2009-08-18 18:36:21 -04:00
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dnl mpn_sub_err1_n
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dnl Copyright 2009 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The MPIR Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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2014-02-07 08:05:55 -05:00
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C ret mpn_sub_err1(mp_ptr rp,mp_ptr up,mp_ptr vp,mp_ptr ep,mp_ptr_t yp,mp_size_t n,mp_limb_t cy)
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C rax rdi, rsi, rdx, rcx, r8 r9 8(rsp)=>r10
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2009-08-18 18:36:21 -04:00
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ASM_START()
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PROLOGUE(mpn_sub_err1_n)
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2014-02-07 08:05:55 -05:00
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C if we rearrange the params we could save some moves
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C (rdi,r9)=(rsi,r9)+(rdx,r9) sum=carry*(r8)
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mov 8(%rsp),%r10 C cy
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mov %rbp,-16(%rsp) C save rbp
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lea -24(%rdi,%r9,8),%rdi C rp += n - 3
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mov %r12,-24(%rsp) C save r12
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mov %r13,-32(%rsp) C save r13
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lea -24(%rsi,%r9,8),%rsi C up += n - 3
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mov %r14,-40(%rsp) C save r14
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mov %r15,-48(%rsp) C save r15
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lea -24(%rdx,%r9,8),%rdx C vp += n - 3
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mov %rcx,-56(%rsp) C save rcx
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mov %rbx,-8(%rsp) C save rbx
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mov $3,%r11 C i = 3
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shl $63,%r10
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lea (%r8,%r9,8),%r8 C yp += n
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sub %r9,%r11 C i = 3 - n
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mov $0,%r9 C t1 = 0
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mov $0,%rax C t2 = 0
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mov $0,%rbx C t3 = 0
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jnc skiplp C if done goto skiplp
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2009-08-18 18:36:21 -04:00
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ALIGN(16)
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lp:
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2014-02-07 08:05:55 -05:00
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mov (%rsi,%r11,8),%r12 C s1 = *(up + i + 0)
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mov 8(%rsi,%r11,8),%r13 C s2 = *(up + i + 1)
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mov 16(%rsi,%r11,8),%r14 C s3 = *(up + i + 2)
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mov 24(%rsi,%r11,8),%r15 C s4 = *(up + i + 3)
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mov $0,%rbp C t5 = 0
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shl $1,%r10 C s1 -= *(vp + i + 0) + (cy & 1)
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sbb (%rdx,%r11,8),%r12
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cmovc -8(%r8),%rax C if borrow1, t2 = *(yp - 1)
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sbb 8(%rdx,%r11,8),%r13 C s2 -= *(vp + i + 1) + borrow1
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cmovc -16(%r8),%rbx C if borrow2 t3 = *(yp - 2)
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mov $0,%rcx C t4 = 0
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sbb 16(%rdx,%r11,8),%r14 C s3 -= *(vp + i + 2) + borrow2
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cmovc -24(%r8),%rcx C if borrow3 t4 = *(yp - 3)
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sbb 24(%rdx,%r11,8),%r15 C s4 -= *(vp + i + 3) + borrow3
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cmovc -32(%r8),%rbp C if borrow4 t5 = *(yp - 4)
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rcr $1,%r10 C high bit of cy = borrow
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add %rax,%r9 C t1 += t2
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adc $0,%r10 C accumulate cy
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add %rbx,%r9 C t1 += t2
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adc $0,%r10 C accumulate cy
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add %rcx,%r9 C t1 += t4
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mov $0,%rax C t2 = 0
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adc $0,%r10 C accumulate cy
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lea -32(%r8),%r8 C yp -= 4
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add %rbp,%r9 C t1 += t5
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adc $0,%r10 C accumulate cy
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mov %r12,(%rdi,%r11,8) C *(rp + i + 0) = s1
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mov %r13,8(%rdi,%r11,8) C *(rp + i + 1) = s2
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mov %r14,16(%rdi,%r11,8) C *(rp + i + 2) = s3
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mov %r15,24(%rdi,%r11,8) C *(rp + i + 3) = s4
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mov $0,%rbx C t3 = 0
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add $4,%r11 C i += 4
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jnc lp C not done, goto lp
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2009-08-18 18:36:21 -04:00
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skiplp:
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cmp $2,%r11 C cmp(i, 2)
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mov -16(%rsp),%rbp C restore rbp
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mov -48(%rsp),%r15 C restore r15
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ja case0 C i == 3 goto case0
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je case1 C i == 2 goto case1
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jp case2 C i == 1 goto case2
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2009-08-18 18:36:21 -04:00
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case3:
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mov (%rsi,%r11,8),%r12 C s1 = *(up + i + 0)
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mov 8(%rsi,%r11,8),%r13 C s2 = *(up + i + 1)
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mov 16(%rsi,%r11,8),%r14 C s3 = *(up + i + 2)
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shl $1,%r10 C restore borrow1 from high bit of t1
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sbb (%rdx,%r11,8),%r12 C s1 -= *(vp + i + 0) + borrow1
