Author: Gian-Carlo Pascutto
Date: 10:49:15 03/30/04
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On March 30, 2004 at 13:43:38, Gerd Isenberg wrote: >As i saw so far, the 64-bit speedup is not as good as expected. >I can't imagine that the signed index issue is that expensive. Fixing it gives about a 5-7% overall speedup for SOS and Deep Sjeng. >With similar optimization abilities the 64-bit code should be much faster, >simply due to the eight additional registers and (per default? fastcall instead >of cdecl or pascal parameter passing). Alignment and Load/Store forewarding >stalls are important issues too, but even true for 32-bit code. > >My guess is, that the 64-bit ms-compiler you use is yet too safe or paranoid >with aliasing issues and tends to write locals inside registers to memory >permanently. Yes. Speedups with GCC are higher than with MSVC betas. Especially new GCC 3.4 is impressive. -- GCP
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