On 2014-10-10 3:42 AM, Evgeny Stupachenko wrote:
Hi,
The patch enables EBX in RA for x86 32bits PIC mode.
It was discussed here: https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02513.html
Now there is working version with good performance and stability level
- it could be a solid first step of EBX enabling.
Bootstrap and make check passed.
There are several changes in "-m32" make check.
New pass:
gcc.target/i386/pr57003.c - before patch there was not enough registers to PASS
New fails:
gcc.target/i386/pic-1.c (test for errors, line 12) - now there are no
errors as we can do asm insertions with EBX
gcc.target/i386/pr23098.c scan-assembler-not .LC[0-9] - potential
performance opportunity using constant immediate
gcc.target/i386/pr55458.c (test for errors, line 10) - now there are
no errors as there enough registers
Performance on Silvermont (for the group of 3 patches):
at -Ofast -flto -funroll-loops -fPIC
EEMBC benchs:
+6% CoreMark
+3% Denmark
Individual test gained up to +25%
SPEC2000int is almost unchanged, SPEC2000fp +1,7%:
at -O2 -fPIC
EEMBC benchs:
+2% CoreMark
+5% Denmark
Individual test gained up to +25%
SPEC2000int and SPEC2000fp are almost unchanged:
Great results! The changes to RA (all ira* lra* file changes) is ok for
me. I'll probably add some comments to these changes on next week.
Thanks.