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cmovc -8(%r8),%rax C if borrow2 t2 = *(yp - 1)
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sbb 8(%rdx,%r11,8),%r13 C s2 -= *(vp + i + 1) + borrow2
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cmovc -16(%r8),%rbx C if borrow3 t3 = *(yp - 2)
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mov $0,%rcx C t4 = 0
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sbb 16(%rdx,%r11,8),%r14 C s3 -= *(vp + i + 3) + borrow3
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cmovc -24(%r8),%rcx C if borrow4 t4 = *(yp - 3)
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rcr $1,%r10 C store borrow4 in high bit of cy
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add %rax,%r9 C t1 += t2
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adc $0,%r10 C accumulate cy
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add %rbx,%r9 C t1 += t3
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adc $0,%r10 C accumulate cy
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add %rcx,%r9 C t1 += t4
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adc $0,%r10 C accumulate cy
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mov %r12,(%rdi,%r11,8) C *(rp + i + 0) = s1
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mov %r13,8(%rdi,%r11,8) C *(rp + i + 1) = s2
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mov %r14,16(%rdi,%r11,8) C *(rp + i + 2) = s3
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mov -56(%rsp),%rcx C restore rcx
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mov %r9,(%rcx) C ep[0] = t1
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btr $63,%r10 C retrieve borrow out and reset bit of cy
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mov %r10,8(%rcx) C ep[1] = cy
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mov -40(%rsp),%r14 C restore r14
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mov $0,%rax
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mov -32(%rsp),%r13 C restore r13
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adc $0,%rax C return borrow out
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mov -24(%rsp),%r12 C restore r12
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mov -8(%rsp),%rbx C restore rbx
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2009-08-18 18:36:21 -04:00
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ret
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ALIGN(16)
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case2:
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mov (%rsi,%r11,8),%r12 C s1 = *(up + i + 0)
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mov 8(%rsi,%r11,8),%r13 C s2 = *(up + i + 1)
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shl $1,%r10 C restore borrow1 from high bit of t1
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sbb (%rdx,%r11,8),%r12 C s1 -= *(vp + i + 0) + borrow1
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cmovc -8(%r8),%rax C if borrow2 t2 = *(yp - 1)
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sbb 8(%rdx,%r11,8),%r13 C s2 -= *(vp + i + 1) + borrow2
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cmovc -16(%r8),%rbx C if borrow3 t3 = *(yp - 2)
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rcr $1,%r10 C store borrow3 in high bit of cy
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add %rax,%r9 C t1 += t2
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adc $0,%r10 C accumulate cy
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add %rbx,%r9 C t1 += t3
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adc $0,%r10 C accumulate cy
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mov %r12,(%rdi,%r11,8) C *(rp + i + 0) = s1
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mov %r13,8(%rdi,%r11,8) C *(rp + i + 1) = s2
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mov -56(%rsp),%rcx C restore rcx
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mov %r9,(%rcx) C ep[0] = t1
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btr $63,%r10 C retrieve borrow out and reset bit of cy
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mov %r10,8(%rcx) C ep[1] = cy
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mov -40(%rsp),%r14 C restore r14
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2009-08-18 18:36:21 -04:00
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mov $0,%rax
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mov -32(%rsp),%r13 C restore r13
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adc $0,%rax C return borrow out
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mov -24(%rsp),%r12 C restore r12
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mov -8(%rsp),%rbx C restore rbx
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2009-08-18 18:36:21 -04:00
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ret
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ALIGN(16)
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case1:
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mov (%rsi,%r11,8),%r12 C s1 = *(up + i + 0)
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shl $1,%r10 C restore borrow1 from high bit of t1
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sbb (%rdx,%r11,8),%r12 C s1 -= *(vp + i + 0) + borrow1
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cmovc -8(%r8),%rax C if borrow2 t2 = *(yp - 1)
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rcr $1,%r10 C store borrow3 in high bit of cy
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add %rax,%r9 C t1 += t2
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adc $0,%r10 C accumulate cy
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mov %r12,(%rdi,%r11,8) C *(rp + i + 0) = s1
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case0: mov -56(%rsp),%rcx C restore rcx
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mov %r9,(%rcx) C ep[0] = t1
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btr $63,%r10 C retrieve borrow out and reset bit of cy
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mov %r10,8(%rcx) C ep[1] = cy
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mov -40(%rsp),%r14 C restore r14
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2009-08-18 18:36:21 -04:00
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mov $0,%rax
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2014-02-07 08:05:55 -05:00
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mov -32(%rsp),%r13 C restore r13
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adc $0,%rax C return borrow out
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mov -24(%rsp),%r12 C restore r12
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mov -8(%rsp),%rbx C restore rbx
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2009-08-18 18:36:21 -04:00
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ret
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EPILOGUE()
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