mirror of
https://github.com/autc04/Retro68.git
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69 lines
2.4 KiB
ArmAsm
69 lines
2.4 KiB
ArmAsm
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/*
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Copyright (c) 2013-2014 Andes Technology Corporation.
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All rights reserved.
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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 are met:
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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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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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The name of the company may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND 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 ARE
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DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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.text
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.align 1
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.global sqrt
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.type sqrt, @function
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sqrt:
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/* The input argument is supposed to be stored in $fd0.
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The return value is supposed to be stored in $fd0 either. */
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/* Clear the IEEE cumulative exceptions flags. ($fpcsr.b[6:2]) */
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FMFCSR $r0
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bitci $r0, $r0, #0b1111100
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FMTCSR $r0
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fsqrtd $fd0, $fd0
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/* Check the IEEE cumulative exceptions flags. */
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FMFCSR $r0
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bmski33 $r0, #2 /* Is $fpcsr.IVO('b2) set ? */
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bnez $r0, .L_EDOM /* Set errno as EDOM. */
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bmski33 $r0, #4 /* Is $fpcsr.OVF('b4) set ? */
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bnez $r0, .L_ERANGE /* Set errno as ERANGE. */
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bmski33 $r0, #5 /* Is $fpcsr.UDF('b5) set ? */
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bnez $r0, .L_ERANGE /* Set errno as ERANGE. */
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/* No error at all. Just ret. */
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ret
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.L_EDOM:
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movi $r0, #33 /* EDOM: Math arg out of domain of func. */
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j .L_Set_errno
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.L_ERANGE:
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movi $r0, #34 /* ERANGE: Math result not representable. */
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.L_Set_errno:
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l.w $r15, _impure_ptr
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swi $r0, [$r15] /* Set errno. */
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ret
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.size sqrt, .-sqrt
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