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[Bug rtl-optimization/15533] Missed move to partial register
- 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: 19 May 2004 01:45:31 -0000
- Subject: [Bug rtl-optimization/15533] Missed move to partial register
- References: <20040519012526.15533.cesarb@nitnet.com.br>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-19 01:45 -------
With -march=i686:
xorl %edx, %edx
xorb %al, %al
movb a, %dl
orl %edx, %eax
andl $65535, %eax
ret
Which is different but still inefficient, this is an rtl problem as the tree level is optimized as fully as it
can be (well it could be a little more but it would not matter as I tried with the most optimal one for the
trees.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Component|tree-optimization |rtl-optimization
Ever Confirmed| |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2004-05-19 01:45:30
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15533