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Subject: [Bug target/51244] New: SH Target: Inefficient conditional branch
Date: Sun, 20 Nov 2011 20:29:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51244

             Bug #: 51244
           Summary: SH Target: Inefficient conditional branch
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: oleg.endo@t-online.de
                CC: kkojima@gcc.gnu.org
            Target: sh*-*-*


Created attachment 25869
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25869
Examples

It seems that the condition inversion sometimes gets confused, resulting in
unnecessary code bloat.  The attached examples were compiled with -Os but the
same problem happens also at -O2 and -O3.

sh-elf-gcc -v
Using built-in specs.
COLLECT_GCC=sh-elf-gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/sh-elf/4.7.0/lto-wrapper
Target: sh-elf
Configured with: ../gcc-trunk/configure --target=sh-elf --prefix=/usr/local
--enable-languages=c,c++ --enable-multilib --disable-libssp --disable-nls
--disable-werror --enable-lto --with-newlib --with-gnu-as --with-gnu-ld
--with-system-zlib
Thread model: single
gcc version 4.7.0 20111119 (experimental) (GCC)