| /* APPLE LOCAL file 5316398 improved float/double -> int64 functions */ |
| #include <stdint.h> |
| |
| uint64_t |
| __fixunssfdi (float x) |
| { |
| union { float f; uint32_t u; } u = {x}; |
| uint32_t hi, lo; |
| |
| /* early out for common small positive numbers. */ |
| if (__builtin_expect (u.u < 0x4f800000U, 1)) |
| return (uint64_t) ((uint32_t) x); |
| |
| /* larger non-overflowing cases are all exact, so we just need to do |
| the conversion in integer code */ |
| /* if( 0x1.0p32f <= x < 0x1.0p63f ) */ |
| if (__builtin_expect (u.u < 0x5f800000U, 1)) |
| { |
| uint32_t bits = (u.u & 0x007fffffU) | 0x00800000U; |
| uint32_t shift = (u.u >> 23) - (127 + 23); |
| if (shift < 32) |
| { |
| hi = bits >> (32 - shift); |
| lo = bits << shift; |
| } |
| else |
| { |
| hi = bits << (shift - 32); |
| lo = 0; |
| } |
| return ((uint64_t) hi << 32) | lo; |
| } |
| |
| /* Overflow or NaN: convert value to unsigned int, set invalid as |
| necessary */ |
| hi = x; |
| |
| /* extend to 64-bits. */ |
| lo = (hi << 1) | (hi & 1); |
| return ((uint64_t) hi << 32) | lo; |
| } |
