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Re: Changing CFLAGS for i386 packages on x86_64



Arjan van de Ven wrote:
On Fri, 2006-07-14 at 11:48 +0200, dragoran wrote:
Arjan van de Ven wrote:
On Fri, 2006-07-14 at 09:03 +0000, Kevin Kofler wrote:
Arjan van de Ven <arjan <at> fenrus.demon.nl> writes:
SSE in 32 bit is not "just used" by gcc
What about -ftree-vectorize?
that is, on 32 bit, not so cheap since it means transfering FP from the
x87 fpu to sse and back a lot.

ok but why isn't it enabled on x86_64 (for 64bit apps)
the packages are compiled with
-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic
(this is shown in about:buildconfig in 64bit mozilla)

perhaps because it's default enabled in -O2 ?

(also iirc mozilla doesn't use the same CFLAGs as the rest of the distro
does; but that could have gotten fixed recently of course)

-O2 is the same as:
-fdefer-pop -fde-layed-branch -fguess-branch-probability -fcprop-registers
-floop-optimize -fif-conversion -fif-conversion2 -ftree-ccp
-ftree-dce -ftree-dominator-opts -ftree-dse -ftree-ter -ftree-lrs
-ftree-sra -ftree-copyrename -ftree-fre -ftree-ch -fmerge-constants -fthread-jumps -fcrossjumping -foptimize-sibling-calls -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm -fexpensive-optimizations -fstrength-reduce -fre-run-cse-after-loop -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks -freorder-functions -funit-at-a-time -falign-functions -falign-jumps -falign-loops -falign-labels -ftree-vrp -ftree-pre


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