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author | Robin Watts <robin@xiph.org> | 2010-05-15 20:40:20 +0000 |
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committer | Robin Watts <robin@xiph.org> | 2010-05-15 20:40:20 +0000 |
commit | c650be1bdd4d3a2746b4631953c0e887aef9cd2d (patch) | |
tree | 7f75a54a36fa089739121bdc94dc8d7fa8e627ff /mdctLARM.s | |
parent | 7726777045d50734e851570b448294226ec0580d (diff) | |
download | tremor-c650be1bdd4d3a2746b4631953c0e887aef9cd2d.tar.gz |
ARM mdct implementations, and changes to the C code to call them.
Also changes in the configure.ac file to correctly include the assembly
files on ARM targets.
This is 'my first autoconf' stuff, so any hints/pointers on how to do it
better gratefully accepted.
git-svn-id: https://svn.xiph.org/branches/lowmem-branch/Tremolo@17218 0101bb08-14d6-0310-b084-bc0e0c8e3800
Diffstat (limited to 'mdctLARM.s')
-rw-r--r-- | mdctLARM.s | 1175 |
1 files changed, 1175 insertions, 0 deletions
diff --git a/mdctLARM.s b/mdctLARM.s new file mode 100644 index 0000000..9fb397e --- /dev/null +++ b/mdctLARM.s @@ -0,0 +1,1175 @@ +; Tremolo library +; Copyright (C) 2009 Robin Watts for Pinknoise Productions Ltd + + AREA |.text|, CODE, READONLY + + ; low accuracy version + + EXPORT mdct_backward_arm_low + EXPORT mdct_shift_right_arm_low + EXPORT mdct_unroll_prelap_arm_low + EXPORT mdct_unroll_part2_arm_low + EXPORT mdct_unroll_part3_arm_low + EXPORT mdct_unroll_postlap_arm_low + + IMPORT sincos_lookup0 + IMPORT sincos_lookup1 + +mdct_unroll_prelap_arm_low + ; r0 = out + ; r1 = post + ; r2 = r + ; r3 = step + STMFD r13!,{r4-r7,r14} + MVN r4, #0x8000 + MOV r3, r3, LSL #1 + SUB r1, r2, r1 ; r1 = r - post + SUBS r1, r1, #16 ; r1 = r - post - 16 + BLT unroll_over +unroll_loop + LDMDB r2!,{r5,r6,r7,r12} + + MOV r5, r5, ASR #9 ; r5 = (*--r)>>9 + MOV r6, r6, ASR #9 ; r6 = (*--r)>>9 + MOV r7, r7, ASR #9 ; r7 = (*--r)>>9 + MOV r12,r12,ASR #9 ; r12= (*--r)>>9 + + MOV r14,r12,ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r12,r4, r14,ASR #31 + STRH r12,[r0], r3 + + MOV r14,r7, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r7, r4, r14,ASR #31 + STRH r7, [r0], r3 + + MOV r14,r6, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r6, r4, r14,ASR #31 + STRH r6, [r0], r3 + + MOV r14,r5, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r5, r4, r14,ASR #31 + STRH r5, [r0], r3 + + SUBS r1, r1, #16 + BGE unroll_loop + +unroll_over + ADDS r1, r1, #16 + BLE unroll_end +unroll_loop2 + LDR r5,[r2,#-4]! + ; stall + ; stall (Xscale) + MOV r5, r5, ASR #9 ; r5 = (*--r)>>9 + MOV r14,r5, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r5, r4, r14,ASR #31 + STRH r5, [r0], r3 + SUBS r1, r1, #4 + BGT unroll_loop2 +unroll_end + LDMFD r13!,{r4-r7,PC} + +mdct_unroll_postlap_arm_low + ; r0 = out + ; r1 = post + ; r2 = l + ; r3 = step + STMFD r13!,{r4-r7,r14} + MVN r4, #0x8000 + MOV r3, r3, LSL #1 + SUB r1, r1, r2 ; r1 = post - l + MOV r1, r1, ASR #1 ; r1 = (post - l)>>1 + SUBS r1, r1, #16 ; r1 = ((post - l)>>1) - 4 + BLT unroll_over3 +unroll_loop3 + LDR r12,[r2],#8 + LDR r7, [r2],#8 + LDR r6, [r2],#8 + LDR r5, [r2],#8 + + RSB r12,r12,#0 + RSB r5, r5, #0 + RSB r6, r6, #0 + RSB r7, r7, #0 + + MOV r12, r12,ASR #9 ; r12= (-*l)>>9 + MOV r5, r5, ASR #9 ; r5 = (-*l)>>9 + MOV r6, r6, ASR #9 ; r6 = (-*l)>>9 + MOV r7, r7, ASR #9 ; r7 = (-*l)>>9 + + MOV r14,r12,ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r12,r4, r14,ASR #31 + STRH r12,[r0], r3 + + MOV r14,r7, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r7, r4, r14,ASR #31 + STRH r7, [r0], r3 + + MOV r14,r6, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r6, r4, r14,ASR #31 + STRH r6, [r0], r3 + + MOV r14,r5, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r5, r4, r14,ASR #31 + STRH r5, [r0], r3 + + SUBS r1, r1, #16 + BGE unroll_loop3 + +unroll_over3 + ADDS r1, r1, #16 + BLE unroll_over4 +unroll_loop4 + LDR r5,[r2], #8 + ; stall + ; stall (Xscale) + RSB r5, r5, #0 + MOV r5, r5, ASR #9 ; r5 = (-*l)>>9 + MOV r14,r5, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r5, r4, r14,ASR #31 + STRH r5, [r0], r3 + SUBS r1, r1, #4 + BGT unroll_loop4 +unroll_over4 + LDMFD r13!,{r4-r7,PC} + +mdct_unroll_part2_arm_low + ; r0 = out + ; r1 = post + ; r2 = l + ; r3 = r + ; <> = step + ; <> = wL + ; <> = wR + MOV r12,r13 + STMFD r13!,{r4,r6-r11,r14} + LDMFD r12,{r8,r9,r10} ; r8 = step + ; r9 = wL + ; r10= wR + MVN r4, #0x8000 + MOV r8, r8, LSL #1 + SUBS r1, r3, r1 ; r1 = (r - post) + BLE unroll_over5 +unroll_loop5 + LDR r12,[r2, #-8]! ; r12= *l (but l -= 2 first) + LDR r7, [r3, #-4]! ; r7 = *--r + LDRB r6, [r10,#-1]! ; r6 = *--wR + LDRB r11,[r9],#1 ; r11= *wL++ + + MOV r12, r12, ASR #8 + ; Can save a cycle here, at the cost of 1bit errors in rounding + MUL r11,r12,r11 ; r11 = *l * *wL++ + MOV r7, r7, ASR #8 + MLA r6, r7, r6, r11 ; r6 = *--r * *--wR + MOV r6, r6, ASR #9 + MOV r14,r6, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r6, r4, r14,ASR #31 + STRH r6, [r0], r8 + + SUBS r1, r1, #4 + BGT unroll_loop5 + +unroll_over5 + LDMFD r13!,{r4,r6-r11,PC} + +mdct_unroll_part3_arm_low + ; r0 = out + ; r1 = post + ; r2 = l + ; r3 = r + ; <> = step + ; <> = wL + ; <> = wR + MOV r12,r13 + STMFD r13!,{r4,r6-r11,r14} + LDMFD r12,{r8,r9,r10} ; r8 = step + ; r9 = wL + ; r10= wR + MVN r4, #0x8000 + MOV r8, r8, LSL #1 + SUBS r1, r1, r3 ; r1 = (post - r) + BLE unroll_over6 +unroll_loop6 + LDR r12,[r2],#8 ; r12= *l (but l += 2 first) + LDR r7, [r3],#4 ; r7 = *r++ + LDRB r11,[r9],#1 ; r11= *wL++ + LDRB r6, [r10,#-1]! ; r6 = *--wR + + ; Can save a cycle here, at the cost of 1bit errors in rounding + MOV r12,r12,ASR #8 + MUL r11,r12,r11 ; (r14,r11) = *l * *wL++ + MOV r7, r7, ASR #8 + MUL r6, r7, r6 ; (r14,r6) = *--r * *--wR + SUB r6, r6, r11 + MOV r6, r6, ASR #9 + MOV r14,r6, ASR #15 + TEQ r14,r14,ASR #31 ; if r14==0 || r14==-1 then in range + EORNE r6, r4, r14,ASR #31 + STRH r6, [r0], r8 + + SUBS r1, r1, #4 + BGT unroll_loop6 + +unroll_over6 + LDMFD r13!,{r4,r6-r11,PC} + +mdct_shift_right_arm_low + ; r0 = n + ; r1 = in + ; r2 = right + STMFD r13!,{r4-r11,r14} + + MOV r0, r0, LSR #2 ; n >>= 2 + ADD r1, r1, #4 + + SUBS r0, r0, #8 + BLT sr_less_than_8 +sr_loop + LDR r3, [r1], #8 + LDR r4, [r1], #8 + LDR r5, [r1], #8 + LDR r6, [r1], #8 + LDR r7, [r1], #8 + LDR r8, [r1], #8 + LDR r12,[r1], #8 + LDR r14,[r1], #8 + SUBS r0, r0, #8 + STMIA r2!,{r3,r4,r5,r6,r7,r8,r12,r14} + BGE sr_loop +sr_less_than_8 + ADDS r0, r0, #8 + BEQ sr_end +sr_loop2 + LDR r3, [r1], #8 + SUBS r0, r0, #1 + STR r3, [r2], #4 + BGT sr_loop2 +sr_end + LDMFD r13!,{r4-r11,PC} + +mdct_backward_arm_low + ; r0 = n + ; r1 = in + STMFD r13!,{r4-r11,r14} + + MOV r2, #1<<4 ; r2 = 1<<shift + MOV r3, #13-4 ; r3 = 13-shift +find_shift_loop + TST r0, r2 ; if (n & (1<<shift)) == 0 + MOV r2, r2, LSL #1 + SUBEQ r3, r3, #1 ; shift-- + BEQ find_shift_loop + MOV r2, #2 + MOV r2, r2, LSL r3 ; r2 = step = 2<<shift + + ; presymmetry + ; r0 = n (a multiple of 4) + ; r1 = in + ; r2 = step + ; r3 = shift + + ADD r4, r1, r0, LSL #1 ; r4 = aX = in+(n>>1) + ADD r14,r1, r0 ; r14= in+(n>>2) + SUB r4, r4, #3*4 ; r4 = aX = in+n2-3 + LDR r5, =sincos_lookup0 ; r5 = T=sincos_lookup0 + +presymmetry_loop1 + LDR r7, [r4,#8] ; r6 = s2 = aX[2] + LDRB r11,[r5,#1] ; r11= T[1] + LDR r6, [r4],#-16 ; r6 = s0 = aX[0] + LDRB r10,[r5],r2 ; r10= T[0] T += step + MOV r6, r6, ASR #8 + MOV r7, r7, ASR #8 + + ; XPROD31(s0, s2, T[0], T[1], &aX[0], &ax[2]) + MUL r9, r6, r10 ; r9 = s0*T[0] + RSB r6, r6, #0 + MLA r9, r7, r11,r9 ; r9 += s2*T[1] + CMP r4, r14 + MUL r12,r7, r10 ; r12 = s2*T[0] + STR r9, [r4,#16] ; aX[0] = r9 + MLA r12,r6, r11,r12 ; r12 -= s0*T[1] + STR r12,[r4,#8+16] ; aX[2] = r12 + + BGE presymmetry_loop1 ; while (aX >= in+n4) + +presymmetry_loop2 + LDR r6, [r4],#-16 ; r6 = s0 = aX[0] + LDRB r10,[r5,#1] ; r10= T[1] + LDR r7, [r4,#16+8] ; r6 = s2 = aX[2] + LDRB r11,[r5],-r2 ; r11= T[0] T -= step + MOV r6, r6, ASR #8 + MOV r7, r7, ASR #8 + + ; XPROD31(s0, s2, T[1], T[0], &aX[0], &ax[2]) + MUL r9, r6, r10 ; r9 = s0*T[1] + RSB r6, r6, #0 + MLA r9, r7, r11,r9 ; r9 += s2*T[0] + CMP r4, r1 + MUL r12,r7, r10 ; r12 = s2*T[1] + STR r9, [r4,#16] ; aX[0] = r9 + MLA r12,r6, r11,r12 ; r12 -= s0*T[0] + STR r12,[r4,#8+16] ; aX[2] = r12 + + BGE presymmetry_loop2 ; while (aX >= in) + + ; r0 = n + ; r1 = in + ; r2 = step + ; r3 = shift + STMFD r13!,{r3} + LDR r5, =sincos_lookup0 ; r5 = T=sincos_lookup0 + ADD r4, r1, r0, LSL #1 ; r4 = aX = in+(n>>1) + SUB r4, r4, #4*4 ; r4 = aX = in+(n>>1)-4 + LDRB r11,[r5,#1] ; r11= T[1] + LDRB r10,[r5],r2 ; r10= T[0] T += step +presymmetry_loop3 + LDR r8, [r1],#16 ; r8 = ro0 = bX[0] + LDR r9, [r1,#8-16] ; r9 = ro2 = bX[2] + LDR r6, [r4],#-16 ; r6 = ri0 = aX[0] + LDR r7, [r4,#8+16] ; r7 = ri2 = aX[2] + MOV r8, r8, ASR #8 + MOV r9, r9, ASR #8 + MOV r6, r6, ASR #8 + + ; XNPROD31( ro2, ro0, T[1], T[0], &aX[0], &aX[2] ) + ; aX[0] = (ro2*T[1] - ro0*T[0])>>31 aX[2] = (ro0*T[1] + ro2*T[0])>>31 + MUL r12,r8, r11 ; r12 = ro0*T[1] + MOV r7, r7, ASR #8 + MLA r12,r9, r10,r12 ; r12 += ro2*T[0] + RSB r8, r8, #0 ; r8 = -ro0 + MUL r3, r9, r11 ; r3 = ro2*T[1] + LDRB r11,[r5,#1] ; r11= T[1] + MLA r3, r8, r10,r3 ; r3 -= ro0*T[0] + LDRB r10,[r5],r2 ; r10= T[0] T += step + STR r12,[r4,#16+8] + STR r3, [r4,#16] + + ; XNPROD31( ri2, ri0, T[0], T[1], &bX[0], &bX[2] ) + ; bX[0] = (ri2*T[0] - ri0*T[1])>>31 bX[2] = (ri0*T[0] + ri2*T[1])>>31 + MUL r12,r6, r10 ; r12 = ri0*T[0] + RSB r6, r6, #0 ; r6 = -ri0 + MLA r12,r7, r11,r12 ; r12 += ri2*T[1] + CMP r4, r1 + MUL r3, r7, r10 ; r3 = ri2*T[0] + STR r12,[r1,#8-16] + MLA r3, r6, r11,r3 ; r3 -= ri0*T[1] + STR r3, [r1,#-16] + + BGE presymmetry_loop3 + + SUB r1,r1,r0 ; r1 = in -= n>>2 (i.e. restore in) + + LDR r3,[r13] + STR r2,[r13,#-4]! + + ; mdct_butterflies + ; r0 = n = (points * 2) + ; r1 = in = x + ; r2 = i + ; r3 = shift + STMFD r13!,{r0-r1} + RSBS r4,r3,#6 ; r4 = stages = 7-shift then --stages + LDR r5,=sincos_lookup0 + BLE no_generics + MOV r14,#4 ; r14= 4 (i=0) + MOV r6, r14,LSL r3 ; r6 = (4<<i)<<shift +mdct_butterflies_loop1 + MOV r0, r0, LSR #1 ; r0 = points>>i = POINTS + MOV r2, r14,LSR #2 ; r2 = (1<<i)-j (j=0) + STMFD r13!,{r4,r14} +mdct_butterflies_loop2 + + ; mdct_butterfly_generic(x+POINTS*j, POINTS, 4<<(i+shift)) + ; mdct_butterfly_generic(r1, r0, r6) + ; r0 = points + ; r1 = x + ; preserve r2 (external loop counter) + ; preserve r3 + ; preserve r4 (external loop counter) + ; r5 = T = sincos_lookup0 + ; r6 = step + ; preserve r14 + + STR r2,[r13,#-4]! ; stack r2 + ADD r1,r1,r0,LSL #1 ; r1 = x2+4 = x + (POINTS>>1) + ADD r7,r1,r0,LSL #1 ; r7 = x1+4 = x + POINTS + ADD r12,r5,#1024 ; r12= sincos_lookup0+1024 + +mdct_bufferfly_generic_loop1 + LDMDB r7!,{r2,r3,r8,r11} ; r2 = x1[0] + ; r3 = x1[1] + ; r8 = x1[2] + ; r11= x1[3] x1 -= 4 + LDMDB r1!,{r4,r9,r10,r14} ; r4 = x2[0] + ; r9 = x2[1] + ; r10= x2[2] + ; r14= x2[3] x2 -= 4 + + SUB r2, r2, r3 ; r2 = s0 = x1[0] - x1[1] + ADD r3, r2, r3, LSL #1 ; r3 = x1[0] + x1[1] (-> x1[0]) + SUB r11,r11,r8 ; r11= s1 = x1[3] - x1[2] + ADD r8, r11,r8, LSL #1 ; r8 = x1[3] + x1[2] (-> x1[2]) + SUB r9, r9, r4 ; r9 = s2 = x2[1] - x2[0] + ADD r4, r9, r4, LSL #1 ; r4 = x2[1] + x2[0] (-> x1[1]) + SUB r14,r14,r10 ; r14= s3 = x2[3] - x2[2] + ADD r10,r14,r10,LSL #1 ; r10= x2[3] + x2[2] (-> x1[3]) + STMIA r7,{r3,r4,r8,r10} + + ; r0 = points + ; r1 = x2 + ; r2 = s0 + ; r3 free + ; r4 free + ; r5 = T + ; r6 = step + ; r7 = x1 + ; r8 free + ; r9 = s2 + ; r10 free + ; r11= s1 + ; r12= limit + ; r14= s3 + + LDRB r8, [r5,#1] ; r8 = T[1] + LDRB r10,[r5],r6 ; r10= T[0] T += step + MOV r2, r2, ASR #8 + MOV r11,r11,ASR #8 + MOV r9, r9, ASR #8 + MOV r14,r14,ASR #8 + + ; XPROD31(s1, s0, T[0], T[1], &x2[0], &x2[2]) + ; x2[0] = (s1*T[0] + s0*T[1])>>31 x2[2] = (s0*T[0] - s1*T[1])>>31 + ; stall Xscale + MUL r3, r2, r8 ; r3 = s0*T[1] + MLA r3, r11,r10,r3 ; r3 += s1*T[0] + RSB r11,r11,#0 + MUL r4, r8, r11 ; r4 = -s1*T[1] + MLA r4, r2, r10,r4 ; r4 += s0*T[0] = Value for x2[2] + MOV r2, r3 ; r2 = r3 = Value for x2[0] + + ; XPROD31(s2, s3, T[0], T[1], &x2[1], &x2[3]) + ; x2[1] = (s2*T[0] + s3*T[1])>>31 x2[3] = (s3*T[0] - s2*T[1])>>31 + MUL r3, r9, r10 ; r3 = s2*T[0] + MLA r3, r14,r8, r3 ; r3 += s3*T[1] = Value for x2[1] + RSB r9, r9, #0 + MUL r11,r14,r10 ; r11 = s3*T[0] + MLA r11,r9, r8, r11 ; r11 -= s2*T[1] = Value for x2[3] + CMP r5, r12 + + STMIA r1,{r2,r3,r4,r11} + + BLT mdct_bufferfly_generic_loop1 + + SUB r12,r12,#1024 +mdct_bufferfly_generic_loop2 + LDMDB r7!,{r2,r3,r9,r10} ; r2 = x1[0] + ; r3 = x1[1] + ; r9 = x1[2] + ; r10= x1[3] x1 -= 4 + LDMDB r1!,{r4,r8,r11,r14} ; r4 = x2[0] + ; r8 = x2[1] + ; r11= x2[2] + ; r14= x2[3] x2 -= 4 + + SUB r2, r2, r3 ; r2 = s0 = x1[0] - x1[1] + ADD r3, r2, r3, LSL #1 ; r3 = x1[0] + x1[1] (-> x1[0]) + SUB r9, r9,r10 ; r9 = s1 = x1[2] - x1[3] + ADD r10,r9,r10, LSL #1 ; r10= x1[2] + x1[3] (-> x1[2]) + SUB r4, r4, r8 ; r4 = s2 = x2[0] - x2[1] + ADD r8, r4, r8, LSL #1 ; r8 = x2[0] + x2[1] (-> x1[1]) + SUB r14,r14,r11 ; r14= s3 = x2[3] - x2[2] + ADD r11,r14,r11,LSL #1 ; r11= x2[3] + x2[2] (-> x1[3]) + STMIA r7,{r3,r8,r10,r11} + + ; r0 = points + ; r1 = x2 + ; r2 = s0 + ; r3 free + ; r4 = s2 + ; r5 = T + ; r6 = step + ; r7 = x1 + ; r8 free + ; r9 = s1 + ; r10 free + ; r11 free + ; r12= limit + ; r14= s3 + + LDRB r8, [r5,#1] ; r8 = T[1] + LDRB r10,[r5],-r6 ; r10= T[0] T -= step + MOV r2, r2, ASR #8 + MOV r9, r9, ASR #8 + MOV r4, r4, ASR #8 + MOV r14,r14,ASR #8 + + ; XNPROD31(s0, s1, T[0], T[1], &x2[0], &x2[2]) + ; x2[0] = (s0*T[0] - s1*T[1])>>31 x2[2] = (s1*T[0] + s0*T[1])>>31 + ; stall Xscale + MUL r11,r2, r8 ; r11 = s0*T[1] + MLA r11,r9, r10,r11 ; r11 += s1*T[0] + RSB r9, r9, #0 + MUL r2, r10,r2 ; r2 = s0*T[0] + MLA r2, r9, r8, r2 ; r2 += -s1*T[1] = Value for x2[0] + MOV r9, r11 ; r9 = r11 = Value for x2[2] + + ; XNPROD31(s3, s2, T[0], T[1], &x2[1], &x2[3]) + ; x2[1] = (s3*T[0] - s2*T[1])>>31 x2[3] = (s2*T[0] + s3*T[1])>>31 + MUL r11,r4, r10 ; r11 = s2*T[0] + MLA r11,r14,r8, r11 ; r11 += s3*T[1] = Value for x2[3] + RSB r4, r4, #0 + MUL r3, r14,r10 ; r3 = s3*T[0] + MLA r3, r4, r8, r3 ; r3 -= s2*T[1] = Value for x2[1] + CMP r5, r12 + + STMIA r1,{r2,r3,r9,r11} + + BGT mdct_bufferfly_generic_loop2 + + LDR r2,[r13],#4 ; unstack r2 + ADD r1, r1, r0, LSL #2 ; r1 = x+POINTS*j + ; stall Xscale + SUBS r2, r2, #1 ; r2-- (j++) + BGT mdct_butterflies_loop2 + + LDMFD r13!,{r4,r14} + + LDR r1,[r13,#4] + + SUBS r4, r4, #1 ; stages-- + MOV r14,r14,LSL #1 ; r14= 4<<i (i++) + MOV r6, r6, LSL #1 ; r6 = step <<= 1 (i++) + BGE mdct_butterflies_loop1 + LDMFD r13,{r0-r1} + +no_generics + ; mdct_butterflies part2 (loop around mdct_bufferfly_32) + ; r0 = points + ; r1 = in + ; r2 = step + ; r3 = shift + +mdct_bufferflies_loop3 + ; mdct_bufferfly_32 + + ; block1 + ADD r4, r1, #16*4 ; r4 = &in[16] + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[16] + ; r6 = x[17] + ; r9 = x[18] + ; r10= x[19] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[0] + ; r8 = x[1] + ; r11= x[2] + ; r12= x[3] + SUB r5, r5, r6 ; r5 = s0 = x[16] - x[17] + ADD r6, r5, r6, LSL #1 ; r6 = x[16] + x[17] -> x[16] + SUB r9, r9, r10 ; r9 = s1 = x[18] - x[19] + ADD r10,r9, r10,LSL #1 ; r10= x[18] + x[19] -> x[18] + SUB r8, r8, r7 ; r8 = s2 = x[ 1] - x[ 0] + ADD r7, r8, r7, LSL #1 ; r7 = x[ 1] + x[ 0] -> x[17] + SUB r12,r12,r11 ; r12= s3 = x[ 3] - x[ 2] + ADD r11,r12,r11, LSL #1 ; r11= x[ 3] + x[ 2] -> x[19] + STMIA r4!,{r6,r7,r10,r11} + + MOV r6,#0xed ; r6 =cPI1_8 + MOV r7,#0x62 ; r7 =cPI3_8 + + MOV r5, r5, ASR #8 + MOV r9, r9, ASR #8 + MOV r8, r8, ASR #8 + MOV r12,r12,ASR #8 + + ; XNPROD31( s0, s1, cPI3_8, cPI1_8, &x[ 0], &x[ 2] ) + ; x[0] = s0*cPI3_8 - s1*cPI1_8 x[2] = s1*cPI3_8 + s0*cPI1_8 + ; stall Xscale + MUL r11,r5, r6 ; r11 = s0*cPI1_8 + MLA r11,r9, r7, r11 ; r11 += s1*cPI3_8 + RSB r9, r9, #0 + MUL r5, r7, r5 ; r5 = s0*cPI3_8 + MLA r5, r9, r6, r5 ; r5 -= s1*cPI1_8 + + ; XPROD31 ( s2, s3, cPI1_8, cPI3_8, &x[ 1], &x[ 3] ) + ; x[1] = s2*cPI1_8 + s3*cPI3_8 x[3] = s3*cPI1_8 - s2*cPI3_8 + MUL r9, r8, r6 ; r9 = s2*cPI1_8 + MLA r9, r12,r7, r9 ; r9 += s3*cPI3_8 + RSB r8,r8,#0 + MUL r12,r6, r12 ; r12 = s3*cPI1_8 + MLA r12,r8, r7, r12 ; r12 -= s2*cPI3_8 + STMIA r1!,{r5,r9,r11,r12} + + ; block2 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[20] + ; r6 = x[21] + ; r9 = x[22] + ; r10= x[23] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[4] + ; r8 = x[5] + ; r11= x[6] + ; r12= x[7] + SUB r5, r5, r6 ; r5 = s0 = x[20] - x[21] + ADD r6, r5, r6, LSL #1 ; r6 = x[20] + x[21] -> x[20] + SUB r9, r9, r10 ; r9 = s1 = x[22] - x[23] + ADD r10,r9, r10,LSL #1 ; r10= x[22] + x[23] -> x[22] + SUB r8, r8, r7 ; r8 = s2 = x[ 5] - x[ 4] + ADD r7, r8, r7, LSL #1 ; r7 = x[ 5] + x[ 4] -> x[21] + SUB r12,r12,r11 ; r12= s3 = x[ 7] - x[ 6] + ADD r11,r12,r11, LSL #1 ; r11= x[ 7] + x[ 6] -> x[23] + MOV r14,#0xb5 ; cPI2_8 + STMIA r4!,{r6,r7,r10,r11} + + SUB r5, r5, r9 ; r5 = s0 - s1 + ADD r9, r5, r9, LSL #1 ; r9 = s0 + s1 + MOV r5, r5, ASR #8 + MUL r5, r14,r5 ; r5 = (s0-s1)*cPI2_8 + SUB r12,r12,r8 ; r12= s3 - s2 + ADD r8, r12,r8, LSL #1 ; r8 = s3 + s2 + + MOV r8, r8, ASR #8 + MUL r8, r14,r8 ; r8 = (s3+s2)*cPI2_8 + MOV r9, r9, ASR #8 + MUL r9, r14,r9 ; r9 = (s0+s1)*cPI2_8 + MOV r12,r12,ASR #8 + MUL r12,r14,r12 ; r12 = (s3-s2)*cPI2_8 + STMIA r1!,{r5,r8,r9,r12} + + ; block3 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[24] + ; r6 = x[25] + ; r9 = x[25] + ; r10= x[26] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[8] + ; r8 = x[9] + ; r11= x[10] + ; r12= x[11] + SUB r5, r5, r6 ; r5 = s0 = x[24] - x[25] + ADD r6, r5, r6, LSL #1 ; r6 = x[24] + x[25] -> x[25] + SUB r9, r9, r10 ; r9 = s1 = x[26] - x[27] + ADD r10,r9, r10,LSL #1 ; r10= x[26] + x[27] -> x[26] + SUB r8, r8, r7 ; r8 = s2 = x[ 9] - x[ 8] + ADD r7, r8, r7, LSL #1 ; r7 = x[ 9] + x[ 8] -> x[25] + SUB r12,r12,r11 ; r12= s3 = x[11] - x[10] + ADD r11,r12,r11, LSL #1 ; r11= x[11] + x[10] -> x[27] + STMIA r4!,{r6,r7,r10,r11} + + MOV r6,#0x62 ; r6 = cPI3_8 + MOV r7,#0xED ; r7 = cPI1_8 + + ; XNPROD31( s0, s1, cPI1_8, cPI3_8, &x[ 8], &x[10] ) + ; x[8] = s0*cPI1_8 - s1*cPI3_8 x[10] = s1*cPI1_8 + s0*cPI3_8 + ; stall Xscale + MOV r5, r5, ASR #8 + MUL r11,r5, r6 ; r11 = s0*cPI3_8 + MOV r9, r9, ASR #8 + MLA r11,r9, r7, r11 ; r11 += s1*cPI1_8 + RSB r9, r9, #0 + MUL r5, r7, r5 ; r5 = s0*cPI1_8 + MLA r5, r9, r6, r5 ; r5 -= s1*cPI3_8 + + ; XPROD31 ( s2, s3, cPI3_8, cPI1_8, &x[ 9], &x[11] ) + ; x[9] = s2*cPI3_8 + s3*cPI1_8 x[11] = s3*cPI3_8 - s2*cPI1_8 + MOV r8, r8, ASR #8 + MUL r9, r8, r6 ; r9 = s2*cPI3_8 + MOV r12,r12,ASR #8 + MLA r9, r12,r7, r9 ; r9 += s3*cPI1_8 + RSB r8,r8,#0 + MUL r12,r6, r12 ; r12 = s3*cPI3_8 + MLA r12,r8, r7, r12 ; r12 -= s2*cPI1_8 + STMIA r1!,{r5,r9,r11,r12} + + ; block4 + LDMIA r4,{r5,r6,r10,r11} ; r5 = x[28] + ; r6 = x[29] + ; r10= x[30] + ; r11= x[31] + LDMIA r1,{r8,r9,r12,r14} ; r8 = x[12] + ; r9 = x[13] + ; r12= x[14] + ; r14= x[15] + SUB r5, r5, r6 ; r5 = s0 = x[28] - x[29] + ADD r6, r5, r6, LSL #1 ; r6 = x[28] + x[29] -> x[28] + SUB r7, r14,r12 ; r7 = s3 = x[15] - x[14] + ADD r12,r7, r12, LSL #1 ; r12= x[15] + x[14] -> x[31] + SUB r10,r10,r11 ; r10= s1 = x[30] - x[31] + ADD r11,r10,r11,LSL #1 ; r11= x[30] + x[31] -> x[30] + SUB r14, r8, r9 ; r14= s2 = x[12] - x[13] + ADD r9, r14, r9, LSL #1 ; r9 = x[12] + x[13] -> x[29] + STMIA r4!,{r6,r9,r11,r12} + STMIA r1!,{r5,r7,r10,r14} + + ; mdct_butterfly16 (1st version) + ; block 1 + SUB r1,r1,#16*4 + ADD r4,r1,#8*4 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[ 8] + ; r6 = x[ 9] + ; r9 = x[10] + ; r10= x[11] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[0] + ; r8 = x[1] + ; r11= x[2] + ; r12= x[3] + SUB r5, r5, r6 ; r5 = s0 = x[ 8] - x[ 9] + ADD r6, r5, r6, LSL #1 ; r6 = x[ 8] + x[ 9] -> x[ 8] + SUB r9, r9, r10 ; r9 = s1 = x[10] - x[11] + ADD