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@ ScummVM - Graphic Adventure Engine
@
@ ScummVM is the legal property of its developers, whose names
@ are too numerous to list here. Please refer to the COPYRIGHT
@ file distributed with this source distribution.
@
@ This program is free software@ you can redistribute it and/or
@ modify it under the terms of the GNU General Public License
@ as published by the Free Software Foundation@ either version 2
@ of the License, or (at your option) any later version.
@
@ This program is distributed in the hope that it will be useful,
@ but WITHOUT ANY WARRANTY@ without even the implied warranty of
@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
@ GNU General Public License for more details.
@
@ You should have received a copy of the GNU General Public License
@ along with this program@ if not, write to the Free Software
@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
@
@ $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/sound/rate_arm_asm.s $
@ $Id: rate_arm_asm.s 50964 2010-07-17 18:41:38Z fingolfin $
@
@ @author Robin Watts (robin@wss.co.uk)
@
@ This file, together with rate_arm.cpp, provides an ARM optimised version
@ of rate.cpp. The algorithm is essentially the same as that within rate.cpp
@ so to understand this file you should understand rate.cpp first.

        .text

        .global _ARM_CopyRate_M
        .global _ARM_CopyRate_S
        .global _ARM_CopyRate_R
        .global _ARM_SimpleRate_M
        .global _ARM_SimpleRate_S
        .global _ARM_SimpleRate_R
        .global _ARM_LinearRate_M
        .global _ARM_LinearRate_S
        .global _ARM_LinearRate_R

_ARM_CopyRate_M:
        @ r0 = len
        @ r1 = obuf
        @ r2 = vol_l
        @ r3 = vol_r
        @ <> = ptr
        LDR r12,[r13]
        STMFD r13!,{r4-r7,r14}

        MOV r14,#0 @ r14= 0
        ORR r2, r2, r2, LSL #8 @ r2 = vol_l as 16 bits
        ORR r3, r3, r3, LSL #8 @ r3 = vol_r as 16 bits
CopyRate_M_loop:
        LDRSH r5, [r12], #2 @ r5 = tmp0 = tmp1 = *ptr++
        LDRSH r6, [r1] @ r6 = obuf[0]
        LDRSH r7, [r1, #2] @ r7 = obuf[1]
        MUL r4, r2, r5 @ r4 = tmp0*vol_l
        MUL r5, r3, r5 @ r5 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r14,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r14,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r1], #2 @ Store output value
        STRH r7, [r1], #2 @ Store output value

        SUBS r0,r0,#1 @ len--
        BGT CopyRate_M_loop @ and loop

MOV r0, r1 @ return obuf

        LDMFD r13!,{r4-r7,PC}

_ARM_CopyRate_S:
        @ r0 = len
        @ r1 = obuf
        @ r2 = vol_l
        @ r3 = vol_r
        @ <> = ptr
        LDR r12,[r13]
        STMFD r13!,{r4-r7,r14}

        MOV r14,#0 @ r14= 0
        ORR r2, r2, r2, LSL #8 @ r2 = vol_l as 16 bits
        ORR r3, r3, r3, LSL #8 @ r3 = vol_r as 16 bits
CopyRate_S_loop:
        LDRSH r4, [r12],#2 @ r4 = tmp0 = *ptr++
        LDRSH r5, [r12],#2 @ r5 = tmp1 = *ptr++
        LDRSH r6, [r1] @ r6 = obuf[0]
        LDRSH r7, [r1,#2] @ r7 = obuf[1]
        MUL r4, r2, r4 @ r5 = tmp0*vol_l
        MUL r5, r3, r5 @ r6 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r14,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r14,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r1],#2 @ Store output value
        STRH r7, [r1],#2 @ Store output value

        SUBS r0,r0,#2 @ len -= 2
        BGT CopyRate_S_loop @ and loop

MOV r0, r1 @ return obuf

        LDMFD r13!,{r4-r7,PC}

_ARM_CopyRate_R:
        @ r0 = len
        @ r1 = obuf
        @ r2 = vol_l
        @ r3 = vol_r
        @ <> = ptr
        LDR r12,[r13]
        STMFD r13!,{r4-r7,r14}

