55 lines
762 B
PHP
55 lines
762 B
PHP
|
;; Copyright (c) 1992,1993-1995 Argonaut Technologies Limited. All rights reserved.
|
||
|
|
;;
|
||
|
|
;; $Id: 586_macs.inc 2.1 1996/03/21 11:11:16 sam Exp $
|
||
|
|
;; $Locker: $
|
||
|
|
;;
|
||
|
|
;; Various macros to play with optimisation on pentium
|
||
|
|
;;
|
||
|
|
; Swap two registers - xchg is not a 'simple' insn
|
||
|
|
;
|
||
|
|
SWAP macro ra,rb
|
||
|
|
if 0
|
||
|
|
xchg ra,rb
|
||
|
|
else
|
||
|
|
xor ra,rb
|
||
|
|
xor rb,ra
|
||
|
|
xor ra,rb
|
||
|
|
endif
|
||
|
|
endm
|
||
|
|
|
||
|
|
; Fix result of a fixed point multiply in edx:eax => eax
|
||
|
|
;
|
||
|
|
FIX_MUL macro
|
||
|
|
if 0
|
||
|
|
shrd eax,edx,16
|
||
|
|
else
|
||
|
|
shr eax,16
|
||
|
|
shl edx,16
|
||
|
|
or eax,edx
|
||
|
|
endif
|
||
|
|
endm
|
||
|
|
|
||
|
|
; Fraction
|
||
|
|
;
|
||
|
|
FIX_FMUL macro
|
||
|
|
if 0
|
||
|
|
shrd eax,edx,15
|
||
|
|
else
|
||
|
|
shr eax,15
|
||
|
|
shl edx,17
|
||
|
|
or eax,edx
|
||
|
|
endif
|
||
|
|
endm
|
||
|
|
|
||
|
|
; Fix input to fixed point divide in edx => edx:eax
|
||
|
|
;
|
||
|
|
FIX_DIV macro
|
||
|
|
|
||
|
|
mov eax,edx
|
||
|
|
sar edx,16
|
||
|
|
shl eax,16
|
||
|
|
|
||
|
|
endm
|
||
|
|
|
||
|
|
|