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Implement log2 and log functions in math.tact #166

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merged 7 commits into from
Mar 21, 2024
Merged

Implement log2 and log functions in math.tact #166

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aedc81d
implement `log2` and `log` functions in math.tact
Gusarich Mar 4, 2024
b4fb803
update changelog
Gusarich Mar 4, 2024
14963bb
update snapshots
Gusarich Mar 5, 2024
207d90c
fix test
Gusarich Mar 5, 2024
708cadc
rework `log` function
Gusarich Mar 18, 2024
dc741ae
Update src/generator/writers/writeStdlib.ts
Gusarich Mar 20, 2024
5e914a5
fix
Gusarich Mar 21, 2024
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30 changes: 27 additions & 3 deletions src/generator/writers/__snapshots__/writeSerialization.spec.ts.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -2986,7 +2986,15 @@ return b.end_cell().begin_parse();",
},
{
"code": {
"code": "return __tact_log2(num) / __tact_log2(base);",
"code": "if (num < base) {
return 0;
}
int result = 0;
while (num >= base) {
num = num / base;
result += 1;
}
return result;",
"kind": "generic",
},
"comment": null,
Expand Down Expand Up @@ -6833,7 +6841,15 @@ return b.end_cell().begin_parse();",
},
{
"code": {
"code": "return __tact_log2(num) / __tact_log2(base);",
"code": "if (num < base) {
return 0;
}
int result = 0;
while (num >= base) {
num = num / base;
result += 1;
}
return result;",
"kind": "generic",
},
"comment": null,
Expand Down Expand Up @@ -10680,7 +10696,15 @@ return b.end_cell().begin_parse();",
},
{
"code": {
"code": "return __tact_log2(num) / __tact_log2(base);",
"code": "if (num < base) {
return 0;
}
int result = 0;
while (num >= base) {
num = num / base;
result += 1;
}
return result;",
"kind": "generic",
},
"comment": null,
Expand Down
10 changes: 9 additions & 1 deletion src/generator/writers/writeStdlib.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1235,7 +1235,15 @@ export function writeStdlib(ctx: WriterContext) {
ctx.context('stdlib');
ctx.body(() => {
ctx.write(`
return __tact_log2(num) / __tact_log2(base);
if (num < base) {
return 0;
}
int result = 0;
while (num >= base) {
num = num / base;
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result += 1;
}
return result;
`);
});
});
Expand Down
49 changes: 45 additions & 4 deletions src/test/feature-math.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -348,10 +348,51 @@ describe('feature-math', () => {

for (let num = 1n; num <= 10n; num++) {
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for (let base = 2n; base <= 10; base++) {
const a = Math.floor(Math.log2(Number(num)));
const b = Math.floor(Math.log2(Number(base)));
const c = BigInt(Math.floor(a / b));
expect(await contract.getLog(num, base)).toBe(c);
const logarithm = BigInt(
Math.floor(Math.log2(Number(num)) / Math.log2(Number(base)))
);
expect(await contract.getLog(num, base)).toBe(logarithm);
}
}

expect(await contract.getLog2(0n)).toBe(-1n);
expect(await contract.getLog(0n, 2n)).toBe(0n);

const maxint = 2n ** 256n - 1n;

function bigIntLogBase(num: bigint, base: bigint) {
let result = 0n;
while (num >= base) {
num = num / base;
result += 1n;
}
return result;
}
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for (let num = maxint - 100n; num <= maxint; num++) {
expect(await contract.getLog2(num)).toBe(255n);
}

for (let num = maxint - 10n; num <= maxint; num++) {
for (let base = 2n; base <= 10; base++) {
expect(await contract.getLog(num, base)).toBe(
bigIntLogBase(num, base)
);
}
}

for (let num = maxint / 2n - 50n; num <= maxint / 2n; num++) {
expect(await contract.getLog2(num)).toBe(254n);
}
for (let num = maxint / 2n + 1n; num <= maxint / 2n + 50n; num++) {
expect(await contract.getLog2(num)).toBe(255n);
}

for (let num = maxint / 2n - 5n; num <= maxint / 2n + 5n; num++) {
for (let base = 2n; base <= 10; base++) {
expect(await contract.getLog(num, base)).toBe(
bigIntLogBase(num, base)
);
}
}
});
Expand Down
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