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[Bug target/36133] GCC creates suboptimal ASM : Code includes unneeded TST instructions
- From: "ams 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 Nov 2008 11:25:03 -0000
- Subject: [Bug target/36133] GCC creates suboptimal ASM : Code includes unneeded TST instructions
- References: <bug-36133-16150@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from ams at gcc dot gnu dot org 2008-11-19 11:25 -------
Subject: Bug 36133
Author: ams
Date: Wed Nov 19 11:23:28 2008
New Revision: 141999
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141999
Log:
2008-11-19 Andrew Stubbs <ams@codesourcery.com>
gcc/
PR target/36133
* config/m68k/m68k.h (CC_OVERFLOW_UNUSABLE, CC_NO_CARRY): New defines.
* config/m68k/m68k.c (notice_update_cc): Set cc_status properly for
shift instructions.
* config/m68k/m68k.md: Adjust all conditional branches that use the
carry and overflow flags so they understand CC_OVERFLOW_UNUSABLE.
gcc/testsuite/
PR target/36133
* gcc.target/m68k/pr36133.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/m68k/pr36133.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/m68k/m68k.c
trunk/gcc/config/m68k/m68k.h
trunk/gcc/config/m68k/m68k.md
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36133