diff options
Diffstat (limited to 'lib/builtins/floatdixf.c')
-rw-r--r-- | lib/builtins/floatdixf.c | 67 |
1 files changed, 31 insertions, 36 deletions
diff --git a/lib/builtins/floatdixf.c b/lib/builtins/floatdixf.c index d39e81d7ca75..ad5deb2d4bf5 100644 --- a/lib/builtins/floatdixf.c +++ b/lib/builtins/floatdixf.c @@ -1,46 +1,41 @@ -/* ===-- floatdixf.c - Implement __floatdixf -------------------------------=== - * - * The LLVM Compiler Infrastructure - * - * This file is dual licensed under the MIT and the University of Illinois Open - * Source Licenses. See LICENSE.TXT for details. - * - * ===----------------------------------------------------------------------=== - * - * This file implements __floatdixf for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ +//===-- floatdixf.c - Implement __floatdixf -------------------------------===// +// +// 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 __floatdixf for the compiler_rt library. +// +//===----------------------------------------------------------------------===// #if !_ARCH_PPC #include "int_lib.h" -/* Returns: convert a to a long double, rounding toward even. */ +// Returns: convert a to a long double, rounding toward even. -/* Assumption: long double is a IEEE 80 bit floating point type padded to 128 bits - * di_int is a 64 bit integral type - */ +// Assumption: long double is a IEEE 80 bit floating point type padded to 128 +// bits di_int is a 64 bit integral type -/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | - * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm - */ +// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee +// eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm +// mmmm mmmm mmmm -COMPILER_RT_ABI long double -__floatdixf(di_int a) -{ - if (a == 0) - return 0.0; - const unsigned N = sizeof(di_int) * CHAR_BIT; - const di_int s = a >> (N-1); - a = (a ^ s) - s; - int clz = __builtin_clzll(a); - int e = (N - 1) - clz ; /* exponent */ - long_double_bits fb; - fb.u.high.s.low = ((su_int)s & 0x00008000) | /* sign */ - (e + 16383); /* exponent */ - fb.u.low.all = a << clz; /* mantissa */ - return fb.f; +COMPILER_RT_ABI long double __floatdixf(di_int a) { + if (a == 0) + return 0.0; + const unsigned N = sizeof(di_int) * CHAR_BIT; + const di_int s = a >> (N - 1); + a = (a ^ s) - s; + int clz = __builtin_clzll(a); + int e = (N - 1) - clz; // exponent + long_double_bits fb; + fb.u.high.s.low = ((su_int)s & 0x00008000) | // sign + (e + 16383); // exponent + fb.u.low.all = a << clz; // mantissa + return fb.f; } -#endif /* !_ARCH_PPC */ +#endif // !_ARCH_PPC |