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[Bug rtl-optimization/25972] pack and unpack of long doubles via union generates poor code
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Nov 2007 18:05:23 -0000
- Subject: [Bug rtl-optimization/25972] pack and unpack of long doubles via union generates poor code
- References: <bug-25972-1057@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from pinskia at gcc dot gnu dot org 2007-11-03 18:05 -------
Doing that (removing MAX_FIXED_MODE_SIZE), gets us:
.pack:
stfd 1,-16(1)
stfd 2,-8(1)
lfd 1,-16(1)
lfd 2,-8(1)
blr
.unpack:
stfd 1,-16(1)
stfd 2,-8(1)
lfd 0,-16(1)
lfd 13,-8(1)
stfd 0,0(5)
stfd 13,0(6)
blr
which is much better for pack (less LHS on cell).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25972