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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