projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5624e564 | 1 | ; Copyright (C) 2011-2015 Free Software Foundation, Inc. |
| 85b8555e DD |
2 | ; Contributed by Red Hat. |
| 3 | ; | |
| 4 | ; This file is free software; you can redistribute it and/or modify it | |
| 5 | ; under the terms of the GNU General Public License as published by the | |
| 6 | ; Free Software Foundation; either version 3, or (at your option) any | |
| 7 | ; later version. | |
| 8 | ; | |
| 9 | ; This file is distributed in the hope that it will be useful, but | |
| 10 | ; WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | ; General Public License for more details. | |
| 13 | ; | |
| 14 | ; Under Section 7 of GPL version 3, you are granted additional | |
| 15 | ; permissions described in the GCC Runtime Library Exception, version | |
| 16 | ; 3.1, as published by the Free Software Foundation. | |
| 17 | ; | |
| 18 | ; You should have received a copy of the GNU General Public License and | |
| 19 | ; a copy of the GCC Runtime Library Exception along with this program; | |
| 20 | ; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 21 | ; <http://www.gnu.org/licenses/>. | |
| 22 | ||
| 5c0029de | 23 | #include "vregs.h" |
| 85b8555e DD |
24 | |
| 25 | .text | |
| 26 | .global ___lshrsi3 | |
| 27 | .type ___lshrsi3, @function | |
| 28 | ___lshrsi3: | |
| 29 | ||
| 30 | ;; input: | |
| 31 | ;; | |
| 32 | ;; [zero] | |
| 33 | ;; [count] <= $sp+8 | |
| 34 | ;; [in MSB] | |
| 35 | ;; [in] | |
| 36 | ;; [in] | |
| 37 | ;; [in LSB] <- $sp+4 | |
| 38 | ||
| 39 | ;; output: | |
| 40 | ;; | |
| 41 | ;; [r8..r11] result | |
| 42 | ||
| 43 | ;; registers: | |
| 44 | ;; | |
| 45 | ;; AX - temp for shift/rotate | |
| 46 | ;; B - count | |
| 47 | ||
| 48 | mov a, [sp+8] ; A now contains the count | |
| 49 | ||
| 50 | cmp a, #0x20 | |
| 51 | bc $.Lcount_is_normal | |
| 52 | ||
| 53 | ;; count is out of bounds, just return zero. | |
| 54 | movw r8, #0 | |
| 55 | movw r10, #0 | |
| 56 | ret | |
| 57 | ||
| 58 | .Lcount_is_normal: | |
| 59 | cmp0 a | |
| 60 | bnz $.Lcount_is_nonzero | |
| 61 | ||
| 62 | ;; count is zero, just copy IN to OUT | |
| 63 | movw ax, [sp+4] | |
| 64 | movw r8, ax | |
| 65 | movw ax, [sp+6] | |
| 66 | movw r10, ax | |
| 67 | ret | |
| 68 | ||
| 69 | .Lcount_is_nonzero: | |
| 70 | mov b, a ; B now contains the count also | |
| 71 | bf a.4, $.Lcount_lt_16 | |
| 72 | ||
| 73 | ;; count >= 16, shift 16 at a time. | |
| 74 | movw r10, #0 | |
| 75 | movw ax, [sp+6] | |
| 76 | movw r8, ax | |
| 77 | mov a, b | |
| 78 | and a, #0x0f | |
| 79 | sknz | |
| 80 | ret | |
| 81 | ||
| 82 | mov b, a ; B now contains the remaining count | |
| 83 | inc b | |
| 84 | br $.Lloop_top | |
| 85 | ||
| 86 | .Lcount_lt_16: | |
| 87 | ;; count is nonzero. Do one | |
| 88 | movw ax, [sp+6] | |
| 89 | shrw ax,1 | |
| 90 | movw r10, ax | |
| 91 | mov a, [sp+5] | |
| 92 | rorc a,1 | |
| 93 | mov r9, a | |
| 94 | mov a, [sp+4] | |
| 95 | rorc a,1 | |
| 96 | mov r8, a | |
| 97 | ||
| 98 | ;; we did one shift above; do as many more as we need now. | |
| 99 | .Lloop_top: | |
| 100 | dec b | |
| 101 | sknz | |
| 102 | ret | |
| 103 | ||
| 104 | movw ax, r10 | |
| 105 | shrw ax,1 | |
| 106 | movw r10, ax | |
| 107 | mov a, r9 | |
| 108 | rorc a,1 | |
| 109 | mov r9, a | |
| 110 | mov a, r8 | |
| 111 | rorc a,1 | |
| 112 | mov r8, a | |
| 113 | ||
| 114 | br $.Lloop_top | |
| 115 | ||
| 116 | .size ___lshrsi3, .-___lshrsi3 |