        MOV r14,#0 @ r14= 0
        ORR r2, r2, r2, LSL #8 @ r2 = vol_l as 16 bits
        ORR r3, r3, r3, LSL #8 @ r3 = vol_r as 16 bits
CopyRate_R_loop:
        LDRSH r5, [r12],#2 @ r5 = tmp1 = *ptr++
        LDRSH r4, [r12],#2 @ r4 = tmp0 = *ptr++
        LDRSH r6, [r1] @ r6 = obuf[0]
        LDRSH r7, [r1,#2] @ r7 = obuf[1]
        MUL r4, r2, r4 @ r4 = tmp0*vol_l
        MUL r5, r3, r5 @ r5 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r14,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r14,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r1],#2 @ Store output value
        STRH r7, [r1],#2 @ Store output value

        SUBS r0,r0,#2 @ len -= 2
        BGT CopyRate_R_loop @ and loop

MOV r0, r1 @ return obuf

        LDMFD r13!,{r4-r7,PC}

_ARM_SimpleRate_M:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r2,r4-r8,r10-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r2,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r2 = opos
                                        @ r8 = opos_inc
        CMP r11,#0 @ if (osamp <= 0)
        BLE SimpleRate_M_end @ bale
        MOV r10,#0
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
SimpleRate_M_loop:
        SUBS r1, r1, #1 @ r1 = inLen -= 1
        BLT SimpleRate_M_read
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #2 @ if (r2 >= 0) { sr.inPtr++
        BGE SimpleRate_M_loop @ and loop }
SimpleRate_M_read_return:
        LDRSH r5, [r0],#2 @ r5 = tmp1 = *inPtr++
        LDRSH r6, [r3] @ r6 = obuf[0]
        LDRSH r7, [r3,#2] @ r7 = obuf[1]
        ADD r2, r2, r8 @ r2 = opos += opos_inc
        MUL r4, r12,r5 @ r4 = tmp0*vol_l
        MUL r5, r14,r5 @ r5 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r10,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r10,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r3],#2 @ Store output value
        STRH r7, [r3],#2 @ Store output value

        SUBS r11,r11,#1 @ len--
        BGT SimpleRate_M_loop @ and loop
SimpleRate_M_end:
        LDR r14,[r13,#8] @ r14 = sr
        ADD r13,r13,#12 @ Skip over r0-r2 on stack
        STMIA r14,{r0,r1,r2} @ Store back updated values

MOV r0, r3 @ return obuf

        LDMFD r13!,{r4-r8,r10-r11,PC}
SimpleRate_M_read:
        LDR r0, [r13,#8] @ r0 = sr (8 = 4*2)
        ADD r0, r0, #16 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}

        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 3+8+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #1 @ r1 = inLen-1
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT SimpleRate_M_end
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #2 @ if (r2 >= 0) { sr.inPtr++
        BGE SimpleRate_M_loop @ and loop }
        B SimpleRate_M_read_return


_ARM_SimpleRate_S:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r2,r4-r8,r10-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r2,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r2 = opos
                                        @ r8 = opos_inc
        CMP r11,#0 @ if (osamp <= 0)
        BLE SimpleRate_S_end @ bale
        MOV r10,#0
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
SimpleRate_S_loop:
        SUBS r1, r1, #2 @ r1 = inLen -= 2
        BLT SimpleRate_S_read
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #4 @ if (r2 >= 0) { sr.inPtr += 2
        BGE SimpleRate_S_loop @ and loop }
SimpleRate_S_read_return:
        LDRSH r4, [r0],#2 @ r4 = tmp0 = *inPtr++
        LDRSH r5, [r0],#2 @ r5 = tmp1 = *inPtr++
        LDRSH r6, [r3] @ r6 = obuf[0]
        LDRSH r7, [r3,#2] @ r7 = obuf[1]
        ADD r2, r2, r8 @ r2 = opos += opos_inc
        MUL r4, r12,r4 @ r5 = tmp0*vol_l
        MUL r5, r14,r5 @ r6 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r10,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r10,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r3],#2 @ Store output value
        STRH r7, [r3],#2 @ Store output value

