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stage2-wasm: bigint abs + test min/max

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Pavel Verigo
2026-04-07 00:25:49 +02:00
parent 0ebd270d90
commit df79ea941b
4 changed files with 140 additions and 1 deletions
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lib/compiler_rt/limb64.zig
+50
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@@ -977,3 +977,53 @@ test __mulo_limb64 {
try test__mulo_limb64(i200, maxInt(i200), maxInt(i200), .{ 1, true });
try test__mulo_limb64(i200, minInt(i200), minInt(i200), .{ 0, true });
}
comptime {
symbol(&__abs_limb64, "__abs_limb64");
}
fn __abs_limb64(out_ptr: [*]u64, a_ptr: [*]const u64, bits: u16) callconv(.c) void {
const limb_cnt = limbCount(bits);
const out = out_ptr[0..limb_cnt];
const a = a_ptr[0..limb_cnt];
const ms = limbGet(a, limb_cnt - 1);
if ((ms >> 63) == 0) {
@memcpy(out, a);
return;
}
var carry: u1 = 1;
var i: usize = 0;
while (i < limb_cnt) : (i += 1) {
const s = @addWithOverflow(~limbGet(a, i), carry);
limbSet(out, i, s[0]);
carry = s[1];
}
}
fn test__abs_limb64(comptime T: type, a: T, expected: @Int(.unsigned, @typeInfo(T).int.bits)) !void {
const int_info = @typeInfo(T).int;
comptime assert(int_info.signedness == .signed);
var a_limbs = asLimbs(a);
var out: Limbs(@TypeOf(expected)) = undefined;
__abs_limb64(&out, &a_limbs, int_info.bits);
const expected_limbs = asLimbs(expected);
try testing.expectEqual(expected_limbs, out);
}
test __abs_limb64 {
try test__abs_limb64(i64, 0, 0);
try test__abs_limb64(i64, -1, 1);
try test__abs_limb64(i64, minInt(i64), 1 << 63);
try test__abs_limb64(i65, -1, 1);
try test__abs_limb64(i65, minInt(i65), 1 << 64);
try test__abs_limb64(i65, maxInt(i65), maxInt(i65));
try test__abs_limb64(i128, -1 << 80, 1 << 80);
try test__abs_limb64(i128, 1 << 64, 1 << 64);
try test__abs_limb64(i200, -1 << 198, 1 << 198);
try test__abs_limb64(i255, -5, 5);
try test__abs_limb64(i255, minInt(i255), 1 << 254);
}