91bd698eaf
80bit Intel/PPC long double is excluded due to lacking support for the abstraction. Consistently provide saturation logic. Extend to long double on 128bit IEEE extended platforms. Initial patch with test cases from GuanHong Liu. Reviewed by Steve Canon. Differential Revision: http://reviews.llvm.org/D2804 llvm-svn: 231965
42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
//===-- lib/fixdfsi.c - Double-precision -> integer conversion ----*- C -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements float to 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 fixint_t __fixint(fp_t a) {
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const fixint_t fixint_max = (fixint_t)((~(fixuint_t)0) / 2);
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const fixint_t fixint_min = -fixint_max - 1;
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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 fixint_t 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 exponent is negative, the result is zero.
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if (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(fixint_t) * CHAR_BIT)
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return sign == 1 ? fixint_max : fixint_min;
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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 sign * (significand >> (significandBits - exponent));
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else
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return sign * ((fixint_t)significand << (exponent - significandBits));
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}
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