x86UNIXMath_ASM.cpp

Public Functions

S32

m_mulDivS32_ASM(S32 a, S32 b, S32 c)

U32

m_mulDivU32_ASM(S32 a, S32 b, U32 c)

void

mInstallLibrary_ASM()

Public Functions

m_mulDivS32_ASM(S32 a, S32 b, S32 c)

m_mulDivU32_ASM(S32 a, S32 b, U32 c)

mInstallLibrary_ASM()

 1
 2//-----------------------------------------------------------------------------
 3// Copyright (c) 2012 GarageGames, LLC
 4//
 5// Permission is hereby granted, free of charge, to any person obtaining a copy
 6// of this software and associated documentation files (the "Software"), to
 7// deal in the Software without restriction, including without limitation the
 8// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 9// sell copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11//
12// The above copyright notice and this permission notice shall be included in
13// all copies or substantial portions of the Software.
14//
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21// IN THE SOFTWARE.
22//-----------------------------------------------------------------------------
23
24#include "math/mMath.h"
25
26static S32 m_mulDivS32_ASM(S32 a, S32 b, S32 c)
27{  // a * b / c
28   S32 r;
29   
30   __asm__ __volatile__(
31      "imul  %2\n"
32      "idiv  %3\n"
33      : "=a" (r) : "a" (a) , "b" (b) , "c" (c) 
34      );
35   return r;
36}   
37
38
39static U32 m_mulDivU32_ASM(S32 a, S32 b, U32 c)
40{  // a * b / c
41   S32 r;
42   __asm__ __volatile__(
43      "mov   $0, %%edx\n"
44      "mul   %2\n"
45      "div   %3\n"
46      : "=a" (r) : "a" (a) , "b" (b) , "c" (c) 
47      );
48   return r;
49}   
50
51//------------------------------------------------------------------------------
52void mInstallLibrary_ASM()
53{
54   m_mulDivS32              = m_mulDivS32_ASM;
55   m_mulDivU32              = m_mulDivU32_ASM;
56}
57