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hMultiplicand is four bytes internally, but the high byte is always 0 since allowing four-byte multiplicands could overflow hProduct.

This commit is contained in:
Rangi 2018-09-09 15:10:38 -04:00
parent ae022e1420
commit 9ee2b59208
1 changed files with 4 additions and 4 deletions
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8
engine/math/math.asm
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@ -4,7 +4,7 @@ _Multiply::
ld b, a ld b, a
xor a xor a
ldh [hProduct], a ldh [hMultiplicand - 1], a
ldh [hMathBuffer + 1], a ldh [hMathBuffer + 1], a
ldh [hMathBuffer + 2], a ldh [hMathBuffer + 2], a
ldh [hMathBuffer + 3], a ldh [hMathBuffer + 3], a
@ -36,7 +36,7 @@ _Multiply::
ldh a, [hMathBuffer + 1] ldh a, [hMathBuffer + 1]
ld c, a ld c, a
ldh a, [hProduct] ldh a, [hMultiplicand - 1]
adc c adc c
ldh [hMathBuffer + 1], a ldh [hMathBuffer + 1], a
@ -58,9 +58,9 @@ _Multiply::
rla rla
ldh [hMultiplicand + 0], a ldh [hMultiplicand + 0], a
ldh a, [hProduct] ldh a, [hMultiplicand - 1]
rla rla
ldh [hProduct], a ldh [hMultiplicand - 1], a
jr .loop jr .loop