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[Bug target/54830] New: [SH] Unnecessary exts.w before extu.b
- From: "olegendo at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 06 Oct 2012 00:04:10 +0000
- Subject: [Bug target/54830] New: [SH] Unnecessary exts.w before extu.b
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54830
Bug #: 54830
Summary: [SH] Unnecessary exts.w before extu.b
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: olegendo@gcc.gnu.org
Target: sh*-*-*
While working on another issue, I've spotted the following sequence
swap.w r11,r1
exts.w r1,r1
extu.b r1,r2
mov.l @(16,r12),r1
in CSiBE/jpeg-6b/jcphuff.c, function _emit_eobrun, when compiling with
-m4-single -ml -O2 -mpretend-cmove.
I will try to investigate that later.