--- /dev/null
+;
+; Copyright (c) 2011 The WebM project authors. All Rights Reserved.
+;
+; Use of this source code is governed by a BSD-style license
+; that can be found in the LICENSE file in the root of the source
+; tree. An additional intellectual property rights grant can be found
+; in the file PATENTS. All contributing project authors may
+; be found in the AUTHORS file in the root of the source tree.
+;
+
+
+ EXPORT |vp8_fast_quantize_b_armv6|
+
+ INCLUDE asm_enc_offsets.asm
+
+ ARM
+ REQUIRE8
+ PRESERVE8
+
+ AREA ||.text||, CODE, READONLY, ALIGN=2
+
+; r0 BLOCK *b
+; r1 BLOCKD *d
+|vp8_fast_quantize_b_armv6| PROC
+ stmfd sp!, {r1, r4-r11, lr}
+
+ ldr r3, [r0, #vp8_block_coeff] ; coeff
+ ldr r4, [r0, #vp8_block_quant_fast] ; quant_fast
+ ldr r5, [r0, #vp8_block_round] ; round
+ ldr r6, [r1, #vp8_blockd_qcoeff] ; qcoeff
+ ldr r7, [r1, #vp8_blockd_dqcoeff] ; dqcoeff
+ ldr r8, [r1, #vp8_blockd_dequant] ; dequant
+
+ ldr r2, loop_count ; loop_count=0x1000000. 'lsls' instruction
+ ; is used to update the counter so that
+ ; it can be used to mark nonzero
+ ; quantized coefficient pairs.
+
+ mov r1, #0 ; flags for quantized coeffs
+
+ ; PART 1: quantization and dequantization loop
+loop
+ ldr r9, [r3], #4 ; [z1 | z0]
+ ldr r10, [r5], #4 ; [r1 | r0]
+ ldr r11, [r4], #4 ; [q1 | q0]
+
+ ssat16 lr, #1, r9 ; [sz1 | sz0]
+ eor r9, r9, lr ; [z1 ^ sz1 | z0 ^ sz0]
+ ssub16 r9, r9, lr ; x = (z ^ sz) - sz
+ sadd16 r9, r9, r10 ; [x1+r1 | x0+r0]
+
+ ldr r12, [r3], #4 ; [z3 | z2]
+
+ smulbb r0, r9, r11 ; [(x0+r0)*q0]
+ smultt r9, r9, r11 ; [(x1+r1)*q1]
+
+ ldr r10, [r5], #4 ; [r3 | r2]
+
+ ssat16 r11, #1, r12 ; [sz3 | sz2]
+ eor r12, r12, r11 ; [z3 ^ sz3 | z2 ^ sz2]
+ pkhtb r0, r9, r0, asr #16 ; [y1 | y0]
+ ldr r9, [r4], #4 ; [q3 | q2]
+ ssub16 r12, r12, r11 ; x = (z ^ sz) - sz
+
+ sadd16 r12, r12, r10 ; [x3+r3 | x2+r2]
+
+ eor r0, r0, lr ; [(y1 ^ sz1) | (y0 ^ sz0)]
+
+ smulbb r10, r12, r9 ; [(x2+r2)*q2]
+ smultt r12, r12, r9 ; [(x3+r3)*q3]
+
+ ssub16 r0, r0, lr ; x = (y ^ sz) - sz
+
+ cmp r0, #0 ; check if zero
+ orrne r1, r1, r2, lsr #24 ; add flag for nonzero coeffs
+
+ str r0, [r6], #4 ; *qcoeff++ = x
+ ldr r9, [r8], #4 ; [dq1 | dq0]
+
+ pkhtb r10, r12, r10, asr #16 ; [y3 | y2]
+ eor r10, r10, r11 ; [(y3 ^ sz3) | (y2 ^ sz2)]
+ ssub16 r10, r10, r11 ; x = (y ^ sz) - sz
+
+ cmp r10, #0 ; check if zero
+ orrne r1, r1, r2, lsr #23 ; add flag for nonzero coeffs
+
+ str r10, [r6], #4 ; *qcoeff++ = x
+ ldr r11, [r8], #4 ; [dq3 | dq2]
+
+ smulbb r12, r0, r9 ; [x0*dq0]
+ smultt r0, r0, r9 ; [x1*dq1]
+
+ smulbb r9, r10, r11 ; [x2*dq2]
+ smultt r10, r10, r11 ; [x3*dq3]
+
+ lsls r2, r2, #2 ; update loop counter
+ strh r12, [r7, #0] ; dqcoeff[0] = [x0*dq0]
+ strh r0, [r7, #2] ; dqcoeff[1] = [x1*dq1]
+ strh r9, [r7, #4] ; dqcoeff[2] = [x2*dq2]
+ strh r10, [r7, #6] ; dqcoeff[3] = [x3*dq3]
+ add r7, r7, #8 ; dqcoeff += 8
+ bne loop
+
+ ; PART 2: check position for eob...
