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82 Instruction-Decoding Optimizations Chapter 4
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
Example 3
Avoid:
mov al, bl
Preferred:
movzx eax, bl
Example 4
Avoid:
mov al, [ebx]
Preferred:
movzx eax, byte ptr [ebx]
Example 5
Avoid:
mov al, 01h
Preferred:
mov eax, 00000001h
Example 6
Avoid:
movss xmm1, xmm2
Preferred:
movaps xmm1, xmm2