@ Tremolo library
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@-----------------------------------------------------------------------
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@ Copyright (C) 2002-2009, Xiph.org Foundation
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@ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd
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@ All rights reserved.
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@ Redistribution and use in source and binary forms, with or without
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@ modification, are permitted provided that the following conditions
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@ are met:
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@ * Redistributions of source code must retain the above copyright
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@ notice, this list of conditions and the following disclaimer.
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@ * Redistributions in binary form must reproduce the above
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@ copyright notice, this list of conditions and the following disclaimer
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@ in the documentation and/or other materials provided with the
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@ distribution.
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@ * Neither the names of the Xiph.org Foundation nor Pinknoise
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@ Productions Ltd nor the names of its contributors may be used to
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@ endorse or promote products derived from this software without
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@ specific prior written permission.
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@
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@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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@ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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@ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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@ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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@ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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@ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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@ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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@ ----------------------------------------------------------------------
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.text
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.global render_lineARM
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render_lineARM:
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@ r0 = n
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@ r1 = d
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@ r2 = floor
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@ r3 = base
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@ <> = err
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@ <> = adx
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@ <> = ady
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MOV r12,r13
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STMFD r13!,{r4-r6,r11,r14}
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LDMFD r12,{r11,r12,r14} @ r11 = err
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@ r12 = adx
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@ r14 = ady
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rl_loop:
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LDR r4,[r1] @ r4 = *d
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LDR r5,[r2],r3,LSL #2 @ r5 = *floor r2 = floor+base
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SUBS r11,r11,r14 @ err -= ady
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ADDLT r11,r11,r12 @ if (err < 0) err+=adx
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SMULL r6, r5, r4, r5 @ (r6,r5) = *d * *floor
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ADDLT r2, r2, #4 @ floor+=1
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MOVS r6, r6, LSR #15
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ADC r5, r6, r5, LSL #17 @ r5 = MULT31_SHIFT15
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STR r5,[r1],#4
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SUBS r0, r0, #1
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BGT rl_loop
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LDMFD r13!,{r4-r6,r11,PC}
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@ END
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