Loading...
gdtoa/_ldbl_util.c Libc-1725.40.4 /dev/null
--- Libc/Libc-1725.40.4/gdtoa/_ldbl_util.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright (c) 2004, 2008 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http:www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- * 
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <sys/cdefs.h>
-#include <stdint.h>
-#include <strings.h>
-#include <float.h>
-#include <math.h>
-
-#include "fpmath.h"
-
-#define	BITS64		64
-#define	DBL_BIAS	(DBL_MAX_EXP - 1)
-#define	DBL_SUBEXP	(-DBL_BIAS + 1)
-#define	LL_BITS		(8 * sizeof(int64_t))
-#define	LL_HIGHBIT	(1LL << 63)
-
-__private_extern__ int
-_ldbl2array32dd(union IEEEl2bits u, uint32_t *a)
-{
-	int bit, shift, highbit, dexp;
-	uint64_t a64[2];
-	int64_t t64;
-	int extrabit = 0;
-
-	if(u.d[0] == 0.0) {
-	    a[0] = a[1] = a[2] = a[3] = 0;
-	    return 0;
-	}
-
-	bzero(a64, sizeof(a64));
-
-	switch (__fpclassifyd(u.d[0])) {
-	case FP_NORMAL:
-		/*
-		 * special case: if the head double only has the high (hidden)
-		 * bit set, and the tail double is non-zero and is opposite
-		 * in sign, then we increment extrabit to keep 106 bit
-		 * precision in the results.
-		 */
-		if(u.bits.manh == 0 && u.d[1] != 0 && u.bits.sign != u.bits.sign2)
-		    extrabit++;
-		a64[1] = (1LL << (LDBL_MANT_DIG - BITS64 - 1 + extrabit));
-		a64[1] |= ((uint64_t)u.bits.manh >> (BITS64 - LDBL_MANL_SIZE - extrabit));
-		a64[0] = ((uint64_t)u.bits.manh << (LDBL_MANL_SIZE + extrabit));
-		break;
-	case FP_SUBNORMAL:
-		a64[1] |= ((uint64_t)u.bits.manh >> (BITS64 - LDBL_MANL_SIZE));
-		a64[0] = ((uint64_t)u.bits.manh << LDBL_MANL_SIZE);
-		/* the tail double will be zero, so we are done */
-		goto done;
-	default:
-		goto done;
-	}
-
-	dexp = (int)u.bits.exp - (int)u.bits.exp2;
-	/*
-	 * if the tail double is so small to not fit in LDBL_MANT_DIG bits,
-	 * then just skip it.
-	 */
-	if (dexp >= LDBL_MANT_DIG + extrabit) {
-		reshift:
-		if (extrabit) {
-			bit = a64[1] & 1;
-			a64[1] >>= 1;
-			a64[0] >>= 1;
-			a64[0] |= ((uint64_t)bit) << (BITS64 - 1);
-			extrabit = 0;
-		}
-		goto done;
-	}
-
-	switch (__fpclassifyd(u.d[1])) {
-	case FP_NORMAL:
-		bit = LDBL_MANT_DIG - dexp - 1 + extrabit;
-		t64 = (1LL << bit);
-		break;
-	case FP_SUBNORMAL:
-		bit = LDBL_MANT_DIG - (int)u.bits.exp + extrabit;
-		t64 = 0;
-		break;
-	default:
-		/* should never get here */
-		goto reshift;
-	}
-	shift = LDBL_MANL_SIZE - bit - 1;
-	if (shift >= 0)
-		t64 |= (u.bits.manl >> shift);
-	else
-		t64 |= (u.bits.manl << (-shift));
-	highbit = ((a64[0] & LL_HIGHBIT) != 0);
-	if (u.bits.sign == u.bits.sign2) {
-		a64[0] += t64;
-		if (highbit && !(a64[0] & LL_HIGHBIT))	/* carry */
-			a64[1]++;
-	} else {
-		a64[0] -= t64;
-		if (!highbit && (a64[0] & LL_HIGHBIT))	/* borrow */
-			a64[1]--;
-	}
-
-	done:
-	a[0] = (uint32_t)a64[0];
-	a[1] = (uint32_t)(a64[0] >> 32);
-	a[2] = (uint32_t)a64[1];
-	a[3] = (uint32_t)(a64[1] >> 32);
-	return extrabit;
-}