On Fri, 2005-05-20 at 17:44 +0200, Giovanni Bajo wrote: > Etienne Lorrain <[EMAIL PROTECTED]> wrote: > > > [EMAIL PROTECTED]:~/projet/gujin$ gcc -Os tst.c -c -o tst.o && size tst.o > > text data bss dec hex filename > > 261 0 0 261 105 tst.o > > [EMAIL PROTECTED]:~/projet/gujin$ ../toolchain/bin/gcc -Os tst.c -c -o tst.o > && > > size tst.o > > text data bss dec hex filename > > 5339 0 0 5339 14db tst.o > > [EMAIL PROTECTED]:~/projet/gujin$ > > It's another issue with SRA and -Os. With an old 4.1, I have: > > $ ./xgcc -c -Os -B. btst.c && size btst.o > text data bss dec hex filename > 5339 0 0 5339 14db btst.o > $ ./xgcc -c -Os -fno-tree-sra -B. btst.c && size btst.o > text data bss dec hex filename > 224 0 0 224 e0 btst.o > > So we're actually better than 3.3, after we disable -ftree-sra. I guess SRA > should be tuned (disabled?) for -Os.
Structure aliasing should be able to make up for turning off SRA, i'm guessing, at least as far as propagating constants and DCE is concerned. You could test this by seeing if -fno-tree-sra -fno-tree-salias produces an increased code size over the above. > > Please, do file a bugreport.
