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48 lines
1.5 KiB
Text
48 lines
1.5 KiB
Text
;; SONIC ROBO BLAST 2
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;;-----------------------------------------------------------------------------
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;; Copyright (C) 1998-2000 by DooM Legacy Team.
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;; Copyright (C) 1999-2020 by Sonic Team Junior.
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;;
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;; This program is free software distributed under the
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;; terms of the GNU General Public License, version 2.
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;; See the 'LICENSE' file for more details.
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;;-----------------------------------------------------------------------------
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;; FILE:
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;; tmap_vc.nas
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;; DESCRIPTION:
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;; Assembler optimised math code for Visual C++.
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[BITS 32]
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%macro cglobal 1
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%define %1 _%1
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[global %1]
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%endmacro
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[SECTION .text write]
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;----------------------------------------------------------------------------
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;fixed_t FixedMul (fixed_t a, fixed_t b)
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;----------------------------------------------------------------------------
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cglobal FixedMul
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; align 16
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FixedMul:
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mov eax,[esp+4]
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imul dword [esp+8]
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shrd eax,edx,16
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ret
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;----------------------------------------------------------------------------
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;fixed_t FixedDiv2 (fixed_t a, fixed_t b);
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;----------------------------------------------------------------------------
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cglobal FixedDiv2
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; align 16
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FixedDiv2:
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mov eax,[esp+4]
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mov edx,eax ;; these two instructions allow the next
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sar edx,31 ;; two to pair, on the Pentium processor.
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shld edx,eax,16
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sal eax,16
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idiv dword [esp+8]
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ret
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