Chris Gehlker wrote: > In the Intel world, the data path isn't wider between i386 and > ix86-64. There are more registers, but compilers haven't really been > optimized to use them yet. But even when they are, one cache miss will > wipe out the gains from running hundreds of instructions with more > registers. > This isn't true at all. If you're running in x86-64 and something has been compiled as x86-64 you will absolutely use the additional registers. Compilers (at least GCC and Intel's compiler, I can't speak for Microsoft's) have supported x86-64 for quite a while now.
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