[Bug c/34903] New: -Os code size regression

["sposelenov at emcraft dot com" <gcc-bugzilla at gcc dot gnu dot org>]

I can't build the embedded application (U-Boot firmware) using the GCC 4.2.2
powerpc-linux cross because resultant code doesn't fit into the reserved space
anymore. GCC 4.0.0 powerpc cross build it OK.
Investigation showed that the code size generated by the GCC 4.2.2 is about 6%
bigger as produced by GCC 4.0.0, as reported by 'size':
gcc 4.2.2:
   text    data     bss     dec     hex filename
   2696      60    1536    4292    10c4 interrupts.o


gcc 4.0.0:
 text    data     bss     dec     hex filename
   2424      88    1536    4048     fd0 interrupts.o


In both cases, same compilation options are used:
ppc-linux-gcc -g -Os -fPIC -ffixed-r14 -meabi -fno-strict-aliasing -D__KERNEL__
-DTEXT_BASE=0xfffc0000 -I/work/psl/tmp/u-boot/include -fno-builtin
-ffreestanding -nostdinc -isystem
/opt/eldk-4.2-01-08/usr/bin/../lib/gcc/powerpc-linux/4.2.2/include -pipe
-DCONFIG_PPC -D__powerpc__ -DCONFIG_4xx -ffixed-r2 -ffixed-r29 -mstring
-msoft-float -Wa,-m440 -mcpu=440 -DCONFIG_440=1 -Wall -Wstrict-prototypes -c -o
interrupts.o interrupts.c

Removing "-ffixed" doesn't change the generated assembler code for 4.2.2
Test case and generated outputs will follow.


-- 
           Summary: -Os code size regression
           Product: gcc
           Version: 4.2.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sposelenov at emcraft dot com
GCC target triplet: powerpc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34903