57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
//===-- lib/fixdfsi.c - Double-precision -> integer conversion ----*- C -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements float to unsigned integer conversion for the
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// compiler-rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "fp_lib.h"
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static __inline fixuint_t __fixuint(fp_t a) {
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// Break a into sign, exponent, significand
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const rep_t aRep = toRep(a);
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const rep_t aAbs = aRep & absMask;
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const int sign = aRep & signBit ? -1 : 1;
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const int exponent = (aAbs >> significandBits) - exponentBias;
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const rep_t significand = (aAbs & significandMask) | implicitBit;
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// If either the value or the exponent is negative, the result is zero.
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if (sign == -1 || exponent < 0)
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return 0;
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// If the value is too large for the integer type, saturate.
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if ((unsigned)exponent >= sizeof(fixuint_t) * CHAR_BIT)
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return ~(fixuint_t)0;
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// If 0 <= exponent < significandBits, right shift to get the result.
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// Otherwise, shift left.
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if (exponent < significandBits)
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return significand >> (significandBits - exponent);
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else
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return (fixuint_t)significand << (exponent - significandBits);
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}
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