diff options
Diffstat (limited to 'compiler-rt/lib/builtins/floatuntisf.c')
| -rw-r--r-- | compiler-rt/lib/builtins/floatuntisf.c | 71 |
1 files changed, 34 insertions, 37 deletions
diff --git a/compiler-rt/lib/builtins/floatuntisf.c b/compiler-rt/lib/builtins/floatuntisf.c index bf1501daa4a..9dec0ab5c58 100644 --- a/compiler-rt/lib/builtins/floatuntisf.c +++ b/compiler-rt/lib/builtins/floatuntisf.c @@ -1,43 +1,40 @@ -/* ===-- floatuntisf.c - Implement __floatuntisf ---------------------------=== - * - * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. - * See https://llvm.org/LICENSE.txt for license information. - * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception - * - * ===----------------------------------------------------------------------=== - * - * This file implements __floatuntisf for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ +//===-- floatuntisf.c - Implement __floatuntisf ---------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file implements __floatuntisf for the compiler_rt library. +// +//===----------------------------------------------------------------------===// #include "int_lib.h" #ifdef CRT_HAS_128BIT -/* Returns: convert a to a float, rounding toward even. */ +// Returns: convert a to a float, rounding toward even. -/* Assumption: float is a IEEE 32 bit floating point type - * tu_int is a 128 bit integral type - */ +// Assumption: float is a IEEE 32 bit floating point type +// tu_int is a 128 bit integral type -/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ +// seee eeee emmm mmmm mmmm mmmm mmmm mmmm COMPILER_RT_ABI float __floatuntisf(tu_int a) { if (a == 0) return 0.0F; const unsigned N = sizeof(tu_int) * CHAR_BIT; - int sd = N - __clzti2(a); /* number of significant digits */ - int e = sd - 1; /* exponent */ + int sd = N - __clzti2(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 - */ + // 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; @@ -48,24 +45,24 @@ COMPILER_RT_ABI float __floatuntisf(tu_int a) { a = (a >> (sd - (FLT_MANT_DIG + 2))) | ((a & ((tu_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 */ + // 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 & ((tu_int)1 << FLT_MANT_DIG)) { a >>= 1; ++e; } - /* a is now rounded to FLT_MANT_DIG bits */ + // a is now rounded to FLT_MANT_DIG bits } else { a <<= (FLT_MANT_DIG - sd); - /* a is now rounded to FLT_MANT_DIG bits */ + // a is now rounded to FLT_MANT_DIG bits } float_bits fb; - fb.u = ((e + 127) << 23) | /* exponent */ - ((su_int)a & 0x007FFFFF); /* mantissa */ + fb.u = ((e + 127) << 23) | // exponent + ((su_int)a & 0x007FFFFF); // mantissa return fb.f; } -#endif /* CRT_HAS_128BIT */ +#endif // CRT_HAS_128BIT |
