2013-11-22 12:38:45 +00:00
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/* PowerPC64 mpn_lshift -- mpn_add_n/mpn_sub_n -- mpn addition and
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subtraction.
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2015-01-02 16:28:19 +00:00
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Copyright (C) 2003-2015 Free Software Foundation, Inc.
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2013-11-22 12:38:45 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* cycles/limb
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* POWER7 2.18
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*/
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#ifdef USE_AS_SUB
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# define FUNC __mpn_sub_n
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# define ADDSUBC subfe
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#else
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# define FUNC __mpn_add_n
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# define ADDSUBC adde
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#endif
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#define RP r3
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#define UP r4
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#define VP r5
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#define N r6
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EALIGN(FUNC, 5, 0)
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#ifdef USE_AS_SUB
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addic r0, r0, 0
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#else
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addic r0, r1, -1
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#endif
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andi. r7, N, 1
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beq L(bx0)
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ld r7, 0(UP)
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ld r9, r0(VP)
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ADDSUBC r11, r9, r7
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std r11, r0(RP)
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cmpldi N, N, 1
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beq N, L(end)
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addi UP, UP, 8
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addi VP, VP, 8
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addi RP, RP, 8
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L(bx0): addi r0, N, 2
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srdi r0, r0, 2
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mtctr r0
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andi. r7, N, 2
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bne L(mid)
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addi UP, UP, 16
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addi VP, VP, 16
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addi RP, RP, 16
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.align 5
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L(top): ld r6, -16(UP)
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ld r7, -8(UP)
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ld r8, -16(VP)
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ld r9, -8(VP)
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ADDSUBC r10, r8, N
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ADDSUBC r11, r9, r7
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std r10, -16(RP)
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std r11, -8(RP)
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L(mid): ld r6, 0(UP)
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ld r7, 8(UP)
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ld r8, 0(VP)
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ld r9, 8(VP)
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ADDSUBC r10, r8, N
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ADDSUBC r11, r9, r7
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std r10, 0(RP)
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std r11, 8(RP)
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addi UP, UP, 32
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addi VP, VP, 32
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addi RP, RP, 32
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bdnz L(top)
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L(end): subfe r3, r0, r0
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#ifdef USE_AS_SUB
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neg r3, r3
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#else
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addi r3, r3, 1
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#endif
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blr
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END(FUNC)
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