r10,r9, r10,LSL #1 ; r10= x[10] + x[11] -> x[10] + SUB r8, r8, r7 ; r8 = s2 = x[ 1] - x[ 0] + ADD r7, r8, r7, LSL #1 ; r7 = x[ 1] + x[ 0] -> x[ 9] + SUB r12,r12,r11 ; r12= s3 = x[ 3] - x[ 2] + ADD r11,r12,r11, LSL #1 ; r11= x[ 3] + x[ 2] -> x[11] + MOV r14,#0xB5 ; r14= cPI2_8 + STMIA r4!,{r6,r7,r10,r11} + + SUB r5, r5, r9 ; r5 = s0 - s1 + ADD r9, r5, r9, LSL #1 ; r9 = s0 + s1 + MOV r5, r5, ASR #8 + MUL r5, r14,r5 ; r5 = (s0-s1)*cPI2_8 + SUB r12,r12,r8 ; r12= s3 - s2 + ADD r8, r12,r8, LSL #1 ; r8 = s3 + s2 + + MOV r8, r8, ASR #8 + MUL r8, r14,r8 ; r8 = (s3+s2)*cPI2_8 + MOV r9, r9, ASR #8 + MUL r9, r14,r9 ; r9 = (s0+s1)*cPI2_8 + MOV r12,r12,ASR #8 + MUL r12,r14,r12 ; r12 = (s3-s2)*cPI2_8 + STMIA r1!,{r5,r8,r9,r12} + + ; block2 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[12] + ; r6 = x[13] + ; r9 = x[14] + ; r10= x[15] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[ 4] + ; r8 = x[ 5] + ; r11= x[ 6] + ; r12= x[ 7] + SUB r14,r7, r8 ; r14= s0 = x[ 4] - x[ 5] + ADD r8, r14,r8, LSL #1 ; r8 = x[ 4] + x[ 5] -> x[13] + SUB r7, r12,r11 ; r7 = s1 = x[ 7] - x[ 6] + ADD r11,r7, r11, LSL #1 ; r11= x[ 7] + x[ 6] -> x[15] + SUB r5, r5, r6 ; r5 = s2 = x[12] - x[13] + ADD r6, r5, r6, LSL #1 ; r6 = x[12] + x[13] -> x[12] + SUB r12,r9, r10 ; r12= s3 = x[14] - x[15] + ADD r10,r12,r10,LSL #1 ; r10= x[14] + x[15] -> x[14] + STMIA r4!,{r6,r8,r10,r11} + STMIA r1!,{r5,r7,r12,r14} + + ; mdct_butterfly_8 + LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} + ; r6 = x[0] + ; r7 = x[1] + ; r8 = x[2] + ; r9 = x[3] + ; r10= x[4] + ; r11= x[5] + ; r12= x[6] + ; r14= x[7] + ADD r6, r6, r7 ; r6 = s0 = x[0] + x[1] + SUB r7, r6, r7, LSL #1 ; r7 = s1 = x[0] - x[1] + ADD r8, r8, r9 ; r8 = s2 = x[2] + x[3] + SUB r9, r8, r9, LSL #1 ; r9 = s3 = x[2] - x[3] + ADD r10,r10,r11 ; r10= s4 = x[4] + x[5] + SUB r11,r10,r11,LSL #1 ; r11= s5 = x[4] - x[5] + ADD r12,r12,r14 ; r12= s6 = x[6] + x[7] + SUB r14,r12,r14,LSL #1 ; r14= s7 = x[6] - x[7] + + ADD r2, r11,r9 ; r2 = x[0] = s5 + s3 + SUB r4, r2, r9, LSL #1 ; r4 = x[2] = s5 - s3 + SUB r3, r14,r7 ; r3 = x[1] = s7 - s1 + ADD r5, r3, r7, LSL #1 ; r5 = x[3] = s7 + s1 + SUB r10,r10,r6 ; r10= x[4] = s4 - s0 + SUB r11,r12,r8 ; r11= x[5] = s6 - s2 + ADD r12,r10,r6, LSL #1 ; r12= x[6] = s4 + s0 + ADD r14,r11,r8, LSL #1 ; r14= x[7] = s6 + s2 + STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} + + ; mdct_butterfly_8 + LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} + ; r6 = x[0] + ; r7 = x[1] + ; r8 = x[2] + ; r9 = x[3] + ; r10= x[4] + ; r11= x[5] + ; r12= x[6] + ; r14= x[7] + ADD r6, r6, r7 ; r6 = s0 = x[0] + x[1] + SUB r7, r6, r7, LSL #1 ; r7 = s1 = x[0] - x[1] + ADD r8, r8, r9 ; r8 = s2 = x[2] + x[3] + SUB r9, r8, r9, LSL #1 ; r9 = s3 = x[2] - x[3] + ADD r10,r10,r11 ; r10= s4 = x[4] + x[5] + SUB r11,r10,r11,LSL #1 ; r11= s5 = x[4] - x[5] + ADD r12,r12,r14 ; r12= s6 = x[6] + x[7] + SUB r14,r12,r14,LSL #1 ; r14= s7 = x[6] - x[7] + + ADD r2, r11,r9 ; r2 = x[0] = s5 + s3 + SUB r4, r2, r9, LSL #1 ; r4 = x[2] = s5 - s3 + SUB r3, r14,r7 ; r3 = x[1] = s7 - s1 + ADD r5, r3, r7, LSL #1 ; r5 = x[3] = s7 + s1 + SUB r10,r10,r6 ; r10= x[4] = s4 - s0 + SUB r11,r12,r8 ; r11= x[5] = s6 - s2 + ADD r12,r10,r6, LSL #1 ; r12= x[6] = s4 + s0 + ADD r14,r11,r8, LSL #1 ; r14= x[7] = s6 + s2 + STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} + + ; mdct_butterfly16 (2nd version) + ; block 1 + ADD r1,r1,#16*4-8*4 + ADD r4,r1,#8*4 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[ 8] + ; r6 = x[ 9] + ; r9 = x[10] + ; r10= x[11] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[0] + ; r8 = x[1] + ; r11= x[2] + ; r12= x[3] + SUB r5, r5, r6 ; r5 = s0 = x[ 8] - x[ 9] + ADD r6, r5, r6, LSL #1 ; r6 = x[ 8] + x[ 9] -> x[ 8] + SUB r9, r9, r10 ; r9 = s1 = x[10] - x[11] + ADD r10,r9, r10,LSL #1 ; r10= x[10] + x[11] -> x[10] + SUB r8, r8, r7 ; r8 = s2 = x[ 1] - x[ 0] + ADD r7, r8, r7, LSL #1 ; r7 = x[ 1] + x[ 0] -> x[ 9] + SUB