addmul_1.asm
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上传日期:2022-08-06
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- dnl PowerPC-32 mpn_addmul_1 -- Multiply a limb vector with a limb and add the
- dnl result to a second limb vector.
- dnl Copyright 1995, 1997, 1998, 2000, 2001, 2002, 2003, 2005 Free Software
- dnl Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C cycles/limb
- C 603e: ?
- C 604e: 6.75
- C 75x (G3): 8.7-14.3
- C 7400,7410 (G4): 8.7-14.3
- C 744x,745x (G4+): 9.5
- C power4/ppc970: 6.25
- C power5: 6.25
- C INPUT PARAMETERS
- C rp r3
- C up r4
- C n r5
- C vl r6
- C This is optimized for the PPC604. It has not been tuned for other
- C PowerPC processors.
- C
- C Loop Analysis for the 604:
- C 12 mem insn
- C 8 serializing insn
- C 8 int multiply
- C 25 int reg write
- C 9 int ops (8 of which serialize)
- C
- C The multiply insns need 16 cycles/4limb.
- C The integer register writes will need 13 cycles/4limb.
- C All-in-all, it should be possible to get to 4 or 5 cycles/limb on PPC604,
- C but that will require some clever FPNOPS and BNOPS for exact
- C issue control.
- ASM_START()
- PROLOGUE(mpn_addmul_1)
- cmpwi cr0,r5,9 C more than 9 limbs?
- bgt cr0,L(big) C branch if more than 9 limbs
- mtctr r5
- lwz r0,0(r4)
- mullw r7,r0,r6
- mulhwu r10,r0,r6
- lwz r9,0(r3)
- addc r8,r7,r9
- addi r3,r3,-4
- bdz L(end)
- L(loop):
- lwzu r0,4(r4)
- stwu r8,4(r3)
- mullw r8,r0,r6
- adde r7,r8,r10
- mulhwu r10,r0,r6
- lwz r9,4(r3)
- addze r10,r10
- addc r8,r7,r9
- bdnz L(loop)
- L(end): stw r8,4(r3)
- addze r3,r10
- blr
- L(big): stmw r30,-32(r1)
- addi r5,r5,-1
- srwi r0,r5,2
- mtctr r0
- lwz r7,0(r4)
- mullw r8,r7,r6
- mulhwu r0,r7,r6
- lwz r7,0(r3)
- addc r8,r8,r7
- stw r8,0(r3)
- L(loopU):
- lwz r7,4(r4)
- lwz r12,8(r4)
- lwz r30,12(r4)
- lwzu r31,16(r4)
- mullw r8,r7,r6
- mullw r9,r12,r6
- mullw r10,r30,r6
- mullw r11,r31,r6
- adde r8,r8,r0 C add cy_limb
- mulhwu r0,r7,r6
- lwz r7,4(r3)
- adde r9,r9,r0
- mulhwu r0,r12,r6
- lwz r12,8(r3)
- adde r10,r10,r0
- mulhwu r0,r30,r6
- lwz r30,12(r3)
- adde r11,r11,r0
- mulhwu r0,r31,r6
- lwz r31,16(r3)
- addze r0,r0 C new cy_limb
- addc r8,r8,r7
- stw r8,4(r3)
- adde r9,r9,r12
- stw r9,8(r3)
- adde r10,r10,r30
- stw r10,12(r3)
- adde r11,r11,r31
- stwu r11,16(r3)
- bdnz L(loopU)
- andi. r31,r5,3
- mtctr r31
- beq cr0,L(endx)
- L(loopE):
- lwzu r7,4(r4)
- mullw r8,r7,r6
- adde r8,r8,r0 C add cy_limb
- mulhwu r0,r7,r6
- lwz r7,4(r3)
- addze r0,r0 C new cy_limb
- addc r8,r8,r7
- stwu r8,4(r3)
- bdnz L(loopE)
- L(endx):
- addze r3,r0
- lmw r30,-32(r1)
- blr
- EPILOGUE(mpn_addmul_1)