2010-09-04 16:26:53 -04:00
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dnl AMD64 mpn_sub_err1_n
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2009-07-23 23:12:09 -04:00
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dnl Copyright (C) 2009, David Harvey
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dnl All rights reserved.
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dnl Redistribution and use in source and binary forms, with or without
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dnl modification, are permitted provided that the following conditions are
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dnl met:
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dnl 1. Redistributions of source code must retain the above copyright notice,
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dnl this list of conditions and the following disclaimer.
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dnl 2. Redistributions in binary form must reproduce the above copyright
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dnl notice, this list of conditions and the following disclaimer in the
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dnl documentation and/or other materials provided with the distribution.
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dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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dnl PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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dnl HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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dnl TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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include(`../config.m4')
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C cycles/limb
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C K8,K9: 3.166
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C K10: ?
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C P4: ?
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C P6-15 (Core2): ?
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C P6-28 (Atom): ?
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C INPUT PARAMETERS
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define(`rp', `%rdi')
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define(`up', `%rsi')
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define(`vp', `%rdx')
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define(`ep', `%rcx')
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define(`yp', `%r8')
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define(`n', `%r9')
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define(`cy_param', `8(%rsp)')
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define(`el', `%rbx')
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define(`eh', `%rbp')
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define(`t0', `%r10')
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define(`t1', `%r11')
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define(`w', `%r12')
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ASM_START()
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TEXT
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ALIGN(16)
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2010-09-04 16:26:53 -04:00
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PROLOGUE(mpn_sub_err1_n)
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2009-07-23 23:12:09 -04:00
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mov cy_param, %rax
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push %rbx
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push %rbp
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push %r12
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xor el, el
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xor eh, eh
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lea (rp,n,8), rp
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lea (up,n,8), up
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lea (vp,n,8), vp
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test $1, n
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jnz L(odd)
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L(even):
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lea -8(yp,n,8), yp
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neg n
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jmp L(top)
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ALIGN(16)
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L(odd):
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lea -16(yp,n,8), yp
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neg n
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shr $1, %rax
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mov (up,n,8), w
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sbb (vp,n,8), w
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cmovc 8(yp), el
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mov w, (rp,n,8)
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setc %al
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inc n
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jz L(end)
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ALIGN(16)
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L(top):
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mov (up,n,8), w
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shr $1, %rax C restore carry
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sbb (vp,n,8), w
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mov $0, t1
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mov w, (rp,n,8)
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mov $0, t0
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mov 8(up,n,8), w
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cmovc (yp), t0
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sbb 8(vp,n,8), w
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cmovc -8(yp), t1
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setc %al C save carry
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add t0, el
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adc $0, eh
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add t1, el
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mov w, 8(rp,n,8)
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adc $0, eh
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add $2, n
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lea -16(yp), yp
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jnz L(top)
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L(end):
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mov el, (ep)
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mov eh, 8(ep)
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pop %r12
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pop %rbp
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pop %rbx
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ret
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EPILOGUE()
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