[Bug target/44072] Use 'add r0, 1' to replace 'cmp r0, -1' in thumb2

[rearnsha 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


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44072