r12,r12,r11 ; r12= s3 = x[ 3] - x[ 2] + ADD r11,r12,r11, LSL #1 ; r11= x[ 3] + x[ 2] -> x[11] + MOV r14,#0xb5 ; r14= cPI2_8 + STMIA r4!,{r6,r7,r10,r11} + + SUB r5, r5, r9 ; r5 = s0 - s1 + ADD r9, r5, r9, LSL #1 ; r9 = s0 + s1 + MOV r5, r5, ASR #8 + MUL r5, r14,r5 ; r5 = (s0-s1)*cPI2_8 + SUB r12,r12,r8 ; r12= s3 - s2 + ADD r8, r12,r8, LSL #1 ; r8 = s3 + s2 + + MOV r8, r8, ASR #8 + MUL r8, r14,r8 ; r8 = (s3+s2)*cPI2_8 + MOV r9, r9, ASR #8 + MUL r9, r14,r9 ; r9 = (s0+s1)*cPI2_8 + MOV r12,r12,ASR #8 + MUL r12,r14,r12 ; r12 = (s3-s2)*cPI2_8 + STMIA r1!,{r5,r8,r9,r12} + + ; block2 + LDMIA r4,{r5,r6,r9,r10} ; r5 = x[12] + ; r6 = x[13] + ; r9 = x[14] + ; r10= x[15] + LDMIA r1,{r7,r8,r11,r12} ; r7 = x[ 4] + ; r8 = x[ 5] + ; r11= x[ 6] + ; r12= x[ 7] + SUB r5, r5, r6 ; r5 = s2 = x[12] - x[13] + ADD r6, r5, r6, LSL #1 ; r6 = x[12] + x[13] -> x[12] + SUB r9, r9, r10 ; r9 = s3 = x[14] - x[15] + ADD r10,r9, r10,LSL #1 ; r10= x[14] + x[15] -> x[14] + SUB r14,r7, r8 ; r14= s0 = x[ 4] - x[ 5] + ADD r8, r14,r8, LSL #1 ; r8 = x[ 4] + x[ 5] -> x[13] + SUB r7, r12,r11 ; r7 = s1 = x[ 7] - x[ 6] + ADD r11,r7, r11, LSL #1 ; r11= x[ 7] + x[ 6] -> x[15] + STMIA r4!,{r6,r8,r10,r11} + STMIA r1!,{r5,r7,r9,r14} + + ; mdct_butterfly_8 + LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} + ; r6 = x[0] + ; r7 = x[1] + ; r8 = x[2] + ; r9 = x[3] + ; r10= x[4] + ; r11= x[5] + ; r12= x[6] + ; r14= x[7] + ADD r6, r6, r7 ; r6 = s0 = x[0] + x[1] + SUB r7, r6, r7, LSL #1 ; r7 = s1 = x[0] - x[1] + ADD r8, r8, r9 ; r8 = s2 = x[2] + x[3] + SUB r9, r8, r9, LSL #1 ; r9 = s3 = x[2] - x[3] + ADD r10,r10,r11 ; r10= s4 = x[4] + x[5] + SUB r11,r10,r11,LSL #1 ; r11= s5 = x[4] - x[5] + ADD r12,r12,r14 ; r12= s6 = x[6] + x[7] + SUB r14,r12,r14,LSL #1 ; r14= s7 = x[6] - x[7] + + ADD r2, r11,r9 ; r2 = x[0] = s5 + s3 + SUB r4, r2, r9, LSL #1 ; r4 = x[2] = s5 - s3 + SUB r3, r14,r7 ; r3 = x[1] = s7 - s1 + ADD r5, r3, r7, LSL #1 ; r5 = x[3] = s7 + s1 + SUB r10,r10,r6 ; r10= x[4] = s4 - s0 + SUB r11,r12,r8 ; r11= x[5] = s6 - s2 + ADD r12,r10,r6, LSL #1 ; r12= x[6] = s4 + s0 + ADD r14,r11,r8, LSL #1 ; r14= x[7] = s6 + s2 + STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} + + ; mdct_butterfly_8 + LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} + ; r6 = x[0] + ; r7 = x[1] + ; r8 = x[2] + ; r9 = x[3] + ; r10= x[4] + ; r11= x[5] + ; r12= x[6] + ; r14= x[7] + ADD r6, r6, r7 ; r6 = s0 = x[0] + x[1] + SUB r7, r6, r7, LSL #1 ; r7 = s1 = x[0] - x[1] + ADD r8, r8, r9 ; r8 = s2 = x[2] + x[3] + SUB r9, r8, r9, LSL #1 ; r9 = s3 = x[2] - x[3] + ADD r10,r10,r11 ; r10= s4 = x[4] + x[5] + SUB r11,r10,r11,LSL #1 ; r11= s5 = x[4] - x[5] + ADD r12,r12,r14 ; r12= s6 = x[6] + x[7] + SUB r14,r12,r14,LSL #1 ; r14= s7 = x[6] - x[7] + + ADD r2, r11,r9 ; r2 = x[0] = s5 + s3 + SUB r4, r2, r9, LSL #1 ; r4 = x[2] = s5 - s3 + SUB r3, r14,r7 ; r3 = x[1] = s7 - s1 + ADD r5, r3, r7, LSL #1 ; r5 = x[3] = s7 + s1 + SUB r10,r10,r6 ; r10= x[4] = s4 - s0 + SUB r11,r12,r8 ; r11= x[5] = s6 - s2 + ADD r12,r10,r6, LSL #1 ; r12= x[6] = s4 + s0 + ADD r14,r11,r8, LSL #1 ; r14= x[7] = s6 + s2 + STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} + + ADD r1,r1,#8*4 + SUBS r0,r0,#64 + BGT mdct_bufferflies_loop3 + + LDMFD r13,{r0-r3} + +mdct_bitreverse_arm_low + ; r0 = points + ; r1 = in + ; r2 = step + ; r3 = shift + + MOV r4, #0 ; r4 = bit = 0 + ADD r5, r1, r0, LSL #1 ; r5 = w = x + (n>>1) + ADR r6, bitrev + SUB r5, r5, #8 +brev_lp + LDRB r7, [r6, r4, LSR #6] + AND r8, r4, #0x3f + LDRB r8, [r6, r8] + ADD r4, r4, #1 ; bit++ + ; stall XScale + ORR r7, r7, r8, LSL #6 ; r7 = bitrev[bit] + MOV r7, r7, LSR r3 + ADD r9, r1, r7, LSL #2 ; r9 = xx = x + (b>>shift) + CMP r5, r9 ; if (w > xx) + LDR r10,[r5],#-8 ; r10 = w[0] w -= 2 + LDRGT r11,[r5,#12] ; r11 = w[1] + LDRGT r12,[r9] ; r12 = xx[0] + LDRGT r14,[r9,#4] ; r14 = xx[1] + STRGT r10,[r9] ; xx[0]= w[0] + STRGT r11,[r9,#4] ; xx[1]= w[1] + STRGT r12,[r5,#8] ; w[0] = xx[0] + STRGT