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Re: Dec 30 patch causes large performance regression on ia64
- To: bernds at cambridge dot redhat dot com
- Subject: Re: Dec 30 patch causes large performance regression on ia64
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Date: Fri, 9 Feb 01 11:48:39 EST
- Cc: gcc-bugs at gcc dot gnu dot org
might cause a 20% performance drop when running the 147.vortex benchmark
from SPEC95 on ia64-linux?
No, not at all. It could have a negative affect on stack usage, but
shouldn't have an effect on execution speed other than a second-order
effect in that if stack slots aren't shared, the data cache hit rate
may go down, but that seems unlike to cause a 20% hit.