectorized dann at godzilla dot ics dot uci dot edu
2009-02-01 20:50 ` [Bug tree-optimization/39069] " rguenth at gcc dot gnu dot org
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).