https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59535
Fredrik Hederstierna <fredrik.hederstie...@securitas-direct.com> changed:
What |Removed |Added
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CC| |fredrik.hederstierna@securi
| |tas-direct.com
--- Comment #18 from Fredrik Hederstierna
<fredrik.hederstie...@securitas-direct.com> ---
I compared GCC 4.8.3 and GCC 4.9.0 for arm-none-eabi, and I still see a code
size increase for thumb1 (and thumb2) for both my arm966e and my cortex-m4
targets.
GCC 4.8.3
RAM used 93812
Flash used 515968
GCC 4.9.0
RAM used 93812 (same)
Flash used 522608 (+1.3%)
Then I tried to disable LRA and results got better:
GCC 4.9.0 : added flag "-mno-lra"
RAM used 93812 (same)
Flash used 519624 (+0.7%)
Flags used are otherwise identical for both tests:
-Os -g3 -ggdb3 -gdwarf-4
-fvar-tracking-assignments -fverbose-asm -fno-common -ffunction-sections
-fdata-sections -fno-exceptions -fno-asynchronous-unwind-tables
-fno-unwind-tables
-mthumb -mcpu=arm966e-s -msoft-float -mno-unaligned-access
Generally GCC 4.9.0 seems to produce larger code, I tried to experiement with
LTO (-flto -flto-fat-objects), but then code size increased even more for both
GCC 4.8.3 and GCC 4.9.0, I was expecting a code decrease though.
Sorry I cannot share exact sources used for compilation here, I can share
toolchain build script though on request, or try to setup a small test case.
I first just wanted to confirm that this bug really is fixed and resolved, so
its not a new bug or another known issue.
BR /Fredrik