        SUBS r11,r11,#1 @ osamp--
        BGT SimpleRate_S_loop @ and loop
SimpleRate_S_end:
        LDR r14,[r13,#8] @ r14 = sr
        ADD r13,r13,#12 @ skip over r0-r2 on stack
        STMIA r14,{r0,r1,r2} @ store back updated values
MOV r0, r3 @ return obuf
        LDMFD r13!,{r4-r8,r10-r11,PC}
SimpleRate_S_read:
        LDR r0, [r13,#8] @ r0 = sr (8 = 4*2)
        ADD r0, r0, #16 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}
        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 3+8+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #2 @ r1 = inLen-2
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT SimpleRate_S_end
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #4 @ if (r2 >= 0) { sr.inPtr += 2
        BGE SimpleRate_S_loop @ and loop }
        B SimpleRate_S_read_return



_ARM_SimpleRate_R:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r2,r4-r8,r10-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r2,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r2 = opos
                                        @ r8 = opos_inc
        CMP r11,#0 @ if (osamp <= 0)
        BLE SimpleRate_R_end @ bale
        MOV r10,#0
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
SimpleRate_R_loop:
        SUBS r1, r1, #2 @ r1 = inLen -= 2
        BLT SimpleRate_R_read
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #4 @ if (r2 >= 0) { sr.inPtr += 2
        BGE SimpleRate_R_loop @ and loop }
SimpleRate_R_read_return:
        LDRSH r5, [r0],#2 @ r5 = tmp0 = *inPtr++
        LDRSH r4, [r0],#2 @ r4 = tmp1 = *inPtr++
        LDRSH r6, [r3] @ r6 = obuf[0]
        LDRSH r7, [r3,#2] @ r7 = obuf[1]
        ADD r2, r2, r8 @ r2 = opos += opos_inc
        MUL r4, r12,r4 @ r5 = tmp0*vol_l
        MUL r5, r14,r5 @ r6 = tmp1*vol_r

        ADDS r6, r4, r6, LSL #16 @ r6 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r6, r10,#0x80000000 @ Clamp r6
        ADDS r7, r5, r7, LSL #16 @ r7 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r7, r10,#0x80000000 @ Clamp r7

        MOV r6, r6, LSR #16 @ Shift back to halfword
        MOV r7, r7, LSR #16 @ Shift back to halfword

        STRH r6, [r3],#2 @ Store output value
        STRH r7, [r3],#2 @ Store output value

        SUBS r11,r11,#1 @ osamp--
        BGT SimpleRate_R_loop @ and loop
SimpleRate_R_end:
        LDR r14,[r13,#8] @ r14 = sr
        ADD r13,r13,#12 @ Skip over r0-r2 on stack
        STMIA r14,{r0,r1,r2} @ Store back updated values
MOV r0, r3 @ return obuf
        LDMFD r13!,{r4-r8,r10-r11,PC}
SimpleRate_R_read:
        LDR r0, [r13,#8] @ r0 = sr (8 = 4*2)
        ADD r0, r0, #16 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}

        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 3+8+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #2 @ r1 = inLen-2
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT SimpleRate_R_end
        SUBS r2, r2, #1 @ r2 = opos--
        ADDGE r0, r0, #4 @ if (r2 >= 0) { sr.inPtr += 2
        BGE SimpleRate_R_loop @ and loop }
        B SimpleRate_R_read_return


_ARM_LinearRate_M:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r1,r4-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r8 = opos
        MOV r10,#0
        CMP r11,#0 @ if (osamp <= 0)
        BLE LinearRate_M_end @ bale
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
        CMP r1,#0
        BGT LinearRate_M_part2

