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Fix two bugs with RGBASM fixed-point math (#1388)

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- Fixed-point formulas are implemented using IEEE-754 floating-point
  internally, which could give infinity or NaN values whose conversion
  to fixed-point integer was platform-dependent.
- Formatting fixed-point $8000_0000 (INT32_MIN, -2147483648) was
  not putting the negative sign in front.
This commit is contained in:
Sylvie
2024-03-31 12:53:20 -04:00
committed by GitHub
parent 6b5248f15b
commit 9ab3446d1a
5 changed files with 36 additions and 12 deletions
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8
test/asm/math.asm
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@@ -19,14 +19,18 @@ ENDM
assert DIV(5.0, 2.0) == 2.5
assert DIV(-5.0, 2.0) == -2.5
assert DIV(-5.0, 0.0) == $8000_0000
assert DIV(5.0, 0.0) == $7fff_ffff ; +inf => INT32_MAX
assert DIV(-5.0, 0.0) == $8000_0000 ; -inf => INT32_MIN
assert DIV(0.0, 0.0) == $0000_0000 ; nan => 0
assert MUL(10.0, 0.5) == 5.0
assert MUL(10.0, 0.0) == 0.0
assert FMOD(5.0, 2.0) == 1.0
assert FMOD(-5.0, 2.0) == -1.0
assert FMOD(-5.0, 0.0) == $8000_0000
assert FMOD(5.0, 0.0) == 0 ; nan
assert FMOD(-5.0, 0.0) == 0 ; nan
assert FMOD(0.0, 0.0) == 0 ; nan
assert POW(10.0, 2.0) == 100.0
assert POW(100.0, 0.5) == 10.0