mirror of
https://github.com/corda/corda.git
synced 2024-12-28 16:58:55 +00:00
f978eab8d1
git-subtree-dir: sgx-jvm/linux-sgx git-subtree-mainline:d52accb52cgit-subtree-split:2df43c54f3
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
//===-- lib/floatsitf.c - integer -> quad-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 quad-precision conversion for the
|
|
// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
|
|
// mode.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define QUAD_PRECISION
|
|
#include "fp_lib.h"
|
|
|
|
#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
|
|
COMPILER_RT_ABI fp_t __floatsitf(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;
|
|
unsigned aAbs = (unsigned)a;
|
|
if (a < 0) {
|
|
sign = signBit;
|
|
aAbs += 0x80000000;
|
|
}
|
|
|
|
// 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 and clear the implicit bit. Extra
|
|
// cast to unsigned int is necessary to get the correct behavior for
|
|
// the input INT_MIN.
|
|
const int shift = significandBits - exponent;
|
|
result = (rep_t)aAbs << shift ^ implicitBit;
|
|
|
|
// Insert the exponent
|
|
result += (rep_t)(exponent + exponentBias) << significandBits;
|
|
// Insert the sign bit and return
|
|
return fromRep(result | sign);
|
|
}
|
|
|
|
#endif
|