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(utils_neon) Don't use callee-save registers

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notaz 2012-12-09 18:58:47 +02:00
parent 17f42531c3
commit f6de3722ef
1 changed files with 17 additions and 17 deletions
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34
audio/utils_neon.S
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@ -22,11 +22,11 @@ audio_convert_s16_float_asm:
# Hacky way to get a constant of 2^-15.
# Might be faster to just load a constant from memory.
# It's just done once however ...
vmov.f32 q5, #0.25
vmul.f32 q5, q5, q5
vmul.f32 q5, q5, q5
vmul.f32 q5, q5, q5
vadd.f32 q5, q5, q5
vmov.f32 q8, #0.25
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q8
vadd.f32 q8, q8, q8
1:
# Preload here?
@ -37,13 +37,13 @@ audio_convert_s16_float_asm:
vmovl.s16 q2, d1
# Convert to float
vcvt.f32.s32 q3, q1
vcvt.f32.s32 q4, q2
vcvt.f32.s32 q1, q1
vcvt.f32.s32 q2, q2
vmul.f32 q3, q3, q5
vmul.f32 q4, q4, q5
vmul.f32 q1, q1, q8
vmul.f32 q2, q2, q8
vst1.f32 {q3-q4}, [r0]!
vst1.f32 {q1-q2}, [r0]!
# Guaranteed to get samples in multiples of 8.
subs r2, r2, #8
@ -57,18 +57,18 @@ audio_convert_s16_float_asm:
audio_convert_float_s16_asm:
# Hacky way to get a constant of 2^15.
# ((2^4)^2)^2 * 0.5 = 2^15
vmov.f32 q5, #16.0
vmov.f32 q6, #0.5
vmul.f32 q5, q5, q5
vmul.f32 q5, q5, q5
vmul.f32 q5, q5, q6
vmov.f32 q8, #16.0
vmov.f32 q9, #0.5
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q8
vmul.f32 q8, q8, q9
1:
# Preload here?
vld1.f32 {q0-q1}, [r1]!
vmul.f32 q0, q0, q5
vmul.f32 q1, q1, q5
vmul.f32 q0, q0, q8
vmul.f32 q1, q1, q8
vcvt.s32.f32 q0, q0
vcvt.s32.f32 q1, q1