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* [Bug target/17959] New: -mpowerpc64 can cause worse code than without it
@ 2004-10-12 23:01 pinskia at gcc dot gnu dot org
2004-10-12 23:03 ` [Bug target/17959] " pinskia at gcc dot gnu dot org
2004-11-28 8:27 ` amodra at bigpond dot net dot au
0 siblings, 2 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-12 23:01 UTC (permalink / raw)
To: gcc-bugs
unsigned long long div16(unsigned long long n) { return n / 16; }
Without -mpowerpc64:
_div16:
slwi r0,r3,28
srwi r4,r4,4
or r4,r0,r4
srwi r3,r3,4
blr
With:
_div16:
li r0,0
rldimi r0,r3,32,0
rldimi r0,r4,0,32
srdi r4,r0,4
srdi r3,r0,36
blr
--
Summary: -mpowerpc64 can cause worse code than without it
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: powerpc-darwin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17959
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug target/17959] -mpowerpc64 can cause worse code than without it 2004-10-12 23:01 [Bug target/17959] New: -mpowerpc64 can cause worse code than without it pinskia at gcc dot gnu dot org @ 2004-10-12 23:03 ` pinskia at gcc dot gnu dot org 2004-11-28 8:27 ` amodra at bigpond dot net dot au 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-10-12 23:03 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-10-12 23:03:57 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17959 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/17959] -mpowerpc64 can cause worse code than without it 2004-10-12 23:01 [Bug target/17959] New: -mpowerpc64 can cause worse code than without it pinskia at gcc dot gnu dot org 2004-10-12 23:03 ` [Bug target/17959] " pinskia at gcc dot gnu dot org @ 2004-11-28 8:27 ` amodra at bigpond dot net dot au 1 sibling, 0 replies; 3+ messages in thread From: amodra at bigpond dot net dot au @ 2004-11-28 8:27 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From amodra at bigpond dot net dot au 2004-11-28 08:27 ------- powerpc-linux too. 3.4 is even worse due to needlessly setting up a stack frame. -- What |Removed |Added ---------------------------------------------------------------------------- GCC target triplet|powerpc-darwin |powerpc-*-* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17959 ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2004-11-28 8:27 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-10-12 23:01 [Bug target/17959] New: -mpowerpc64 can cause worse code than without it pinskia at gcc dot gnu dot org 2004-10-12 23:03 ` [Bug target/17959] " pinskia at gcc dot gnu dot org 2004-11-28 8:27 ` amodra at bigpond dot net dot au
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