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fixnum-shift-fast subprimitive

db4
Slava Pestov 2008-11-03 00:03:39 -06:00
parent 1aefde994f
commit dd20b39cd6
1 changed files with 15 additions and 0 deletions
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15
basis/cpu/x86/bootstrap.factor
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@ -302,6 +302,21 @@ big-endian off
ds-reg [] arg0 MOV ! save ds-reg [] arg0 MOV ! save
] f f f \ fixnum-bitnot define-sub-primitive ] f f f \ fixnum-bitnot define-sub-primitive
[
ECX ds-reg [] MOV ! load shift count
ECX tag-bits get SHR ! untag shift count
ds-reg bootstrap-cell SUB ! adjust stack pointer
arg0 ds-reg [] MOV ! load value
arg1 arg0 MOV ! make a copy
arg1 CL SHL ! compute positive shift value in arg1
ECX NEG ! compute negative shift value in arg0
arg0 CL SHR
arg0 tag-mask get bitnot AND
ECX 0 CMP ! if shift count was negative, move arg0 to arg1
arg1 arg0 CMOVLE
ds-reg [] arg1 MOV ! push to stack
] f f f \ fixnum-shift-fast define-sub-primitive
[ [
arg0 ds-reg [] MOV ! load local number arg0 ds-reg [] MOV ! load local number
fixnum>slot@ ! turn local number into offset fixnum>slot@ ! turn local number into offset