        @ part1 - read input samples
LinearRate_M_loop:
        SUBS r1, r1, #1 @ r1 = inLen -= 1
        BLT LinearRate_M_read
LinearRate_M_read_return:
        LDRH r4, [r2, #16] @ r4 = icur[0]
        LDRSH r5, [r0],#2 @ r5 = tmp1 = *inPtr++
        SUBS r8, r8, #65536 @ r8 = opos--
        STRH r4, [r2,#22] @ ilast[0] = icur[0]
        STRH r5, [r2,#16] @ icur[0] = tmp1
        BGE LinearRate_M_loop

        @ part2 - form output samples
LinearRate_M_part2:
        @ We are guaranteed that opos < 0 here
        LDR r6, [r2,#20] @ r6 = ilast[0]<<16 + 32768
        LDRSH r5, [r2,#16] @ r5 = icur[0]
        MOV r4, r8, LSL #16
        MOV r4, r4, LSR #16
        SUB r5, r5, r6, ASR #16 @ r5 = icur[0] - ilast[0]
        MLA r6, r4, r5, r6 @ r6 = (icur[0]-ilast[0])*opos_frac+ilast[0]

        LDRSH r4, [r3] @ r4 = obuf[0]
        LDRSH r5, [r3,#2] @ r5 = obuf[1]
        MOV r6, r6, ASR #16 @ r6 = tmp0 = tmp1 >>= 16
        MUL r7, r12,r6 @ r7 = tmp0*vol_l
        MUL r6, r14,r6 @ r6 = tmp1*vol_r

        ADDS r7, r7, r4, LSL #16 @ r7 = obuf[0]<<16 + tmp0*vol_l
        RSCVS r7, r10, #0x80000000 @ Clamp r7
        ADDS r6, r6, r5, LSL #16 @ r6 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r6, r10, #0x80000000 @ Clamp r6

        MOV r7, r7, LSR #16 @ Shift back to halfword
        MOV r6, r6, LSR #16 @ Shift back to halfword

        LDR r5, [r2,#12] @ r5 = opos_inc
        STRH r7, [r3],#2 @ Store output value
        STRH r6, [r3],#2 @ Store output value
        SUBS r11, r11,#1 @ osamp--
        BLE LinearRate_M_end @ end if needed

        ADDS r8, r8, r5 @ r8 = opos += opos_inc
        BLT LinearRate_M_part2
        B LinearRate_M_loop
LinearRate_M_end:
        ADD r13,r13,#8
        STMIA r2,{r0,r1,r8}
MOV r0, r3 @ return obuf
        LDMFD r13!,{r4-r11,PC}
LinearRate_M_read:
        ADD r0, r2, #28 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}

        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 2+9+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #1 @ r1 = inLen-1
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT LinearRate_M_end
        B LinearRate_M_read_return

_ARM_LinearRate_S:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r1,r4-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r8 = opos
        CMP r11,#0 @ if (osamp <= 0)
        BLE LinearRate_S_end @ bale
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
        CMP r1,#0
        BGT LinearRate_S_part2

        @ part1 - read input samples
LinearRate_S_loop:
        SUBS r1, r1, #2 @ r1 = inLen -= 2
        BLT LinearRate_S_read
LinearRate_S_read_return:
        LDR r10,[r2, #16] @ r10= icur[0,1]
        LDRSH r5, [r0],#2 @ r5 = tmp0 = *inPtr++
        LDRSH r6, [r0],#2 @ r5 = tmp1 = *inPtr++
        SUBS r8, r8, #65536 @ r8 = opos--
        STRH r10,[r2,#22] @ ilast[0] = icur[0]
        MOV r10,r10,LSR #16
        STRH r10,[r2,#26] @ ilast[1] = icur[1]
        STRH r5, [r2,#16] @ icur[0] = tmp0
        STRH r6, [r2,#18] @ icur[1] = tmp1
        BGE LinearRate_S_loop

