On Wed, Oct 8, 2008 at 6:15 PM, Andrew Haley <aph@xxxxxxxxxx> wrote: >> so in gcc command line I have replaced -O1 with all these parameters, >> but I obtain a larger binary and a worst stack usage. Is the same >> thing of -O0. >> How can I reproduce -O1 behaviour using simple command line parameter? > > You can't have optimization without -O. I tried two different build one witch -O0 and the second with -O1 -fno-defer-pop -fno-delayed-branch -fno-guess-branch-probability -fno-cprop-registers -fno-if-conversion -fno-if-conversion2 -fno-tree-ccp -fno-tree-dce -fno-tree-dominator-opts -fno-tree-dse -fno-tree-ter -fno-tree-lrs -fno-tree-sra -fno-tree-copyrename -fno-tree-fre -fno-tree-ch -fno-unit-at-a-time -fno-merge-constants -fno-ipa-pure-const -fno-ipa-reference -fno-omit-frame-pointer -fno-tree-copy-prop -fno-tree-salias -fno-tree-sink -fno-var-tracking to reproduce the -O0 behaviour from .lst files in both cases I can read: options enabled: -falign-loops -fargument-alias -fbranch-count-reg -fcommon -fdata-sections -fearly-inlining -feliminate-unused-debug-types -ffunction-cse -ffunction-sections -fgcse-lm -fident -finline-functions-called-once -fivopts -fkeep-static-consts -fleading-underscore -fmath-errno -fmove-loop-invariants -fpeephole -freg-struct-return -fsched-interblock -fsched-spec -fsched-stalled-insns-dep -fshow-column -fsplit-ivs-in-unroller -ftoplevel-reorder -ftrapping-math -ftree-loop-im -ftree-loop-ivcanon -ftree-loop-optimize -ftree-vect-loop-version -fverbose-asm -fzero-initialized-in-bss -mlittle-endian -msched-prolog but when I compile with -O0 I obtain for example a 300KB binary and too much stack usage. In second case I obtain a 200KB binary and a very less stack usage than -O0 case. I need only stack usage optimization and NO code optimization (to let us easly debug the code), which parameters I need to use? thanks -- Pro pace mundi adversus meganoides tertio Daitarn pugnabo. Nisi times hanc vim, pugna! Massimiliano Cialdi cialdi@xxxxxxxxx massimiliano.cialdi@xxxxxxxxxxxx
