84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
139 lines
4.6 KiB
ArmAsm
139 lines
4.6 KiB
ArmAsm
/* $NetBSD: n_cabs.S,v 1.6 2008/03/20 16:41:26 mhitch Exp $ */
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/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)cabs.s 8.1 (Berkeley) 6/4/93
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*/
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#include <machine/asm.h>
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.globl _C_LABEL(__libm_dsqrt_r5)
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/*
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* double precision complex absolute value
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* CABS by W. Kahan, 9/7/80.
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* Revised for reserved operands by E. LeBlanc, 8/18/82
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* argument for complex absolute value by reference, *4(%ap)
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* argument for cabs and hypot (C fcns) by value, 4(%ap)
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* output is in %r0:%r1 (error less than 0.86 ulps)
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*/
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/* entry for c functions cabs and hypot */
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(hypotf, _hypotf)
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#endif
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ENTRY(_hypotf, 0)
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cvtfd 4(%ap),-(%sp)
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calls $2,_C_LABEL(_hypot)
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cvtdf %r0,%r0
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ret
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(hypot, _hypot)
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#endif
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ALTENTRY(cabs)
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ENTRY(_hypot, 0x8040) # save %r6, enable floating overflow
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movq 4(%ap),%r0 # %r0:1 = x
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movq 12(%ap),%r2 # %r2:3 = y
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jbr cabs2
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/* entry for Fortran use, call by: d = abs(z) */
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ENTRY(z_abs, 0x8040) # save %r6, enable floating overflow
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movl 4(%ap),%r2 # indirect addressing is necessary here
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movq (%r2)+,%r0 # %r0:1 = x
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movq (%r2),%r2 # %r2:3 = y
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cabs2:
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bicw3 $0x7f,%r0,%r4 # %r4 has signed biased exp of x
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cmpw $0x8000,%r4
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jeql return # x is a reserved operand, so return it
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bicw3 $0x7f,%r2,%r5 # %r5 has signed biased exp of y
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cmpw $0x8000,%r5
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jneq cont /* y isn't a reserved operand */
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movq %r2,%r0 /* return y if it's reserved */
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ret
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cont:
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bsbb regs_set # %r0:1 = dsqrt(x^2+y^2)/2^%r6
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addw2 %r6,%r0 # unscaled cdabs in %r0:1
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jvc return # unless it overflows
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subw2 $0x80,%r0 # halve %r0 to get meaningful overflow
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addd2 %r0,%r0 # overflow; %r0 is half of true abs value
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return:
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ret
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ENTRY(__libm_cdabs_r6,0) # ENTRY POINT for cdsqrt
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# calculates a scaled (factor in %r6)
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# complex absolute value
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movq (%r4)+,%r0 # %r0:%r1 = x via indirect addressing
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movq (%r4),%r2 # %r2:%r3 = y via indirect addressing
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bicw3 $0x7f,%r0,%r5 # %r5 has signed biased exp of x
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cmpw $0x8000,%r5
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jeql cdreserved # x is a reserved operand
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bicw3 $0x7f,%r2,%r5 # %r5 has signed biased exp of y
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cmpw $0x8000,%r5
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jneq regs_set /* y isn't a reserved operand either? */
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cdreserved:
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movl *4(%ap),%r4 # %r4 -> (u,v), if x or y is reserved
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movq %r0,(%r4)+ # copy u and v as is and return
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movq %r2,(%r4) # (again addressing is indirect)
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ret
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regs_set:
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bicw2 $0x8000,%r0 # %r0:%r1 = dabs(x)
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bicw2 $0x8000,%r2 # %r2:%r3 = dabs(y)
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cmpw %r0,%r2
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jgeq ordered
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movq %r0,%r4
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movq %r2,%r0
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movq %r4,%r2 # force y's exp <= x's exp
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ordered:
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bicw3 $0x7f,%r0,%r6 # %r6 = exponent(x) + bias(129)
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jeql retsb # if x = y = 0 then cdabs(x,y) = 0
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subw2 $0x4780,%r6 # %r6 = exponent(x) - 14
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subw2 %r6,%r0 # 2^14 <= scaled x < 2^15
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bitw $0xff80,%r2
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jeql retsb # if y = 0 return dabs(x)
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subw2 %r6,%r2
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cmpw $0x3780,%r2 # if scaled y < 2^-18
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jgtr retsb # return dabs(x)
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emodd %r0,$0,%r0,%r4,%r0 # %r4 + %r0:1 = scaled x^2
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emodd %r2,$0,%r2,%r5,%r2 # %r5 + %r2:3 = scaled y^2
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addd2 %r2,%r0
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addl2 %r5,%r4
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cvtld %r4,%r2
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addd2 %r2,%r0 # %r0:1 = scaled x^2 + y^2
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jmp _C_LABEL(__libm_dsqrt_r5)+2
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# %r0:1 = dsqrt(x^2+y^2)/2^%r6
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retsb:
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rsb # error < 0.86 ulp
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