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Use _div64 intrinsic if available (#1790)

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gendlin 2024-07-13 13:48:55 -04:00 committed by GitHub
parent c5587720b8
commit 4b1a859f95
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1 changed files with 9 additions and 1 deletions
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10
src/m_fixed.h
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@ -24,6 +24,14 @@
#include <stdlib.h> // abs()
#include <stdint.h> // int64_t
// VS 2019 and later provide a [64]/[32] intrinsic
#if defined(_MSC_VER) && _MSC_VER >= 1920 && (defined(_M_X64) || defined(_M_IX86))
#include <immintrin.h>
#define DIV64(a,b) (_div64((a),(b),NULL))
#else
#define DIV64(a,b) ((fixed_t)((a)/(b)))
#endif
//
// Fixed point, 32bit as 16.16.
//
@ -57,7 +65,7 @@ inline static fixed_t FixedDiv(fixed_t a, fixed_t b)
{
// [FG] avoid 31-bit shift (from Chocolate Doom)
return (abs(a)>>14) >= abs(b) ? ((a^b) < 0 ? INT_MIN : INT_MAX) :
(fixed_t)(((int64_t) a << FRACBITS) / b);
DIV64((int64_t) a << FRACBITS, b);
}
#endif