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battle-anim: fix UB by subtracting by 16 #1839

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The current code follows the nonsensical asm
generated by agbcc, which converted a
subtraction by 16 into an addition by
a halfword value of -16.

This conversion happened at the
portion of the compiler
that does platform-specific transformations.

This code in C is UB,
as it relies on overflowing of a negative value.

Signed-off-by:Arven

The current code follows the nonsensical asm
generated by agbcc, which converted a
subtraction by 16 into an addition by
a halfword value of -16.

This conversion happened at the
portion of the compiler
that does platform-specific transformations.

This code in C is UB,
as it relies on overflowing of a negative value.

Signed-off-by:Arven
@AreaZeroArven AreaZeroArven changed the title battle-anim:fix UB by subtracting by 16 battle-anim: fix UB by subtracting by 16 Jan 6, 2023
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