stage2 array access performance (boundchecks related?) #12215
Description
Zig Version
0.10.0-dev.3286+9ec3f611c
Steps to Reproduce
const std = @import("std");
test {
const array = try std.testing.allocator.create([10][10 * 10 * 10 * 10]u64);
defer std.testing.allocator.destroy(array);
array[1][1] = 0;
var a: u32 = 1;
var b: u32 = 1;
var i: u32 = 0;
while (i < 12345678) : (i += 1) {
array[a][b] += array[a][b] * i;
}
try std.testing.expect(array[a][b] == 0);
}Expected Behavior
test passes in <1s
(and does with stage 1)
Actual Behavior
test passes in > 20s (stage 2)
in debug and releasesafe modes.
seems to work fine in releasefast. (there's no memcpy in the llvmir)