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fix(vm): avoid NaNs in trisaw oscillator

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5684185+vsariola@users.noreply.github.com
2026-02-28 16:41:39 +02:00
parent 92859a5e58
commit 4d29a191c8
3 changed files with 19 additions and 13 deletions
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5
vm/compiler/templates/amd64-386/sources.asm
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@ -269,7 +269,10 @@ su_oscillat_pulse_up:
{{- if .HasCall "su_oscillat_trisaw"}}
{{.Func "su_oscillat_trisaw"}}
fucomi st1 ; // c p
jnc short su_oscillat_trisaw_up
; we do jnbe instead of jnc to avoid NaN. phase cannot be < 0 or >= 1, so the important cases are
; c = 0 => the branch is never taken, because c > p can never happen, and thus results in .../(1-c)
; c = 1 => the branch is always taken, because p < c and thus always gives .../c
jnbe short su_oscillat_trisaw_up
fld1 ; // 1 c p
fsubr st2, st0 ; // 1 c 1-p
fsubrp st1, st0 ; // 1-c 1-p