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24 C and C++ Source-Level Optimizations Chapter 2
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
FIXED_U_16_16 z;
z.whole = x.whole + y.whole;
return(z);
}
__inline unsigned int fixed_int(FIXED_U_16_16 x) {
return (x.whole >> 16);
}
...
FIXED_U_16_16 y, z;
unsigned int q;
...
label1:
y = fixed_add (y, z);
q = fixed_int (y);
label2:
...
The object code generated for the source code between label1 and label2 typically looks like this:
mov edx, DWORD PTR [z]
mov eax, DWORD PTR [y]
add eax, edx
mov DWORD PTR [y], eax ; -+
mov eax, DWORD PTR [y] ; <+ Aligned (size/address match)--forwarding in LSU
shr eax, 16
mov DWORD PTR [q], eax