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188 lines
3.6 KiB
NASM
188 lines
3.6 KiB
NASM
dnl PPC-64 mpn_divrem_2 -- Divide an mpn number by a normalized 2-limb number.
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dnl Copyright 2007, 2008 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP 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 General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C norm frac
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C POWER3/PPC630
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C POWER4/PPC970 ? ?
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C POWER5 37 ?
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C POWER6 62 ?
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C POWER6 30.5 ?
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C INPUT PARAMETERS
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C qp = r3
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C fn = r4
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C up = r5
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C un = r6
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C dp = r7
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ifdef(`DARWIN',,`
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define(`r2',`r31')') C FIXME!
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ASM_START()
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EXTERN_FUNC(mpn_invert_limb)
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PROLOGUE(mpn_divrem_2,toc)
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mflr r0
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std r23, -72(r1)
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std r24, -64(r1)
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std r25, -56(r1)
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std r26, -48(r1)
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std r27, -40(r1)
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std r28, -32(r1)
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std r29, -24(r1)
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std r30, -16(r1)
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std r31, -8(r1)
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std r0, 16(r1)
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stdu r1, -192(r1)
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mr r24, r3
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mr r25, r4
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sldi r0, r6, 3
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add r26, r5, r0
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addi r26, r26, -24
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ld r30, 8(r7)
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ld r28, 0(r7)
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ld r29, 16(r26)
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ld r31, 8(r26)
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ifelse(0,1,`
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li r23, 0
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cmpld cr7, r29, r30
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blt cr7, L(8)
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bgt cr7, L(9)
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cmpld cr0, r31, r28
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blt cr0, L(8)
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L(9): subfc r31, r28, r31
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subfe r29, r30, r29
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li r23, 1
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',`
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li r23, 0
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cmpld cr7, r29, r30
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blt cr7, L(8)
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mfcr r0
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rlwinm r0, r0, 30, 31, 31
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subfc r9, r28, r31
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addze. r0, r0
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nop
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beq cr0, L(8)
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subfc r31, r28, r31
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subfe r29, r30, r29
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li r23, 1
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')
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L(8):
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add r27, r25, r6
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addic. r27, r27, -3
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blt cr0, L(18)
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mr r3, r30
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CALL( mpn_invert_limb)
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mulld r10, r3, r30
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mulhdu r0, r3, r28
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addc r8, r10, r28
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subfe r11, r1, r1
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addc r10, r8, r0
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addze. r11, r11
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blt cr0, L(91)
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L(40):
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subfc r10, r30, r10
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addme. r11, r11
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addi r3, r3, -1
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bge cr0, L(40)
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L(91):
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addi r5, r27, 1
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mtctr r5
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sldi r0, r27, 3
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add r24, r24, r0
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ALIGN(16)
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L(loop):
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mulhdu r8, r29, r3
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mulld r6, r29, r3
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addc r6, r6, r31
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adde r8, r8, r29
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cmpd cr7, r27, r25
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mulld r0, r30, r8
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mulhdu r11, r28, r8
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mulld r10, r28, r8
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subf r31, r0, r31
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li r7, 0
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blt cr7, L(60)
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ld r7, 0(r26)
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addi r26, r26, -8
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nop
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L(60): subfc r7, r28, r7
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subfe r31, r30, r31
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subfc r7, r10, r7
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subfe r4, r11, r31
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subfc r9, r6, r4
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subfe r9, r1, r1
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andc r6, r28, r9
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andc r0, r30, r9
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addc r31, r7, r6
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adde r29, r4, r0
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subf r8, r9, r8
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cmpld cr7, r29, r30
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bge- cr7, L(fix)
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L(bck): std r8, 0(r24)
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addi r24, r24, -8
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addi r27, r27, -1
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bdnz L(loop)
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L(18):
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std r31, 8(r26)
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std r29, 16(r26)
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mr r3, r23
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addi r1, r1, 192
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ld r0, 16(r1)
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mtlr r0
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ld r23, -72(r1)
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ld r24, -64(r1)
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ld r25, -56(r1)
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ld r26, -48(r1)
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ld r27, -40(r1)
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ld r28, -32(r1)
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ld r29, -24(r1)
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ld r30, -16(r1)
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ld r31, -8(r1)
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blr
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L(fix):
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mfcr r0
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rlwinm r0, r0, 30, 31, 31
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subfc r9, r28, r31
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addze. r0, r0
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beq cr0, L(bck)
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subfc r31, r28, r31
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subfe r29, r30, r29
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addi r8, r8, 1
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b L(bck)
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EPILOGUE()
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