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P1: fix Zig FFI to build and match the Idris2 ABI #37

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Merged
hyperpolymath merged 1 commit into from
Jun 26, 2026
Merged

P1: fix Zig FFI to build and match the Idris2 ABI #37

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8 changes: 4 additions & 4 deletions src/interface/ffi/src/main.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,7 @@ export fn betlangiser_init() ?*anyopaque {
engine.* = .{
.allocator = allocator,
.initialized = true,
.prng = std.Random.DefaultPrng.init(@bitCast(std.time.nanoTimestamp())),
.prng = std.Random.DefaultPrng.init(@truncate(@as(u128, @bitCast(std.time.nanoTimestamp())))),
.distributions = std.ArrayList(*Distribution).init(allocator),
};

Expand Down Expand Up @@ -555,9 +555,9 @@ fn sampleDistribution(engine: *Engine, dist: *const Distribution) f64 {
return switch (dist.tag) {
.normal => blk: {
// Box-Muller transform for normal sampling
const u1 = random.float(f64);
const u2 = random.float(f64);
const z = @sqrt(-2.0 * @log(u1)) * @cos(2.0 * std.math.pi * u2);
const unif1 = random.float(f64);
const unif2 = random.float(f64);
const z = @sqrt(-2.0 * @log(unif1)) * @cos(2.0 * std.math.pi * unif2);
break :blk dist.param1 + dist.param2 * z;
},
.uniform => dist.param1 + (dist.param2 - dist.param1) * random.float(f64),
Expand Down
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