+ mov lr, #0 ; init eob
+ cmp r1, #0 ; coeffs after quantization?
+ ldr r11, [sp, #0] ; restore BLOCKD pointer
+ beq end ; skip eob calculations if all zero
+
+ ldr r0, [r11, #vp8_blockd_qcoeff]
+
+ ; check shortcut for nonzero qcoeffs
+ tst r1, #0x80
+ bne quant_coeff_15_14
+ tst r1, #0x20
+ bne quant_coeff_13_11
+ tst r1, #0x8
+ bne quant_coeff_12_7
+ tst r1, #0x40
+ bne quant_coeff_10_9
+ tst r1, #0x10
+ bne quant_coeff_8_3
+ tst r1, #0x2
+ bne quant_coeff_6_5
+ tst r1, #0x4
+ bne quant_coeff_4_2
+ b quant_coeff_1_0
+
+quant_coeff_15_14
+ ldrh r2, [r0, #30] ; rc=15, i=15
+ mov lr, #16
+ cmp r2, #0
+ bne end
+
+ ldrh r3, [r0, #28] ; rc=14, i=14
+ mov lr, #15
+ cmp r3, #0
+ bne end
+
+quant_coeff_13_11
+ ldrh r2, [r0, #22] ; rc=11, i=13
+ mov lr, #14
+ cmp r2, #0
+ bne end
+
+quant_coeff_12_7
+ ldrh r3, [r0, #14] ; rc=7, i=12
+ mov lr, #13
+ cmp r3, #0
+ bne end
+
+ ldrh r2, [r0, #20] ; rc=10, i=11
+ mov lr, #12
+ cmp r2, #0
+ bne end
+
+quant_coeff_10_9
+ ldrh r3, [r0, #26] ; rc=13, i=10
+ mov lr, #11
+ cmp r3, #0
+ bne end
+
+ ldrh r2, [r0, #24] ; rc=12, i=9
+ mov lr, #10
+ cmp r2, #0
+ bne end
+
+quant_coeff_8_3
+ ldrh r3, [r0, #18] ; rc=9, i=8
+ mov lr, #9
+ cmp r3, #0
+ bne end
+
+ ldrh r2, [r0, #12] ; rc=6, i=7
+ mov lr, #8
+ cmp r2, #0
+ bne end
+
+quant_coeff_6_5
+ ldrh r3, [r0, #6] ; rc=3, i=6
+ mov lr, #7
+ cmp r3, #0
+ bne end
+
+ ldrh r2, [r0, #4] ; rc=2, i=5
+ mov lr, #6
+ cmp r2, #0
+ bne end
+
+quant_coeff_4_2
+ ldrh r3, [r0, #10] ; rc=5, i=4
+ mov lr, #5
+ cmp r3, #0
+ bne end
+
+ ldrh r2, [r0, #16] ; rc=8, i=3
+ mov lr, #4
+ cmp r2, #0
+ bne end
+
+ ldrh r3, [r0, #8] ; rc=4, i=2
+ mov lr, #3
+ cmp r3, #0
+ bne end
+
+quant_coeff_1_0
+ ldrh r2, [r0, #2] ; rc=1, i=1
+ mov lr, #2
+ cmp r2, #0
+ bne end
+
+ mov lr, #1 ; rc=0, i=0
+
+end
+ str lr, [r11, #vp8_blockd_eob]
+ ldmfd sp!, {r1, r4-r11, pc}
+
+ ENDP
+
+loop_count
+ DCD 0x1000000
+
+ END
+
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