r14,[r5,#12] ; w[1] = xx[1] + CMP r5,r1 + BGT brev_lp + + ; mdct_step7 + ; r0 = points + ; r1 = in + ; r2 = step + ; r3 = shift + + CMP r2, #4 ; r5 = T = (step>=4) ? + LDRGE r5, =sincos_lookup0 ; sincos_lookup0 + + LDRLT r5, =sincos_lookup1 ; sincos_lookup0 + + ADD r7, r1, r0, LSL #1 ; r7 = w1 = x + (n>>1) + ADDGE r5, r5, r2, LSR #1 ; (step>>1) + ADD r8, r5, #1024 ; r8 = Ttop +step7_loop1 + LDR r6, [r1] ; r6 = w0[0] + LDR r9, [r1,#4] ; r9 = w0[1] + LDR r10,[r7,#-8]! ; r10= w1[0] w1 -= 2 + LDR r11,[r7,#4] ; r11= w1[1] + LDRB r14,[r5,#1] ; r14= T[1] + LDRB r12,[r5],r2 ; r12= T[0] T += step + + ADD r6, r6, r10 ; r6 = s0 = w0[0] + w1[0] + SUB r10,r6, r10,LSL #1 ; r10= s1b= w0[0] - w1[0] + SUB r11,r11,r9 ; r11= s1 = w1[1] - w0[1] + ADD r9, r11,r9, LSL #1 ; r9 = s0b= w1[1] + w0[1] + + MOV r6, r6, ASR #9 + MUL r3, r6, r14 ; r3 = s0*T[1] + MOV r11,r11,ASR #9 + MUL r4, r11,r12 ; r4 += s1*T[0] = s2 + ADD r3, r3, r4 + MUL r14,r11,r14 ; r14 = s1*T[1] + MUL r12,r6, r12 ; r12 += s0*T[0] = s3 + SUB r14,r14,r12 + + ; r9 = s0b<<1 + ; r10= s1b<<1 + ADD r9, r3, r9, ASR #1 ; r9 = s0b + s2 + SUB r3, r9, r3, LSL #1 ; r3 = s0b - s2 + + SUB r12,r14,r10,ASR #1 ; r12= s3 - s1b + ADD r10,r14,r10,ASR #1 ; r10= s3 + s1b + STR r9, [r1],#4 + STR r10,[r1],#4 ; w0 += 2 + STR r3, [r7] + STR r12,[r7,#4] + + CMP r5,r8 + BLT step7_loop1 + +step7_loop2 + LDR r6, [r1] ; r6 = w0[0] + LDR r9, [r1,#4] ; r9 = w0[1] + LDR r10,[r7,#-8]! ; r10= w1[0] w1 -= 2 + LDR r11,[r7,#4] ; r11= w1[1] + LDRB r14,[r5,-r2]! ; r12= T[1] T -= step + LDRB r12,[r5,#1] ; r14= T[0] + + ADD r6, r6, r10 ; r6 = s0 = w0[0] + w1[0] + SUB r10,r6, r10,LSL #1 ; r10= s1b= w0[0] - w1[0] + SUB r11,r11,r9 ; r11= s1 = w1[1] - w0[1] + ADD r9, r11,r9, LSL #1 ; r9 = s0b= w1[1] + w0[1] + + MOV r6, r6, ASR #9 + MUL r3, r6, r14 ; r3 = s0*T[0] + MOV r11,r11,ASR #9 + MUL r4, r11,r12 ; r4 += s1*T[1] = s2 + ADD r3, r3, r4 + MUL r14,r11,r14 ; r14 = s1*T[0] + MUL r12,r6, r12 ; r12 += s0*T[1] = s3 + SUB r14,r14,r12 + + ; r9 = s0b<<1 + ; r10= s1b<<1 + ADD r9, r3, r9, ASR #1 ; r9 = s0b + s2 + SUB r3, r9, r3, LSL #1 ; r3 = s0b - s2 + + SUB r12,r14,r10,ASR #1 ; r12= s3 - s1b + ADD r10,r14,r10,ASR #1 ; r10= s3 + s1b + STR r9, [r1],#4 + STR r10,[r1],#4 ; w0 += 2 + STR r3, [r7] + STR r12,[r7,#4] + + CMP r1,r7 + BLT step7_loop2 + + LDMFD r13!,{r0-r3} + + ; r0 = points + ; r1 = in + ; r2 = step + ; r3 = shift + MOV r2, r2, ASR #2 ; r2 = step >>= 2 + CMP r2, #0 + CMPNE r2, #1 + BEQ mdct_end + + ; step > 1 (default case) + CMP r2, #4 ; r5 = T = (step>=4) ? + LDRGE r5, =sincos_lookup0 ; sincos_lookup0 + + LDRLT r5, =sincos_lookup1 ; sincos_lookup1 + ADD r7, r1, r0, LSL #1 ; r7 = iX = x + (n>>1) + ADDGE r5, r5, r2, LSR #1 ; (step>>1) +mdct_step8_default + LDR r6, [r1],#4 ; r6 = s0 = x[0] + LDR r8, [r1],#4 ; r8 = -s1 = x[1] + LDRB r12,[r5,#1] ; r12= T[1] + LDRB r14,[r5],r2 ; r14= T[0] T += step + RSB r8, r8, #0 ; r8 = s1 + + ; XPROD31(s0, s1, T[0], T[1], x, x+1) + ; x[0] = s0 * T[0] + s1 * T[1] x[1] = s1 * T[0] - s0 * T[1] + MOV r6, r6, ASR #8 + MOV r8, r8, ASR #8 + MUL r10,r8, r12 ; r10 = s1 * T[1] + CMP r1, r7 + MLA r10,r6, r14,r10 ; r10 += s0 * T[0] + RSB r6, r6, #0 ; r6 = -s0 + MUL r11,r8, r14 ; r11 = s1 * T[0] + MLA r11,r6, r12,r11 ; r11 -= s0 * T[1] + STR r10,[r1,#-8] + STR r11,[r1,#-4] + BLT mdct_step8_default + +mdct_end + MOV r0, r2 + LDMFD r13!,{r4-r11,PC} + +bitrev + DCB 0 + DCB 32 + DCB 16 + DCB 48 + DCB 8 + DCB 40 + DCB 24 + DCB 56 + DCB 4 + DCB 36 + DCB 20 + DCB 52 + DCB 12 + DCB 44 + DCB 28 + DCB 60 + DCB 2 + DCB 34 + DCB 18 + DCB 50 + DCB 10 + DCB 42 + DCB 26 + DCB 58 + DCB 6 + DCB 38 + DCB 22 + DCB 54 + DCB 14 + DCB 46 + DCB 30 + DCB 62 + DCB 1 + DCB 33 + DCB 17 + DCB 49 + DCB 9 + DCB 41 + DCB 25 + DCB 57 + DCB 5 + DCB 37 + DCB 21 + DCB 53 + DCB 13 + DCB 45 + DCB 29 + DCB 61 + DCB 3 + DCB 35 + DCB 19 + DCB 51 + DCB 11 + DCB 43 + DCB 27 + DCB 59 + DCB 7 + DCB 39 + DCB 23 + DCB 55 + DCB 15 + DCB 47 + DCB 31 + DCB 63 + + END |