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[Bug target/16532] Inefficient jump to epilogue
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Sep 2004 06:34:35 -0000
- Subject: [Bug target/16532] Inefficient jump to epilogue
- References: <20040713215437.16532.dann@godzilla.ics.uci.edu>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From ebotcazou at gcc dot gnu dot org 2004-09-28 06:34 -------
Here's the code generated by mainline as of today at -O2 -mcpu=ultrasparc:
FirstOne:
save %sp, -112, %sp
sethi %hi(64512), %o5
mov 0, %o4
sllx %i0, 32, %g1
srl %i1, 0, %i1
or %i1, %g1, %g1
srlx %g1, 32, %g1
srlx %g1, 32, %i4
mov %g1, %i5
or %o5, 1023, %o5
and %i4, %o4, %i4
sllx %i0, 32, %g1
srl %i1, 0, %i1
or %i1, %g1, %g1
srlx %g1, 48, %g1
srlx %g1, 32, %i2
mov %g1, %i3
orcc %i2, %i3, %g0
be,pt %icc, .LL2
and %i5, %o5, %i5
sethi %hi(first_one), %g1
or %g1, %lo(first_one), %g1
return %i7+8
ldub [%g1+%o3], %o0
.LL2:
orcc %i4, %i5, %g0
be,pt %icc, .LL5
sethi %hi(64512), %g1
sethi %hi(first_one), %g1
or %g1, %lo(first_one), %g1
ldub [%g1+%i5], %i5
return %i7+8
add %o5, 16, %o0
.LL5:
or %g1, 1023, %g1
and %i1, %g1, %i3
sllx %i0, 32, %g1
srl %i1, 0, %i1
or %i1, %g1, %g1
srlx %g1, 16, %g1
srlx %g1, 32, %i4
mov %g1, %i5
and %i4, %o4, %i0
and %i5, %o5, %i1
orcc %i0, %i1, %g0
be,pt %icc, .LL7
sethi %hi(first_one), %g1
or %g1, %lo(first_one), %g1
ldub [%g1+%i1], %i5
return %i7+8
add %o5, 32, %o0
.LL7:
or %g1, %lo(first_one), %g1
ldub [%g1+%i3], %i5
return %i7+8
add %o5, 48, %o0
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16532