[Bug rtl-optimization/81625] GCC v4.7 ... v8 is bloating code by > 25% compared to v3.4

[fredrik.hederstierna@securitas-direct.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81625

Fredrik Hederstierna <fredrik.hederstierna@securitas-direct.com> changed:

           What    |Removed                     |Added
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                 CC|                            |fredrik.hederstierna@securi
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--- Comment #3 from Fredrik Hederstierna <fredrik.hederstierna@securitas-direct.com> ---
Checked size of text segment on arm-none-eabi from 4.6 to 7.1 but no major
difference seen, though some increase in later releases.

I previously saw code growt especially on ARM thumb1 code, but seems to be on
track again with newer releases, at least when running CsiBE benchmark.

gcc-4.6.4    1868 bytes (0)
gcc-4.7.4    1844 bytes (-1.3%)
gcc-4.8.5    1832 bytes (-1.9%)
gcc-4.9.3    1824 bytes (-2.4%)
gcc-5.3.0    1832 bytes (-1.9%)
gcc-6.3.0    1856 bytes (-0.6%)
gcc-7.1.0    1856 bytes (-0.6%)
gcc-8-master 1872 bytes (+0.2%)

arm-none-eabi-gcc -c -Os -std=gnu89 -mcpu=cortex-m3 -mthumb snake.c

See my CSibe benchmark data at http://gcc.hederstierna.com/csibe/
currently only for ARM but my plan was to add more targets after time, but
project halted due now to no time unfortunately.