--- /dev/null
+dnl Alpha EV5 __gmpn_rshift -- Shift a number right.
+
+dnl Copyright (C) 1994, 1995, 2000 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 by
+dnl the Free Software Foundation; either version 2.1 of the License, or (at your
+dnl 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; see the file COPYING.LIB. If not, write to
+dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+dnl MA 02111-1307, USA.
+
+include(`../config.m4')
+
+dnl INPUT PARAMETERS
+dnl res_ptr r16
+dnl s1_ptr r17
+dnl size r18
+dnl cnt r19
+
+dnl This code runs at 3.25 cycles/limb on the EV5.
+
+ASM_START()
+PROLOGUE(mpn_rshift)
+ ldq r4,0(r17) C load first limb
+ subq r31,r19,r20
+ subq r18,1,r18
+ and r18,4-1,r28 C number of limbs in first loop
+ sll r4,r20,r0 C compute function result
+
+ beq r28,$L0
+ subq r18,r28,r18
+
+ ALIGN(8)
+$Loop0: ldq r3,8(r17)
+ addq r16,8,r16
+ srl r4,r19,r5
+ addq r17,8,r17
+ subq r28,1,r28
+ sll r3,r20,r6
+ bis r3,r3,r4
+ bis r5,r6,r8
+ stq r8,-8(r16)
+ bne r28,$Loop0
+
+$L0: srl r4,r19,r24
+ beq r18,$Lend
+C warm up phase 1
+ ldq r1,8(r17)
+ subq r18,4,r18
+ ldq r2,16(r17)
+ ldq r3,24(r17)
+ ldq r4,32(r17)
+ beq r18,$Lend1
+C warm up phase 2
+ sll r1,r20,r7
+ srl r1,r19,r21
+ sll r2,r20,r8
+ ldq r1,40(r17)
+ srl r2,r19,r22
+ ldq r2,48(r17)
+ sll r3,r20,r5
+ bis r7,r24,r7
+ srl r3,r19,r23
+ bis r8,r21,r8
+ sll r4,r20,r6
+ ldq r3,56(r17)
+ srl r4,r19,r24
+ ldq r4,64(r17)
+ subq r18,4,r18
+ beq r18,$Lend2
+ ALIGN(16)
+C main loop
+$Loop: stq r7,0(r16)
+ bis r5,r22,r5
+ stq r8,8(r16)
+ bis r6,r23,r6
+
+ sll r1,r20,r7
+ subq r18,4,r18
+ srl r1,r19,r21
+ unop C ldq r31,-96(r17)
+
+ sll r2,r20,r8
+ ldq r1,72(r17)
+ srl r2,r19,r22
+ ldq r2,80(r17)
+
+ stq r5,16(r16)
+ bis r7,r24,r7
+ stq r6,24(r16)
+ bis r8,r21,r8
+
+ sll r3,r20,r5
+ unop C ldq r31,-96(r17)
+ srl r3,r19,r23
+ addq r16,32,r16
+
+ sll r4,r20,r6
+ ldq r3,88(r17)
+ srl r4,r19,r24
+ ldq r4,96(r17)
+
+ addq r17,32,r17
+ bne r18,$Loop
+C cool down phase 2/1
+$Lend2: stq r7,0(r16)
+ bis r5,r22,r5
+ stq r8,8(r16)
+ bis r6,r23,r6
+ sll r1,r20,r7
+ srl r1,r19,r21
+ sll r2,r20,r8
+ srl r2,r19,r22
+ stq r5,16(r16)
+ bis r7,r24,r7
+ stq r6,24(r16)
+ bis r8,r21,r8
+ sll r3,r20,r5
+ srl r3,r19,r23
+ sll r4,r20,r6
+ srl r4,r19,r24
+C cool down phase 2/2
+ stq r7,32(r16)
+ bis r5,r22,r5
+ stq r8,40(r16)
+ bis r6,r23,r6
+ stq r5,48(r16)
+ stq r6,56(r16)
+C cool down phase 2/3
+ stq r24,64(r16)
+ ret r31,(r26),1
+
+C cool down phase 1/1
+$Lend1: sll r1,r20,r7
+ srl r1,r19,r21
+ sll r2,r20,r8
+ srl r2,r19,r22
+ sll r3,r20,r5
+ bis r7,r24,r7
+ srl r3,r19,r23
+ bis r8,r21,r8
+ sll r4,r20,r6
+ srl r4,r19,r24
+C cool down phase 1/2
+ stq r7,0(r16)
+ bis r5,r22,r5
+ stq r8,8(r16)
+ bis r6,r23,r6
+ stq r5,16(r16)
+ stq r6,24(r16)
+ stq r24,32(r16)
+ ret r31,(r26),1
+
+$Lend: stq r24,0(r16)
+ ret r31,(r26),1
+EPILOGUE(mpn_rshift)
+ASM_END()
projects / ghc-hetmet.git / blobdiff