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8f3880074f
This change makes any of the `*_val` instructions check whether it's safe to elide copies for by-ref types rather than performing this elision blindly. AIR instructions fixed: - .array_elem_val - .struct_field_val - .unwrap_errunion_payload - .try - .optional_payload These now all respect value semantics, as expected. P.S. Thanks to Andrew for the new way to approach this. Many of the lines here are from his recommended change, which comes with the significant advantage that loads are now as small as the intervening memory access allows. Co-authored by: Andrew Kelley <andrew@ziglang.org>
18 lines
466 B
Zig
18 lines
466 B
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const expect = std.testing.expect;
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test {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
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if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
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var x: [10][10]u32 = undefined;
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x[0][1] = 0;
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const a = x[0];
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x[0][1] = 15;
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try expect(a[1] == 0);
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}
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