mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-12-23 03:00:56 +00:00
48 lines
1.5 KiB
Text
48 lines
1.5 KiB
Text
;; SONIC ROBO BLAST 2
|
|
;;-----------------------------------------------------------------------------
|
|
;; Copyright (C) 1998-2000 by DooM Legacy Team.
|
|
;; Copyright (C) 1999-2016 by Sonic Team Junior.
|
|
;;
|
|
;; This program is free software distributed under the
|
|
;; terms of the GNU General Public License, version 2.
|
|
;; See the 'LICENSE' file for more details.
|
|
;;-----------------------------------------------------------------------------
|
|
;; FILE:
|
|
;; tmap_vc.nas
|
|
;; DESCRIPTION:
|
|
;; Assembler optimised math code for Visual C++.
|
|
|
|
|
|
[BITS 32]
|
|
|
|
%macro cglobal 1
|
|
%define %1 _%1
|
|
[global %1]
|
|
%endmacro
|
|
|
|
[SECTION .text write]
|
|
|
|
;----------------------------------------------------------------------------
|
|
;fixed_t FixedMul (fixed_t a, fixed_t b)
|
|
;----------------------------------------------------------------------------
|
|
cglobal FixedMul
|
|
; align 16
|
|
FixedMul:
|
|
mov eax,[esp+4]
|
|
imul dword [esp+8]
|
|
shrd eax,edx,16
|
|
ret
|
|
|
|
;----------------------------------------------------------------------------
|
|
;fixed_t FixedDiv2 (fixed_t a, fixed_t b);
|
|
;----------------------------------------------------------------------------
|
|
cglobal FixedDiv2
|
|
; align 16
|
|
FixedDiv2:
|
|
mov eax,[esp+4]
|
|
mov edx,eax ;; these two instructions allow the next
|
|
sar edx,31 ;; two to pair, on the Pentium processor.
|
|
shld edx,eax,16
|
|
sal eax,16
|
|
idiv dword [esp+8]
|
|
ret
|