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Re: Optimizations
- To: ronis at onsager dot chem dot mcgill dot ca
- Subject: Re: Optimizations
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Tue, 09 Dec 1997 12:21:57 -0700
- cc: egcs at cygnus dot com
- Reply-To: egcs at cygnus dot com
In message <199712091751.MAA18879@ronispc.chem.mcgill.ca>you write:
> gcc -O6 -mpentium -fomit-frame-pointer -fexpensive-optimizations \
> >-ffast-math
-fexpensive-optimizations is on automatically if you specify -O2 or
higher.
Similarly for -fregmove.
-fdelayed-branch does nothing on x86 machines since they do not have
delayed branches.
-fschedule-insns* are normally enabled for -O2 or higher.
> Is -mno-ieee-fp implied by -ffast-math?
No. -ffast-math is a machine independent option while -mno-ieee-fp is
an x86 specific option. They are separate.
jeff