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fix for floating point subtraction, started work on multiplication

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FeralChild64 committed 2020-02-17 17:19:32 +01:00
1 parent 00fdc397c0
commit 79da285575
8 files changed
+107 -39
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c64/basic/math/add_FAC2_FAC1_sub.s
+3 -13
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@@ -12,7 +12,7 @@
add_FAC2_FAC1_sub:
// First verify that |FAC1| > |FAC2|, branch to proper variant if it is not
// Note, that exponents are laready equalized
// We ignore FACOV here. Note, that exponents are already equalized
lda FAC1_mantissa+0
cmp FAC2_mantissa+0
@@ -59,9 +59,7 @@ add_FAC2_FAC1_sub:
sbc FAC2_mantissa+0
sta FAC1_mantissa+0
bcs add_FAC2_FAC1_sub_normalize // end if no need to adapt the exponent
dec FAC1_exponent
// Exponent should never need adaptation here
jmp normal_FAC1
@@ -94,14 +92,6 @@ add_FAC2_FAC1_sub_rev:
sbc FAC1_mantissa+0
sta FAC1_mantissa+0
bcs add_FAC2_FAC1_sub_normalize // end if no need to adapt the exponent
lda FAC2_exponent
sta FAC1_exponent
dec FAC1_exponent
// FALLTROUGH
add_FAC2_FAC1_sub_normalize:
// Exponent should never need adaptation here
jmp normal_FAC1