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-rw-r--r--lib/floatsisf.c58
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diff --git a/lib/floatsisf.c b/lib/floatsisf.c
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-//===-- lib/floatsisf.c - integer -> single-precision conversion --*- C -*-===//
-//
-// 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 integer to single-precision conversion for the
-// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
-// mode.
-//
-//===----------------------------------------------------------------------===//
-
-#define SINGLE_PRECISION
-#include "fp_lib.h"
-
-#include "int_lib.h"
-
-ARM_EABI_FNALIAS(i2f, floatsisf)
-
-fp_t __floatsisf(int a) {
-
- const int aWidth = sizeof a * CHAR_BIT;
-
- // Handle zero as a special case to protect clz
- if (a == 0)
- return fromRep(0);
-
- // All other cases begin by extracting the sign and absolute value of a
- rep_t sign = 0;
- if (a < 0) {
- sign = signBit;
- a = -a;
- }
-
- // Exponent of (fp_t)a is the width of abs(a).
- const int exponent = (aWidth - 1) - __builtin_clz(a);
- rep_t result;
-
- // Shift a into the significand field, rounding if it is a right-shift
- if (exponent <= significandBits) {
- const int shift = significandBits - exponent;
- result = (rep_t)a << shift ^ implicitBit;
- } else {
- const int shift = exponent - significandBits;
- result = (rep_t)a >> shift ^ implicitBit;
- rep_t round = (rep_t)a << (typeWidth - shift);
- if (round > signBit) result++;
- if (round == signBit) result += result & 1;
- }
-
- // Insert the exponent
- result += (rep_t)(exponent + exponentBias) << significandBits;
- // Insert the sign bit and return
- return fromRep(result | sign);
-}