[Bug target/44588] Very inefficient 8bit mod/div

[hjl at gcc dot gnu dot org]

------- Comment #7 from hjl at gcc dot gnu dot org  2010-07-07 21:11 -------
Subject: Bug 44588

Author: hjl
Date: Wed Jul  7 21:11:25 2010
New Revision: 161933

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161933
Log:
Backport 8bit div/mod improvements.

gcc/

2010-07-07  H.J. Lu  <hongjiu.lu@intel.com>

        Backport from mainline
        2010-07-04  H.J. Lu  <hongjiu.lu@intel.com>

        PR rtl-optimization/44695
        * config/i386/i386.md (extract_code): Removed.
        (<u>divmodqi4): Likewise.
        (divmodqi4): New.
        (udivmodqi4): Likewise.
        (divmodhiqi3): Change div/mod to HImode and extend operand 2 to
        HImode.
        (udivmodhiqi3): Likewise.

        2010-06-24  H.J. Lu  <hongjiu.lu@intel.com>

        PR target/44588
        * config/i386/i386.md (extract_code): New.
        (<u>divmodqi4): Likewise.
        (divmodhiqi3): Likewise.
        (udivmodhiqi3): Likewise.
        (<u>divqi3): Remvoved.

gcc/testsuite/

2010-07-07  H.J. Lu  <hongjiu.lu@intel.com>

        Backport from mainline
        2010-07-04  H.J. Lu  <hongjiu.lu@intel.com>

        PR rtl-optimization/44695
        * gcc.dg/torture/pr44695.c: New.

        2010-06-24  H.J. Lu  <hongjiu.lu@intel.com>

        PR target/44588
        * gcc.target/i386/mod-1.c: New.
        * gcc.target/i386/umod-1.c: Likewise.
        * gcc.target/i386/umod-2.c: Likewise.
        * gcc.target/i386/umod-3.c: Likewise.

Modified:
    branches/ix86/gcc-4_5-branch/gcc/config/i386/i386.md


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44588