amd processor - What is the cost of converting 32-bit integer to double for Intel and AMD architecture? -



amd processor - What is the cost of converting 32-bit integer to double for Intel and AMD architecture? -

i'm under impression conversions , forth between these 2 representations not expensive operations on modern hardware, true?

intel says can rather expensive (on pentium 4 visual c++ 6), using intels' vtune performance analyser, can turn heavy, slow, _ftol phone call single fistp fpu instruction 5x performance gain.

then enabling sse2 instructions give 11x performance gain, hear has high latency penatly. there's farther speed using sse3.

so, i'm not sure performance nowadays, although think sse2 enabled default in vc++, i'm pretty sure in gcc.

intel amd-processor

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