diff options
Diffstat (limited to 'lib/floatdisf.c')
-rw-r--r-- | lib/floatdisf.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/floatdisf.c b/lib/floatdisf.c new file mode 100644 index 000000000..5a9284819 --- /dev/null +++ b/lib/floatdisf.c @@ -0,0 +1,76 @@ +//===-- floatdisf.c - Implement __floatdisf -------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __floatdisf for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" +#include <float.h> + +// Returns: convert a to a float, rounding toward even. + +// Assumption: float is a IEEE 32 bit floating point type +// di_int is a 64 bit integral type + +// seee eeee emmm mmmm mmmm mmmm mmmm mmmm + +float +__floatdisf(di_int a) +{ + if (a == 0) + return 0.0F; + const unsigned N = sizeof(di_int) * CHAR_BIT; + const di_int s = a >> (N-1); + a = (a ^ s) - s; + int sd = N - __builtin_clzll(a); // number of significant digits + int e = sd - 1; // exponent + if (sd > FLT_MANT_DIG) + { + // start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx + // finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR + // 12345678901234567890123456 + // 1 = msb 1 bit + // P = bit FLT_MANT_DIG-1 bits to the right of 1 + // Q = bit FLT_MANT_DIG bits to the right of 1 + // R = "or" of all bits to the right of Q + switch (sd) + { + case FLT_MANT_DIG + 1: + a <<= 1; + break; + case FLT_MANT_DIG + 2: + break; + default: + a = ((du_int)a >> (sd - (FLT_MANT_DIG+2))) | + ((a & ((du_int)(-1) >> ((N + FLT_MANT_DIG+2) - sd))) != 0); + }; + // finish: + a |= (a & 4) != 0; // Or P into R + ++a; // round - this step may add a significant bit + a >>= 2; // dump Q and R + // a is now rounded to FLT_MANT_DIG or FLT_MANT_DIG+1 bits + if (a & ((du_int)1 << FLT_MANT_DIG)) + { + a >>= 1; + ++e; + } + // a is now rounded to FLT_MANT_DIG bits + } + else + { + a <<= (FLT_MANT_DIG - sd); + // a is now rounded to FLT_MANT_DIG bits + } + float_bits fb; + fb.u = ((su_int)s & 0x80000000) | // sign + ((e + 127) << 23) | // exponent + ((su_int)a & 0x007FFFFF); // mantissa + return fb.f; +} |