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Make it usable on non-SSE platforms (#60)

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* at one place HANDMADE_NO_SSE instead of HANDMADE_MATH_NO_SSE was used
* introduce HANDMADE_MATH__USE_SSE for the SSE #ifdefs throughout code
  - use #ifdef HANDMADE_MATH_NO_SSE at only one place
* only use SSE (#define HANDMADE_MATH__USE_SSE) if the targetplatform
  actually supports it
  => users don't have to #define HANDMADE_MATH_NO_SSE on ARM etc
* at one place HMM_SqrtF instead of HMM_SquareRootF was used
This commit is contained in:
Daniel Gibson
2017-06-10 02:14:24 +02:00
committed by Zak Strange
parent cf606db217
commit ff4513ff33
1 changed files with 27 additions and 7 deletions
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34
HandmadeMath.h
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@@ -200,7 +200,27 @@
Insofaras (@insofaras)
*/
#ifndef HANDMADE_NO_SSE
// let's figure out if SSE is really available (unless disabled anyway)
// (it isn't on non-x86/x86_64 platforms or even x86 without explicit SSE support)
// => only use "#ifdef HANDMADE_MATH__USE_SSE" to check for SSE support below this block!
#ifndef HANDMADE_MATH_NO_SSE
# ifdef _MSC_VER
// MSVC supports SSE in amd64 mode or _M_IX86_FP >= 1 (2 means SSE2)
# if defined(_M_AMD64) || ( defined(_M_IX86_FP) && _M_IX86_FP >= 1 )
# define HANDMADE_MATH__USE_SSE 1
# endif
# else // not MSVC, probably GCC, clang, icc or something that doesn't support SSE anyway
# ifdef __SSE__ // they #define __SSE__ if it's supported
# define HANDMADE_MATH__USE_SSE 1
# endif // __SSE__
# endif // not _MSC_VER
#endif // #ifndef HANDMADE_MATH_NO_SSE
#ifdef HANDMADE_MATH__USE_SSE
#include <xmmintrin.h>
#endif
@@ -757,12 +777,12 @@ HMM_SquareRootF(float Value)
{
float Result = 0.0f;
#ifdef HANDMADE_MATH_NO_SSE
Result = sqrtf(Value);
#else
#ifdef HANDMADE_MATH__USE_SSE
__m128 In = _mm_set_ss(Value);
__m128 Out = _mm_sqrt_ss(In);
Result = _mm_cvtss_f32(Out);
#else
Result = sqrtf(Value);
#endif
return(Result);
@@ -773,12 +793,12 @@ HMM_RSquareRootF(float Value)
{
float Result = 0.0f;
#ifdef HANDMADE_MATH_NO_SSE
Result = 1.0f/HMM_SqrtF(Value);
#else
#ifdef HANDMADE_MATH__USE_SSE
__m128 In = _mm_set_ss(Value);
__m128 Out = _mm_rsqrt_ss(In);
Result = _mm_cvtss_f32(Out);
#else
Result = 1.0f/HMM_SquareRootF(Value);
#endif
return(Result);