forked from OSchip/llvm-project
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
//===-- lib/floatunsisf.c - uint -> single-precision 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 unsigned integer to single-precision conversion for the
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// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
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// mode.
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//
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//===----------------------------------------------------------------------===//
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#define SINGLE_PRECISION
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#include "fp_lib.h"
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#include "int_lib.h"
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COMPILER_RT_ABI fp_t __floatunsisf(unsigned int a) {
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const int aWidth = sizeof a * CHAR_BIT;
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// Handle zero as a special case to protect clz
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if (a == 0)
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return fromRep(0);
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// Exponent of (fp_t)a is the width of abs(a).
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const int exponent = (aWidth - 1) - __builtin_clz(a);
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rep_t result;
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// Shift a into the significand field, rounding if it is a right-shift
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if (exponent <= significandBits) {
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const int shift = significandBits - exponent;
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result = (rep_t)a << shift ^ implicitBit;
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} else {
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const int shift = exponent - significandBits;
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result = (rep_t)a >> shift ^ implicitBit;
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rep_t round = (rep_t)a << (typeWidth - shift);
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if (round > signBit)
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result++;
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if (round == signBit)
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result += result & 1;
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}
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// Insert the exponent
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result += (rep_t)(exponent + exponentBias) << significandBits;
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return fromRep(result);
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}
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#if defined(__ARM_EABI__)
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#if defined(COMPILER_RT_ARMHF_TARGET)
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AEABI_RTABI fp_t __aeabi_ui2f(unsigned int a) { return __floatunsisf(a); }
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#else
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COMPILER_RT_ALIAS(__floatunsisf, __aeabi_ui2f)
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#endif
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#endif
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