--- /dev/null
+dnl PowerPC-64 mpn_invert_limb -- Invert a normalized limb.
+
+dnl Copyright 2004, 2005, 2006, 2008 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 POWER3/PPC630: ?
+C POWER4/PPC970: 75 (including call+ret)
+
+C TODO:
+C * Pair multiply instructions.
+
+ASM_START()
+PROLOGUE(mpn_invert_limb)
+ LEAL( r12, approx_tab)
+
+ srdi r11, r3, 32 C r11 = d >> 32
+ rlwinm r9, r11, 10, 23, 30 C r9 = ((d >> 55) & 0xff) << 1
+ lhzx r0, r12, r9 C load initial approximation
+ rldic r10, r0, 6, 42
+ mulld r8, r10, r10
+ sldi r9, r10, 17
+ mulld r0, r8, r11
+ srdi r0, r0, 31
+ subf r10, r0, r9
+ mulld r8, r10, r10
+ sldi r11, r10, 33
+ mulhdu r0, r8, r3
+ sldi r9, r0, 1
+ subf r10, r9, r11
+ sldi r11, r10, 2
+ mulhdu r0, r10, r10
+ mulld r8, r10, r10
+ mulhdu r10, r8, r3
+ mulld r9, r0, r3
+ mulhdu r0, r0, r3
+ addc r8, r9, r10
+ addze r10, r0
+ srdi r0, r8, 62
+ rldimi r0, r10, 2, 0
+ sldi r9, r8, 2
+ subfic r10, r9, 0
+ subfe r8, r0, r11
+ mulhdu r10, r3, r8
+ add r10, r10, r3
+ mulld r9, r3, r8
+ subf r11, r10, r8
+ addi r0, r10, 1
+ addi r8, r11, -1
+ and r0, r3, r0
+ addc r11, r9, r0
+ addze r10, r10
+ addc r0, r11, r3
+ addze r10, r10
+ subf r3, r10, r8
+ blr
+EPILOGUE()
+
+DEF_OBJECT(approx_tab)
+ .short 1023,1020,1016,1012,1008,1004,1000,996
+ .short 992,989,985,981,978,974,970,967
+ .short 963,960,956,953,949,946,942,939
+ .short 936,932,929,926,923,919,916,913
+ .short 910,907,903,900,897,894,891,888
+ .short 885,882,879,876,873,870,868,865
+ .short 862,859,856,853,851,848,845,842
+ .short 840,837,834,832,829,826,824,821
+ .short 819,816,814,811,809,806,804,801
+ .short 799,796,794,791,789,787,784,782
+ .short 780,777,775,773,771,768,766,764
+ .short 762,759,757,755,753,751,748,746
+ .short 744,742,740,738,736,734,732,730
+ .short 728,726,724,722,720,718,716,714
+ .short 712,710,708,706,704,702,700,699
+ .short 697,695,693,691,689,688,686,684
+ .short 682,680,679,677,675,673,672,670
+ .short 668,667,665,663,661,660,658,657
+ .short 655,653,652,650,648,647,645,644
+ .short 642,640,639,637,636,634,633,631
+ .short 630,628,627,625,624,622,621,619
+ .short 618,616,615,613,612,611,609,608
+ .short 606,605,604,602,601,599,598,597
+ .short 595,594,593,591,590,589,587,586
+ .short 585,583,582,581,579,578,577,576
+ .short 574,573,572,571,569,568,567,566
+ .short 564,563,562,561,560,558,557,556
+ .short 555,554,553,551,550,549,548,547
+ .short 546,544,543,542,541,540,539,538
+ .short 537,536,534,533,532,531,530,529
+ .short 528,527,526,525,524,523,522,521
+ .short 520,519,518,517,516,515,514,513
+END_OBJECT(approx_tab)
+ASM_END()
projects / msp430-gcc.git / blobdiff