DSP LLE Recompiler: Fix LOOP and BLOOP when the counter is between 0x8001 and 0xFFFF #10723
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I dunno what the hardware does but this looks right with regards to matching the recompiler to the interpreter. |
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The loop ends when the counter reaches 0, and the counter is unsigned; before, it was doing a signed 16-bit comparison if the value was less than or equal to 0 after subtracting 1 from the value.
This wasn't caught by #10716 because the saturation results in a value of 0x7fff or 0x8000, neither of which trigger the bug.
I ran into this when investigating the CARD uCode, as it ends up using BLOOP with a counter set to 0xFFFF if the input length is set to 0. (This isn't something that happens in practice (as far as I can tell the input length is always 8 normally), nor is it behavior that seems intended, but it confused me because the interpreter and recompiler were giving different results.)