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/* PowerPC64 __mpn_addmul_1 -- Multiply a limb vector with a limb and add
the result to a second limb vector.
Copyright (C) 1999-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#ifdef USE_AS_SUBMUL
# define FUNC __mpn_submul_1
# define ADDSUBC subfe
# define ADDSUB subfc
#else
# define FUNC __mpn_addmul_1
# define ADDSUBC adde
# define ADDSUB addc
#endif
#define RP r3
#define UP r4
#define N r5
#define VL r6
#define R27SAVE (-40)
#define R28SAVE (-32)
#define R29SAVE (-24)
#define R30SAVE (-16)
#define R31SAVE (-8)
ENTRY_TOCLESS (FUNC, 5)
std r31, R31SAVE(r1)
rldicl. r0, N, 0, 62
std r30, R30SAVE(r1)
cmpdi VL, r0, 2
std r29, R29SAVE(r1)
addi N, N, 3
std r28, R28SAVE(r1)
srdi N, N, 2
std r27, R27SAVE(r1)
cfi_offset(r31, R31SAVE)
cfi_offset(r30, R30SAVE)
cfi_offset(r29, R29SAVE)
cfi_offset(r28, R28SAVE)
cfi_offset(r27, R27SAVE)
mtctr N
beq cr0, L(b00)
blt cr6, L(b01)
beq cr6, L(b10)
L(b11): ld r9, 0(UP)
ld r28, 0(RP)
mulld r0, r9, VL
mulhdu r12, r9, VL
ADDSUB r0, r0, r28
std r0, 0(RP)
addi RP, RP, 8
ld r9, 8(UP)
ld r27, 16(UP)
addi UP, UP, 24
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
#endif
b L(bot)
.align 4
L(b00): ld r9, 0(UP)
ld r27, 8(UP)
ld r28, 0(RP)
ld r29, 8(RP)
mulld r0, r9, VL
mulhdu N, r9, VL
mulld r7, r27, VL
mulhdu r8, r27, VL
addc r7, r7, N
addze r12, r8
ADDSUB r0, r0, r28
std r0, 0(RP)
ADDSUBC r7, r7, r29
std r7, 8(RP)
addi RP, RP, 16
ld r9, 16(UP)
ld r27, 24(UP)
addi UP, UP, 32
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
#endif
b L(bot)
.align 4
L(b01): bdnz L(gt1)
ld r9, 0(UP)
ld r11, 0(RP)
mulld r0, r9, VL
mulhdu r8, r9, VL
ADDSUB r0, r0, r11
std r0, 0(RP)
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
addic r11, r11, 1
#endif
addze RP, r8
blr
L(gt1): ld r9, 0(UP)
ld r27, 8(UP)
mulld r0, r9, VL
mulhdu N, r9, VL
mulld r7, r27, VL
mulhdu r8, r27, VL
ld r9, 16(UP)
ld r28, 0(RP)
ld r29, 8(RP)
ld r30, 16(RP)
mulld r11, r9, VL
mulhdu r10, r9, VL
addc r7, r7, N
adde r11, r11, r8
addze r12, r10
ADDSUB r0, r0, r28
std r0, 0(RP)
ADDSUBC r7, r7, r29
std r7, 8(RP)
ADDSUBC r11, r11, r30
std r11, 16(RP)
addi RP, RP, 24
ld r9, 24(UP)
ld r27, 32(UP)
addi UP, UP, 40
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
#endif
b L(bot)
L(b10): addic r0, r0, r0
li r12, 0
ld r9, 0(UP)
ld r27, 8(UP)
bdz L(end)
addi UP, UP, 16
.align 4
L(top): mulld r0, r9, VL
mulhdu N, r9, VL
mulld r7, r27, VL
mulhdu r8, r27, VL
ld r9, 0(UP)
ld r28, 0(RP)
ld r27, 8(UP)
ld r29, 8(RP)
adde r0, r0, r12
adde r7, r7, N
mulld N, r9, VL
mulhdu r10, r9, VL
mulld r11, r27, VL
mulhdu r12, r27, VL
ld r9, 16(UP)
ld r30, 16(RP)
ld r27, 24(UP)
ld r31, 24(RP)
adde N, N, r8
adde r11, r11, r10
addze r12, r12
ADDSUB r0, r0, r28
std r0, 0(RP)
ADDSUBC r7, r7, r29
std r7, 8(RP)
ADDSUBC N, N, r30
std N, 16(RP)
ADDSUBC r11, r11, r31
std r11, 24(RP)
addi UP, UP, 32
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
#endif
addi RP, RP, 32
L(bot):
#ifdef USE_AS_SUBMUL
addic r11, r11, 1
#endif
bdnz L(top)
L(end): mulld r0, r9, VL
mulhdu N, r9, VL
mulld r7, r27, VL
mulhdu r8, r27, VL
ld r28, 0(RP)
ld r29, 8(RP)
adde r0, r0, r12
adde r7, r7, N
addze r8, r8
ADDSUB r0, r0, r28
std r0, 0(RP)
ADDSUBC r7, r7, r29
std r7, 8(RP)
#ifdef USE_AS_SUBMUL
subfe r11, r11, r11
addic r11, r11, 1
#endif
addze RP, r8
ld r31, R31SAVE(r1)
ld r30, R30SAVE(r1)
ld r29, R29SAVE(r1)
ld r28, R28SAVE(r1)
ld r27, R27SAVE(r1)
blr
END(FUNC)
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