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[Bug target/44072] Use 'add r0, 1' to replace 'cmp r0, -1' in thumb2
- From: "rearnsha 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 Jun 2010 23:00:46 -0000
- Subject: [Bug target/44072] Use 'add r0, 1' to replace 'cmp r0, -1' in thumb2
- References: <bug-44072-17659@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from rearnsha at gcc dot gnu dot org 2010-06-19 23:00 -------
Subject: Bug 44072
Author: rearnsha
Date: Sat Jun 19 23:00:31 2010
New Revision: 161040
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161040
Log:
PR target/44072
* arm.md (cmpsi2_addneg): Prefer emitting adds to subs with a negative
immediate.
* constraints.md (Pw, Px): New constraints.
* thumb2.md (cmpsi2_addneg peephole2): New peepholes.
* gcc.target/arm/thumb2-cmpneg2add-1.c: New test.
* gcc.target/arm/thumb2-cmpneg2add-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/arm/thumb2-cmpneg2add-1.c
trunk/gcc/testsuite/gcc.target/arm/thumb2-cmpneg2add-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/arm/arm.md
trunk/gcc/config/arm/constraints.md
trunk/gcc/config/arm/thumb2.md
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44072