[Bug target/17959] New: -mpowerpc64 can cause worse code than without it
pinskia at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Tue Oct 12 23:01:00 GMT 2004
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
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