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fix(templates): add denormalization to compressor filter

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vsariola 2021-03-24 22:05:00 +02:00
parent 0c2b1a3856
commit b0918e65ff
1 changed files with 4 additions and 0 deletions
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templates/amd64-386/effects.asm
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@ -361,6 +361,10 @@ su_op_compressor_mono:
{{.Call "su_nonlinear_map"}} ; c x^2-l x, c is either attack or release parameter mapped in a nonlinear way
fmulp st1, st0 ; c*(x^2-l) x
fadd dword [{{.WRK}}] ; l+c*(x^2-l) x // we could've kept level in the stack and save a few bytes, but su_env_map uses 3 stack (c + 2 temp), so the stack was getting quite big.
; TODO: make this denormalization optional, if the user wants to save some space
{{- .Float 0.5 | .Prepare | indent 4}}
fadd dword [{{.Float 0.5 | .Use}}] ; add and sub small offset to prevent denormalization. WARNING: this is highly important, as the damp filters might denormalize and give 100x CPU penalty
fsub dword [{{.Float 0.5 | .Use}}] ; See for example: https://stackoverflow.com/questions/36781881/why-denormalized-floats-are-so-much-slower-than-other-floats-from-hardware-arch
fst dword [{{.WRK}}] ; l'=l+c*(x^2-l), l' x
fld dword [{{.Input "compressor" "threshold"}}] ; t l' x
fmul st0, st0 ; t*t l' x