diff options
| -rw-r--r-- | OpenAL32/Include/alMain.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h index c02d6b47..253b2870 100644 --- a/OpenAL32/Include/alMain.h +++ b/OpenAL32/Include/alMain.h @@ -271,8 +271,31 @@ inline ALint fastf2i(ALfloat f) /* Converts float-to-int using standard behavior (truncation). */ inline int float2int(float f) { - /* TODO: Make a more efficient method for x87. */ +#if ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__)) && \ + !defined(__SSE_MATH__)) || (defined(_MSC_VER) && defined(_M_IX86_FP) && _M_IX86_FP == 0) + ALint sign, shift, mant; + union { + ALfloat f; + ALint i; + } conv; + + conv.f = f; + sign = (conv.i>>31) | 1; + shift = ((conv.i>>23)&0xff) - (127+23); + + /* Over/underflow */ + if(UNLIKELY(shift >= 31 || shift < -23)) + return 0; + + mant = (conv.i&0x7fffff) | 0x800000; + if(LIKELY(shift < 0)) + return (mant >> -shift) * sign; + return (mant << shift) * sign; + +#else + return (ALint)f; +#endif } /* Rounds a float to the nearest integral value, according to the current |