diff options
Diffstat (limited to 'lib/libc/sparc64/fpu/fpu_compare.c')
| -rw-r--r-- | lib/libc/sparc64/fpu/fpu_compare.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/lib/libc/sparc64/fpu/fpu_compare.c b/lib/libc/sparc64/fpu/fpu_compare.c deleted file mode 100644 index 84b00bf..0000000 --- a/lib/libc/sparc64/fpu/fpu_compare.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * Copyright (c) 1992, 1993 - * The Regents of the University of California. All rights reserved. - * - * This software was developed by the Computer Systems Engineering group - * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and - * contributed to Berkeley. - * - * All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Lawrence Berkeley Laboratory. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)fpu_compare.c 8.1 (Berkeley) 6/11/93 - * $NetBSD: fpu_compare.c,v 1.3 2001/08/26 05:46:31 eeh Exp $ - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -/* - * CMP and CMPE instructions. - * - * These rely on the fact that our internal wide format is achieved by - * adding zero bits to the end of narrower mantissas. - */ - -#include <sys/types.h> - -#include <machine/frame.h> -#include <machine/fp.h> -#include <machine/fsr.h> - -#include "fpu_arith.h" -#include "fpu_emu.h" -#include "fpu_extern.h" - -static u_long fcc_nmask[] = { - ~FSR_FCC0_MASK, - ~FSR_FCC1_MASK, - ~FSR_FCC2_MASK, - ~FSR_FCC3_MASK -}; - -/* XXX: we don't use the FSR_FCCx macros here; it's much easier this way. */ -static int fcc_shift[] = { - FSR_FCC0_SHIFT, - FSR_FCC1_SHIFT, - FSR_FCC2_SHIFT, - FSR_FCC3_SHIFT -}; - -/* - * Perform a compare instruction (with or without unordered exception). - * This updates the fcc field in the fsr. - * - * If either operand is NaN, the result is unordered. For cmpe, this - * causes an NV exception. Everything else is ordered: - * |Inf| > |numbers| > |0|. - * We already arranged for fp_class(Inf) > fp_class(numbers) > fp_class(0), - * so we get this directly. Note, however, that two zeros compare equal - * regardless of sign, while everything else depends on sign. - * - * Incidentally, two Infs of the same sign compare equal (per the 80387 - * manual---it would be nice if the SPARC documentation were more - * complete). - */ -void -__fpu_compare(struct fpemu *fe, int cmpe, int fcc) -{ - struct fpn *a, *b; - int cc; - FPU_DECL_CARRY - - a = &fe->fe_f1; - b = &fe->fe_f2; - - if (ISNAN(a) || ISNAN(b)) { - /* - * In any case, we already got an exception for signalling - * NaNs; here we may replace that one with an identical - * exception, but so what?. - */ - if (cmpe) - fe->fe_cx = FSR_NV; - cc = FSR_CC_UO; - goto done; - } - - /* - * Must handle both-zero early to avoid sign goofs. Otherwise, - * at most one is 0, and if the signs differ we are done. - */ - if (ISZERO(a) && ISZERO(b)) { - cc = FSR_CC_EQ; - goto done; - } - if (a->fp_sign) { /* a < 0 (or -0) */ - if (!b->fp_sign) { /* b >= 0 (or if a = -0, b > 0) */ - cc = FSR_CC_LT; - goto done; - } - } else { /* a > 0 (or +0) */ - if (b->fp_sign) { /* b <= -0 (or if a = +0, b < 0) */ - cc = FSR_CC_GT; - goto done; - } - } - - /* - * Now the signs are the same (but may both be negative). All - * we have left are these cases: - * - * |a| < |b| [classes or values differ] - * |a| > |b| [classes or values differ] - * |a| == |b| [classes and values identical] - * - * We define `diff' here to expand these as: - * - * |a| < |b|, a,b >= 0: a < b => FSR_CC_LT - * |a| < |b|, a,b < 0: a > b => FSR_CC_GT - * |a| > |b|, a,b >= 0: a > b => FSR_CC_GT - * |a| > |b|, a,b < 0: a < b => FSR_CC_LT - */ -#define opposite_cc(cc) ((cc) == FSR_CC_LT ? FSR_CC_GT : FSR_CC_LT) -#define diff(magnitude) (a->fp_sign ? opposite_cc(magnitude) : (magnitude)) - if (a->fp_class < b->fp_class) { /* |a| < |b| */ - cc = diff(FSR_CC_LT); - goto done; - } - if (a->fp_class > b->fp_class) { /* |a| > |b| */ - cc = diff(FSR_CC_GT); - goto done; - } - /* now none can be 0: only Inf and numbers remain */ - if (ISINF(a)) { /* |Inf| = |Inf| */ - cc = FSR_CC_EQ; - goto done; - } - /* - * Only numbers remain. To compare two numbers in magnitude, we - * simply subtract them. - */ - a = __fpu_sub(fe); - if (a->fp_class == FPC_ZERO) - cc = FSR_CC_EQ; - else - cc = diff(FSR_CC_GT); - -done: - fe->fe_fsr = (fe->fe_fsr & fcc_nmask[fcc]) | - ((u_long)cc << fcc_shift[fcc]); -} |
