Author: Robert Hyatt
Date: 06:08:05 12/10/03
Go up one level in this thread
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 > >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). > >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. > >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? When you specify -m32, you get an X86 executable, which means no unusual registers or anything. -m64 (default on the box I am testing on) adds both 64 bit registers and the extra 8 registers %r8-%r15...
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