https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
Jeffrey A. Law law at redhat dot com changed:
What|Removed |Added
Priority|P3 |P2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #10 from Richard Biener rguenth at gcc dot gnu.org ---
Now that PR64434 was fixed I wonder if fatigue is fast again.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #11 from Dominique d'Humieres dominiq at lps dot ens.fr ---
Now that PR64434 was fixed I wonder if fatigue is fast again.
Unfortunately no.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Status|WAITING |NEW
---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #9 from Richard Biener rguenth at gcc dot gnu.org ---
For r217826 vs. r217827 the assembly differences show a larger stack frame
while the optimized dump differences are net positive (more memory CSE happens
and loads get removed -
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Target|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
Richard Biener rguenth at gcc dot gnu.org changed:
What|Removed |Added
Status|UNCONFIRMED |WAITING
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #2 from Dominique d'Humieres dominiq at lps dot ens.fr ---
I don't see this on any of our testers. What CPU do you have and what default
-march gets used for you? (thus please show -v output)
My CPU is a 2.8 GHz Intel Core i7.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #3 from Richard Biener rguenth at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #2)
I don't see this on any of our testers. What CPU do you have and what
default
-march gets used for you? (thus please
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #4 from Dominique d'Humieres dominiq at lps dot ens.fr ---
Ugh - -Ofast is an alias for -O3 -ffast-math. Ah, no - it also enables
--param allow-store-data-races=1 ...
-Ofast
Disregard strict standards compliance. -Ofast enables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #5 from Dominique d'Humieres dominiq at lps dot ens.fr ---
My guess is that -fstack-arrays makes the difference.
Confirmed:
[Book15] lin/test% gfc -Ofast -fwhole-program fatigue.f90 -fno-stack-arrays
[Book15] lin/test% time a.out
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #6 from Dominique d'Humieres dominiq at lps dot ens.fr ---
The second runtime increase (with '-Ofast', the only one with '-O3
-ffast-math') is due to r217827
[Book15] lin/test% /opt/gcc/gcc4.10p-217825p1/bin/gfortran -Ofast
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099
--- Comment #7 from Dominique d'Humieres dominiq at lps dot ens.fr ---
The first runtime increase (with '-Ofast') is due to r216728:
[Book15] lin/test% /opt/gcc/gcc4.10p-216727p2/bin/gfortran -Ofast
-fwhole-program fatigue.f90
[Book15] lin/test%
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