AMD 250 User Manual
166
Integer Optimizations
Chapter 8
25112
Rev. 3.06
September 2005
Software Optimization Guide for AMD64 Processors
add
reg1, reg2
by 22: imul
reg1, 22 ; Use the IMUL instruction.
by 23: lea
reg2, [reg1+reg1*8] ; 3 cycles
shl
reg1, 5
sub
reg1, reg2
by 24: lea
reg1, [reg1+reg1*2] ; 3 cycles
shl
reg1, 3
by 25: lea
reg2, [reg1+reg1*8] ; 3 cycles
shl
reg1, 4
add
reg1, reg2
by 26: imul
reg1, 26 ; Use the IMUL instruction.
by 27: lea
reg2, [reg1+reg1*4] ; 3 cycles
shl
reg1, 5
sub
reg1, reg2
by 28: lea
reg2, [REG1*4] ; 3 cycles
shl
reg1, 5
sub
reg1, reg2
by 29: lea
reg2, [reg1+reg1*2] ; 3 cycles
shl
reg1, 5
sub
reg1, reg2
by 30: lea
reg2, [reg1+reg1] ; 3 cycles
shl
reg1, 5
sub
reg1, reg2
by 31: mov
reg2, reg1 ; 2 cycles
shl
reg1, 5
sub
reg1, reg2
by 32: shl
reg1, 5 ; 1 cycle