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if conversion running all the time
- To: gcc at gcc dot gnu dot org
- Subject: if conversion running all the time
- From: Andi Kleen <ak at suse dot de>
- Date: Sat, 30 Jun 2001 11:42:33 +0200
Hi,
I noticed that the two if-conversion passes run on a normal compile on
a i386 target on gcc 3.0. My understanding is that if-conversion on i386
can only do anything on i386 when CMOV/FCMOV are enabled (-march=686), because
the architecture has no other conditional instructions. But it seems to run even
without that option and eat some time (upto 5% of the runtime). Is it doing
anything useful for older architectures? Could it be disabled for arch<686
to make gcc a little bit faster again?
-Andi