--- Comment #5 from jv244 at cam dot ac dot uk 2008-01-08 09:52 ---
updated the summary after the analysis in comment #4, and and CCed Dorit for
the vectorization issue.
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jv244 at cam dot ac dot uk changed:
What|Removed |Added
---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079
Richard Biener changed:
What|Removed |Added
Status|NEW |RESOLVED
Known to work|
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079
--- Comment #14 from Richard Guenther 2012-07-18
13:28:41 UTC ---
Smart again - with stock trunk I get everything optimized away ;)
--- Comment #6 from rguenth at gcc dot gnu dot org 2008-08-18 15:20 ---
The problem for the GCC vectorizer is that there are no loads or stores left
in the loop and it doesn't handle vectorizing "registers" only. This is a
case where real vectorization of straight-line code would be nec
--- Comment #7 from rguenth at gcc dot gnu dot org 2008-08-18 15:22 ---
That is, GCCs inner loop is
.L6:
addl$1, %eax
addsd %xmm12, %xmm11
cmpl$1, %eax
addsd %xmm14, %xmm3
addsd %xmm15, %xmm2
addsd %xmm13, %xmm1
--- Comment #8 from jv244 at cam dot ac dot uk 2008-08-19 05:43 ---
(In reply to comment #7)
> That is, GCCs inner loop is
>
> .L6:
> addl$1, %eax
> addsd %xmm12, %xmm11
> cmpl$1, %eax
> addsd %xmm14, %xmm3
> addsd %xmm15, %x
--- Comment #9 from jv244 at cam dot ac dot uk 2008-08-19 05:44 ---
Created an attachment (id=16093)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16093&action=view)
comment #0 source
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079
--- Comment #10 from jv244 at cam dot ac dot uk 2008-08-19 05:45 ---
Created an attachment (id=16094)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16094&action=view)
comment #0 intel's assembly (ifort 9.1 at -O2 -xT)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079
--- Comment #11 from jv244 at cam dot ac dot uk 2008-08-19 06:09 ---
Created an attachment (id=16095)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16095&action=view)
new testcase
This (PR31079_11.f90) should be a replacement for comment #4, and illustrates
the vectorizer issue.
--- Comment #12 from jv244 at cam dot ac dot uk 2008-08-19 06:11 ---
Created an attachment (id=16096)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16096&action=view)
ifort's asm for PR31079_11.f90 at -O3 -xT -S
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079
--- Comment #13 from jv244 at cam dot ac dot uk 2008-08-19 13:31 ---
(In reply to comment #11)
> This (PR31079_11.f90) should be a replacement for comment #4, and illustrates
> the vectorizer issue.
The patch Richard posted in PR37150 also improves this PR31079_11.f90 testcase
a lot:
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