Daniel Berlin <[EMAIL PROTECTED]> wrote: >> $ ./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.
Not really: with -fno-tree-salias I get exactly the same result (224 bytes). Giovanni Bajo
