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fix i128 division?

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This commit is contained in:
Laytan
2024-08-20 19:00:49 +02:00
parent daa0779c01
commit 8f2d3dc955
1 changed files with 22 additions and 4 deletions
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26
base/runtime/internal.odin
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@@ -1014,14 +1014,32 @@ modti3 :: proc "c" (a, b: i128) -> i128 {
@(link_name="__divmodti4", linkage=RUNTIME_LINKAGE, require=RUNTIME_REQUIRE)
divmodti4 :: proc "c" (a, b: i128, rem: ^i128) -> i128 {
u := udivmod128(u128(a), u128(b), (^u128)(rem))
return i128(u)
s_a := a >> (128 - 1) // -1 if negative or 0
s_b := b >> (128 - 1)
an := (a ~ s_a) - s_a // absolute
bn := (b ~ s_b) - s_b
s_b ~= s_a // quotient sign
u_s_b := u128(s_b)
u_s_a := u128(s_a)
r: u128 = ---
u := i128((udivmodti4(u128(an), u128(bn), &r) ~ u_s_b) - u_s_b) // negate if negative
rem^ = i128((r ~ u_s_a) - u_s_a)
return u
}
@(link_name="__divti3", linkage=RUNTIME_LINKAGE, require=RUNTIME_REQUIRE)
divti3 :: proc "c" (a, b: i128) -> i128 {
u := udivmodti4(u128(a), u128(b), nil)
return i128(u)
s_a := a >> (128 - 1) // -1 if negative or 0
s_b := b >> (128 - 1)
an := (a ~ s_a) - s_a // absolute
bn := (b ~ s_b) - s_b
s_a ~= s_b // quotient sign
u_s_a := u128(s_a)
return i128((udivmodti4(u128(an), u128(bn), nil) ~ u_s_a) - u_s_a) // negate if negative
}