Author: Slater Wold
Date: 22:22:23 12/09/03
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On December 10, 2003 at 01:10:23, Russell Reagan wrote: >On December 10, 2003 at 00:20:35, Slater Wold wrote: > >>144 - SuSe 8 - gcc 33 -m32 = 1109 >>144 - SuSe 8 - gcc 33 -m64 = 1562 >> >>41% going from 32 to 64 bit on Crafty! >> >>And others: >> >>144 - SuSe 8 - ICC 7.0 (32)= 1199 >>144 - W2003E - ICC 7.0 (32)= 1230 Let me try to answer... >I think there are more questions to answer. One is the one you just answered, >which is how much of a speedup we can from the 64-bit compilation alone. Another >is how much of a speedup we get from the Opteron's hardware (ex. 32-bit Athlon >vs. 64-bit Athlon/Opteron). All using Windows with ICC 7.0: Athlon XP3200+ (2.2Ghz) = 1324 Athlon 643200+ (2.0Ghz) = 1370 (32) Athlon FX51 (2.2Ghz) = 1504 (32) >Another is how much of a speedup non-bitboard programs will get from the 64-bit >hardware and 64-bit compilation. Maybe someone could compile some non-bitboard >programs. I guess even TSCP's bench command might give us some answers. This is a question I cannot answer, as of yet. It seems that in very rare cases, you can see a slow down. Ususally you'll see 'like results'. And occasionally you'll get a program like Crafty, that will fly. >One question I have is, does the 32-bit gcc compilation on 64-bit hardware still >take advantage of all 16 general purpose registers? Or does it compile it for a >32-bit executable you could run on a 32-bit CPU? The first.
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