Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1 | @ Tremolo library |
Gloria Wang | 2da723a | 2010-03-18 15:56:16 -0700 | [diff] [blame] | 2 | @----------------------------------------------------------------------- |
| 3 | @ Copyright (C) 2002-2009, Xiph.org Foundation |
| 4 | @ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd |
| 5 | @ All rights reserved. |
| 6 | |
| 7 | @ Redistribution and use in source and binary forms, with or without |
| 8 | @ modification, are permitted provided that the following conditions |
| 9 | @ are met: |
| 10 | |
| 11 | @ * Redistributions of source code must retain the above copyright |
| 12 | @ notice, this list of conditions and the following disclaimer. |
| 13 | @ * Redistributions in binary form must reproduce the above |
| 14 | @ copyright notice, this list of conditions and the following disclaimer |
| 15 | @ in the documentation and/or other materials provided with the |
| 16 | @ distribution. |
| 17 | @ * Neither the names of the Xiph.org Foundation nor Pinknoise |
| 18 | @ Productions Ltd nor the names of its contributors may be used to |
| 19 | @ endorse or promote products derived from this software without |
| 20 | @ specific prior written permission. |
| 21 | @ |
| 22 | @ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 | @ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 | @ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 | @ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 26 | @ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | @ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 28 | @ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 29 | @ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 30 | @ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | @ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 32 | @ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | @ ---------------------------------------------------------------------- |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 34 | |
| 35 | .text |
| 36 | |
| 37 | .global render_lineARM |
| 38 | |
| 39 | render_lineARM: |
| 40 | @ r0 = n |
| 41 | @ r1 = d |
| 42 | @ r2 = floor |
| 43 | @ r3 = base |
| 44 | @ <> = err |
| 45 | @ <> = adx |
| 46 | @ <> = ady |
| 47 | MOV r12,r13 |
| 48 | STMFD r13!,{r4-r6,r11,r14} |
| 49 | LDMFD r12,{r11,r12,r14} @ r11 = err |
| 50 | @ r12 = adx |
| 51 | @ r14 = ady |
| 52 | rl_loop: |
| 53 | LDR r4,[r1] @ r4 = *d |
| 54 | LDR r5,[r2],r3,LSL #2 @ r5 = *floor r2 = floor+base |
| 55 | SUBS r11,r11,r14 @ err -= ady |
| 56 | ADDLT r11,r11,r12 @ if (err < 0) err+=adx |
| 57 | SMULL r6, r5, r4, r5 @ (r6,r5) = *d * *floor |
| 58 | ADDLT r2, r2, #4 @ floor+=1 |
| 59 | MOVS r6, r6, LSR #15 |
| 60 | ADC r5, r6, r5, LSL #17 @ r5 = MULT31_SHIFT15 |
| 61 | STR r5,[r1],#4 |
| 62 | SUBS r0, r0, #1 |
| 63 | BGT rl_loop |
| 64 | |
| 65 | LDMFD r13!,{r4-r6,r11,PC} |
| 66 | |
| 67 | @ END |