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76 lines
1.7 KiB
ArmAsm
76 lines
1.7 KiB
ArmAsm
/* Compute the hypothenuse of X and Y.
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Copyright (C) 1998-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <i386-math-asm.h>
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DEFINE_DBL_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%edx)
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#else
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# define MO(op) op
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#endif
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.text
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ENTRY(__ieee754_hypot)
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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fldl 4(%esp) // x
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fxam
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fnstsw
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fldl 12(%esp) // y : x
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movb %ah, %ch
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fxam
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fnstsw
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movb %ah, %al
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orb %ch, %ah
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sahf
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jc 1f
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fmul %st(0) // y * y : x
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fxch // x : y * y
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fmul %st(0) // x * x : y * y
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faddp // x * x + y * y
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fsqrt
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DBL_NARROW_EVAL_UFLOW_NONNEG
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2: ret
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// We have to test whether any of the parameters is Inf.
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// In this case the result is infinity.
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1: andb $0x45, %al
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cmpb $5, %al
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je 3f // jump if y is Inf
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andb $0x45, %ch
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cmpb $5, %ch
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jne 4f // jump if x is not Inf
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fxch
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3: fstp %st(1)
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fabs
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jmp 2b
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4: testb $1, %al
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jnz 5f // y is NaN
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fxch
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5: fstp %st(1)
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jmp 2b
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END(__ieee754_hypot)
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strong_alias (__ieee754_hypot, __hypot_finite)
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