--- /dev/null
+dnl Alpha mpn_addlsh1_n/mpn_sublsh1_n -- rp[] = up[] +- (vp[] << 1).
+
+dnl Copyright 2003 Free Software 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 EV4: 12.5
+C EV5: 6.25
+C EV6: 4.375 (i.e., worse than separate mpn_lshift and mpn_add_n at 3.875)
+
+C TODO
+C * Write special version for ev6, as this is a slowdown for 100 < n < 2200
+C compared to separate mpn_lshift and mpn_add_n.
+C * Use addq instead of sll for left shift, and similarly cmplt instead of srl
+C for right shift.
+
+dnl INPUT PARAMETERS
+define(`rp',`r16')
+define(`up',`r17')
+define(`vp',`r18')
+define(`n', `r19')
+
+define(`u0', `r8')
+define(`u1', `r1')
+define(`u2', `r2')
+define(`u3', `r3')
+define(`v0', `r4')
+define(`v1', `r5')
+define(`v2', `r6')
+define(`v3', `r7')
+
+define(`cy0', `r0')
+define(`cy1', `r20')
+define(`cy', `r22')
+define(`rr', `r24')
+define(`ps', `r25')
+define(`sl', `r28')
+
+ifdef(`OPERATION_addlsh1_n',`
+ define(ADDSUB, addq)
+ define(CARRY, `cmpult $1,$2,$3')
+ define(func, mpn_addlsh1_n)
+')
+ifdef(`OPERATION_sublsh1_n',`
+ define(ADDSUB, subq)
+ define(CARRY, `cmpult $2,$1,$3')
+ define(func, mpn_sublsh1_n)
+')
+
+MULFUNC_PROLOGUE(mpn_addlsh1_n mpn_sublsh1_n)
+
+ASM_START()
+PROLOGUE(func)
+ lda n, -4(n)
+ bis r31, r31, cy1
+ and n, 3, r1
+ beq r1, $Lb00
+ cmpeq r1, 1, r2
+ bne r2, $Lb01
+ cmpeq r1, 2, r2
+ bne r2, $Lb10
+$Lb11: C n = 3, 7, 11, ...
+ ldq v0, 0(vp)
+ ldq u0, 0(up)
+ ldq v1, 8(vp)
+ ldq u1, 8(up)
+ ldq v2, 16(vp)
+ ldq u2, 16(up)
+ lda vp, 24(vp)
+ lda up, 24(up)
+ bge n, $Loop
+ br r31, $Lcj3
+$Lb10: C n = 2, 6, 10, ...
+ bis r31, r31, cy0
+ ldq v1, 0(vp)
+ ldq u1, 0(up)
+ ldq v2, 8(vp)
+ ldq u2, 8(up)
+ lda rp, -8(rp)
+ blt n, $Lcj2
+ ldq v3, 16(vp)
+ ldq u3, 16(up)
+ lda vp, 48(vp)
+ lda up, 16(up)
+ br r31, $LL10
+$Lb01: C n = 1, 5, 9, ...
+ ldq v2, 0(vp)
+ ldq u2, 0(up)
+ lda rp, -16(rp)
+ blt n, $Lcj1
+ ldq v3, 8(vp)
+ ldq u3, 8(up)
+ ldq v0, 16(vp)
+ ldq u0, 16(up)
+ lda vp, 40(vp)
+ lda up, 8(up)
+ lda rp, 32(rp)
+ br r31, $LL01
+$Lb00: C n = 4, 8, 12, ...
+ bis r31, r31, cy0
+ ldq v3, 0(vp)
+ ldq u3, 0(up)
+ ldq v0, 8(vp)
+ ldq u0, 8(up)
+ ldq v1, 16(vp)
+ ldq u1, 16(up)
+ lda vp, 32(vp)
+ lda rp, 8(rp)
+ br r31, $LL00x
+ ALIGN(16)
+C 0
+$Loop: sll v0, 1, sl C left shift vlimb
+ ldq v3, 0(vp)
+C 1
+ ADDSUB u0, sl, ps C ulimb + (vlimb << 1)
+ ldq u3, 0(up)
+C 2
+ ADDSUB ps, cy1, rr C consume carry from previous operation
+ srl v0, 63, cy0 C carry out #1
+C 3
+ CARRY( ps, u0, cy) C carry out #2
+ stq rr, 0(rp)
+C 4
+ addq cy, cy0, cy0 C combine carry out #1 and #2
+ CARRY( rr, ps, cy) C carry out #3
+C 5
+ addq cy, cy0, cy0 C final carry out
+ lda vp, 32(vp) C bookkeeping
+C 6
+$LL10: sll v1, 1, sl
+ ldq v0, -24(vp)
+C 7
+ ADDSUB u1, sl, ps
+ ldq u0, 8(up)
+C 8
+ ADDSUB ps, cy0, rr
+ srl v1, 63, cy1
+C 9
+ CARRY( ps, u1, cy)
+ stq rr, 8(rp)
+C 10
+ addq cy, cy1, cy1
+ CARRY( rr, ps, cy)
+C 11
+ addq cy, cy1, cy1
+ lda rp, 32(rp) C bookkeeping
+C 12
+$LL01: sll v2, 1, sl
+ ldq v1, -16(vp)
+C 13
+ ADDSUB u2, sl, ps
+ ldq u1, 16(up)
+C 14
+ ADDSUB ps, cy1, rr
+ srl v2, 63, cy0
+C 15
+ CARRY( ps, u2, cy)
+ stq rr, -16(rp)
+C 16
+ addq cy, cy0, cy0
+ CARRY( rr, ps, cy)
+C 17
+ addq cy, cy0, cy0
+$LL00x: lda up, 32(up) C bookkeeping
+C 18
+ sll v3, 1, sl
+ ldq v2, -8(vp)
+C 19
+ ADDSUB u3, sl, ps
+ ldq u2, -8(up)
+C 20
+ ADDSUB ps, cy0, rr
+ srl v3, 63, cy1
+C 21
+ CARRY( ps, u3, cy)
+ stq rr, -8(rp)
+C 22
+ addq cy, cy1, cy1
+ CARRY( rr, ps, cy)
+C 23
+ addq cy, cy1, cy1
+ lda n, -4(n) C bookkeeping
+C 24
+ bge n, $Loop
+
+$Lcj3: sll v0, 1, sl
+ ADDSUB u0, sl, ps
+ ADDSUB ps, cy1, rr
+ srl v0, 63, cy0
+ CARRY( ps, u0, cy)
+ stq rr, 0(rp)
+ addq cy, cy0, cy0
+ CARRY( rr, ps, cy)
+ addq cy, cy0, cy0
+
+$Lcj2: sll v1, 1, sl
+ ADDSUB u1, sl, ps
+ ADDSUB ps, cy0, rr
+ srl v1, 63, cy1
+ CARRY( ps, u1, cy)
+ stq rr, 8(rp)
+ addq cy, cy1, cy1
+ CARRY( rr, ps, cy)
+ addq cy, cy1, cy1
+
+$Lcj1: sll v2, 1, sl
+ ADDSUB u2, sl, ps
+ ADDSUB ps, cy1, rr
+ srl v2, 63, cy0
+ CARRY( ps, u2, cy)
+ stq rr, 16(rp)
+ addq cy, cy0, cy0
+ CARRY( rr, ps, cy)
+ addq cy, cy0, cy0
+
+ ret r31,(r26),1
+EPILOGUE()
+ASM_END()
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