------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-30 19:28
-------
On PPC, we get:
cmpwi cr0,r3,0
li r2,0
neg r0,r3
and r0,r3,r0
bne- cr0,L7
mr r3,r2
blr
L7:
cntlzw r0,r0
subfic r2,r0,31
mr r3,r2
blr
which is good and there is no extra subfic and also ffs has definition to return 0 for
0 so the extran
subtraction on the ffs causes this to be good code on PPC.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Component|tree-optimization |rtl-optimization
Keywords| |missed-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18233