        @ part2 - form output samples
LinearRate_S_part2:
        @ We are guaranteed that opos < 0 here
        LDR r6, [r2,#20] @ r6 = ilast[0]<<16 + 32768
        LDRSH r5, [r2,#16] @ r5 = icur[0]
        MOV r4, r8, LSL #16
        MOV r4, r4, LSR #16
        SUB r5, r5, r6, ASR #16 @ r5 = icur[0] - ilast[0]
        MLA r6, r4, r5, r6 @ r6 = (icur[0]-ilast[0])*opos_frac+ilast[0]

        LDR r7, [r2,#24] @ r7 = ilast[1]<<16 + 32768
        LDRSH r5, [r2,#18] @ r5 = icur[1]
        LDRSH r10,[r3] @ r10= obuf[0]
        MOV r6, r6, ASR #16 @ r6 = tmp1 >>= 16
        SUB r5, r5, r7, ASR #16 @ r5 = icur[1] - ilast[1]
        MLA r7, r4, r5, r7 @ r7 = (icur[1]-ilast[1])*opos_frac+ilast[1]

        LDRSH r5, [r3,#2] @ r5 = obuf[1]
        MOV r7, r7, ASR #16 @ r7 = tmp0 >>= 16
        MUL r7, r12,r7 @ r7 = tmp0*vol_l
        MUL r6, r14,r6 @ r6 = tmp1*vol_r

        ADDS r7, r7, r10, LSL #16 @ r7 = obuf[0]<<16 + tmp0*vol_l
        MOV r4, #0
        RSCVS r7, r4, #0x80000000 @ Clamp r7
        ADDS r6, r6, r5, LSL #16 @ r6 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r6, r4, #0x80000000 @ Clamp r6

        MOV r7, r7, LSR #16 @ Shift back to halfword
        MOV r6, r6, LSR #16 @ Shift back to halfword

        LDR r5, [r2,#12] @ r5 = opos_inc
        STRH r7, [r3],#2 @ Store output value
        STRH r6, [r3],#2 @ Store output value
        SUBS r11, r11,#1 @ osamp--
        BLE LinearRate_S_end @ and loop

        ADDS r8, r8, r5 @ r8 = opos += opos_inc
        BLT LinearRate_S_part2
        B LinearRate_S_loop
LinearRate_S_end:
        ADD r13,r13,#8
        STMIA r2,{r0,r1,r8}
MOV r0, r3 @ return obuf
        LDMFD r13!,{r4-r11,PC}
LinearRate_S_read:
        ADD r0, r2, #28 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}

        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 2+9+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #2 @ r1 = inLen-2
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT LinearRate_S_end
        B LinearRate_S_read_return

_ARM_LinearRate_R:
        @ r0 = AudioStream &input
        @ r1 = input.readBuffer
        @ r2 = input->sr
        @ r3 = obuf
        @ <> = osamp
        @ <> = vol_l
        @ <> = vol_r
        MOV r12,r13
        STMFD r13!,{r0-r1,r4-r11,r14}
        LDMFD r12,{r11,r12,r14} @ r11= osamp
                                        @ r12= vol_l
                                        @ r14= vol_r
        LDMIA r2,{r0,r1,r8} @ r0 = inPtr
                                        @ r1 = inLen
                                        @ r8 = opos
        CMP r11,#0 @ if (osamp <= 0)
        BLE LinearRate_R_end @ bale
        ORR r12,r12,r12,LSL #8 @ r12= vol_l as 16 bits
        ORR r14,r14,r14,LSL #8 @ r14= vol_r as 16 bits
        CMP r1,#0
        BGT LinearRate_R_part2

