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Addressing webrtc issue 1237, http://code.google.com/p/webrtc/issues/detail?id=1237.

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Code compared to C. Bit-exact.
Review URL: https://webrtc-codereview.appspot.com/1021004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3333 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
kma@webrtc.org
2013-01-04 17:40:21 +00:00
parent 91d893324f
commit f545cf8f10
1 changed files with 43 additions and 17 deletions
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60
webrtc/modules/audio_processing/ns/nsx_core_neon.S
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@ -423,10 +423,12 @@ LOOP_MAGNLEN:
strh r7, [r2]
strh r8, [r4]
ldr r5, [r0, #offset_nsx_anaLen2] @ inst->anaLen2
ldr r5, [r0, #offset_nsx_anaLen2] @ inst->anaLen2
ldr r7, [r0, #offset_nsx_anaLen] @ inst->anaLen
add r5, r3, r5, lsl #1 @ &inst->real[inst->anaLen2]
lsr r5, #3 @ inst->anaLen2 / 8
sub r5, #1 @ Loop counter.
@ Process and write the first 2 samples into freq_buf[].
ldrh r2, [r3], #2 @ inst->real[0]
ldrh r0, [r9] @ inst->imag[0]
strh r2, [r1], #2 @ Store to freq_buf[0]
@ -438,28 +440,52 @@ LOOP_MAGNLEN:
mvn r12, #0x1F @ -32
@ At the last iteration, &freq_buf[inst->anaLen + 1] will be written to by both
@ the vst1 instructions. Only the 2nd vst1 instruction has the correct value
@ (-inst->imag[inst->anaLen2]), so the order of the two vst1's is important.
@ Process and write (inst->anaLen2 * 4 - 32) samples into freq_buf[].
LOOP_ANALEN2:
vld1.16 {d0, d1}, [r3]! @ inst->real[], starting from inst->real[1]
vld1.16 {d2, d3}, [r6]! @ inst->imag[], starting from inst->imag[1]
vmov.s16 d4, d0
vld1.16 d3, [r3]! @ inst->real[], starting from inst->real[1]
vld1.16 d1, [r3]!
vmov.s16 d4, d3
vld1.16 d2, [r6]! @ inst->imag[], starting from inst->imag[1]
vmov.s16 d6, d1
vneg.s16 d5, d2
vneg.s16 d7, d3
vzip.16 d0, d2
vzip.16 d1, d3
vld1.16 d0, [r6]!
vneg.s16 d7, d0
vzip.16 d1, d0
vzip.16 d3, d2
vzip.16 d4, d5
vrev64.32 q8, q0
vrev64.32 q9, q1
vzip.16 d6, d7
vrev64.32 d16, d3
vrev64.32 d17, d1
vrev64.32 d18, d2
vrev64.32 d19, d0
cmp r3, r5
subs r5, #1
vst1.16 {d16, d17, d18, d19}, [r2], r12
vst1.16 {d4, d5, d6, d7}, [r1]!
bls LOOP_ANALEN2
bgt LOOP_ANALEN2
@ Process and write 32 samples into freq_buf[]. We need to adjust the pointers
@ to overwrite the 2 starting samples in the back half of the buffer.
sub r0, r3, #2
sub r4, r6, #2
add r2, #4
vld1.16 d3, [r3]! @ inst->real[], starting from inst->real[1]
vld1.16 d1, [r3]!
vmov.s16 d4, d3
vld1.16 d2, [r6]! @ inst->imag[], starting from inst->imag[1]
vmov.s16 d6, d1
vld1.16 d0, [r6]!
vneg.s16 d5, d2
vld1.16 d23, [r0]! @ inst->real[], starting from inst->real[1]
vneg.s16 d7, d0
vld1.16 d21, [r0]
vzip.16 d4, d5
vld1.16 d22, [r4]! @ inst->imag[], starting from inst->imag[1]
vld1.16 d20, [r4]
vzip.16 d23, d22
vzip.16 d21, d20
vzip.16 d6, d7
vrev64.32 q8, q10
vrev64.32 q9, q11
vst1.16 {d4, d5, d6, d7}, [r1]
vst1.16 {d16, d17, d18, d19}, [r2]
pop {r4-r8}
bx r14