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Re: 2.95, x86: severe performance problems with short arithmetic
- To: Zack Weinberg <zack at bitmover dot com>
- Subject: Re: 2.95, x86: severe performance problems with short arithmetic
- From: Alexander Sokolov <robocop at amur dot rosnet dot ru>
- Date: Wed, 11 Aug 1999 16:24:08 +1100 (VLAST)
- cc: John Wehle <john at feith dot com>, gcc at gcc dot gnu dot org
On Tue, 10 Aug 1999, Zack Weinberg wrote:
> Does this include something like this?
>
> movzbw %dl, %ax
> addl %eax, %esi
Yes, it does. When 32-bit register is read or written after 8- or 16-bit
register has been written, this will cause patial register stall on P6
family.
--
Alexander Sokolov
System Administrator
ROSNET Komsomolsk-na-Amure
Tel./Fax: +7-095-737-6260