        @ part1 - read input samples
LinearRate_R_loop:
        SUBS r1, r1, #2 @ r1 = inLen -= 2
        BLT LinearRate_R_read
LinearRate_R_read_return:
        LDR r10,[r2, #16] @ r10= icur[0,1]
        LDRSH r5, [r0],#2 @ r5 = tmp0 = *inPtr++
        LDRSH r6, [r0],#2 @ r5 = tmp1 = *inPtr++
        SUBS r8, r8, #65536 @ r8 = opos--
        STRH r10,[r2,#22] @ ilast[0] = icur[0]
        MOV r10,r10,LSR #16
        STRH r10,[r2,#22] @ ilast[1] = icur[1]
        STRH r5, [r2,#16] @ icur[0] = tmp0
        STRH r6, [r2,#18] @ icur[1] = tmp1
        BGE LinearRate_R_loop

        @ part2 - form output samples
LinearRate_R_part2:
        @ We are guaranteed that opos < 0 here
        LDR r6, [r2,#20] @ r6 = ilast[0]
        LDRSH r5, [r2,#16] @ r5 = icur[0]
        MOV r4, r8, LSL #16
        MOV r4, r4, LSR #16
        SUB r5, r5, r6, ASR #16 @ r5 = icur[0] - ilast[0]
        MLA r6, r4, r5, r6 @ r6 = (icur[0]-ilast[0])*opos_frac+ilast[0]

        LDR r7, [r2,#24] @ r7 = ilast[1]
        LDRSH r5, [r2,#18] @ r5 = icur[1]
        LDR r10,[r3] @ r10= obuf[0]
        MOV r6, r6, ASR #16 @ r6 = tmp1 >>= 16
        SUB r5, r5, r7, ASR #16 @ r5 = icur[1] - ilast[1]
        MLA r7, r4, r5, r7 @ r7 = (icur[1]-ilast[1])*opos_frac+ilast[1]

        LDRSH r5, [r3,#2] @ r5 = obuf[1]
        MOV r7, r7, ASR #16 @ r7 = tmp0 >>= 16
        MUL r7, r12,r7 @ r7 = tmp0*vol_l
        MUL r6, r14,r6 @ r6 = tmp1*vol_r

        ADDS r7, r7, r10, LSL #16 @ r7 = obuf[0]<<16 + tmp0*vol_l
        MOV r4, #0
        RSCVS r7, r4, #0x80000000 @ Clamp r7
        ADDS r6, r6, r5, LSL #16 @ r6 = obuf[1]<<16 + tmp1*vol_r
        RSCVS r6, r4, #0x80000000 @ Clamp r6

        MOV r7, r7, LSR #16 @ Shift back to halfword
        MOV r6, r6, LSR #16 @ Shift back to halfword

        LDR r5, [r2,#12] @ r5 = opos_inc
        STRH r6, [r3],#2 @ Store output value
        STRH r7, [r3],#2 @ Store output value
        SUBS r11, r11,#1 @ osamp--
        BLE LinearRate_R_end @ and loop

        ADDS r8, r8, r5 @ r8 = opos += opos_inc
        BLT LinearRate_R_part2
        B LinearRate_R_loop
LinearRate_R_end:
        ADD r13,r13,#8
        STMIA r2,{r0,r1,r8}
MOV r0, r3 @ return obuf
        LDMFD r13!,{r4-r11,PC}
LinearRate_R_read:
        ADD r0, r2, #28 @ r0 = inPtr = inBuf
        STMFD r13!,{r0,r2-r3,r12,r14}

        MOV r1, r0 @ r1 = inBuf
        LDR r0, [r13,#20] @ r0 = AudioStream & input (20 = 4*5)
        MOV r2, #512 @ r2 = ARRAYSIZE(inBuf)

        @ Calling back into C++ here. WinCE is fairly easy about such things
        @ but other OS are more awkward. r9 is preserved for Symbian, and
        @ we have 2+9+5 = 16 things on the stack (an even number).
        MOV r14,PC
        LDR PC,[r13,#24] @ inLen = input.readBuffer(inBuf,512) (24 = 4*6)
        SUBS r1, r0, #2 @ r1 = inLen-2
        LDMFD r13!,{r0,r2-r3,r12,r14}
        BLT LinearRate_R_end
        B LinearRate_R_read_return
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