------- Comment #11 from dave at hiauly1 dot hia dot nrc dot ca 2006-09-10
00:02 -------
Subject: Re: g++.dg/tree-ssa/ivopts-1.C fails
> It confirms that it is the same problem as on i?86, but it doesn't tell
> why. I don't see an obvious difference in config/pa/
Yes, it does seem to be the same problem. The hpux assembler
output has a -4 offset:
stw %r2,-20(%r30)
L$CFI0000
ldi 1,%r19
ldo 128(%r30),%r30
L$CFI0001
ldo -116(%r30),%r28
ldo -100(%r30),%r20
stw %r19,-4(%r28)
L$0008:
ldo 4(%r28),%r28
comb,<>,n %r20,%r28,L$0008
stw %r19,-4(%r28)
.CALL ARGW0=GR
bl _Z3fooR3Foo,%r2
ldo -120(%r30),%r26
The linux output doesn't have the -4 offset:
ldi 1,%r28
stw %r2,-20(%r30)
.LCFI0:
copy %r28,%r21
ldo 128(%r30),%r30
.LCFI1:
ldi 4,%r19
stw %r28,-120(%r30)
ldo -120(%r30),%r26
ldi 16,%r20
.L2:
addl %r19,%r26,%r28
ldo 4(%r19),%r19
comb,<> %r20,%r19,.L2
stw %r21,0(%r28)
bl _Z3fooR3Foo,%r2
nop
Offhand, then hpux code appears better optimized.
Dave
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27707
