mirror of
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70 lines
2.1 KiB
Zig
70 lines
2.1 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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const expect = std.testing.expect;
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var base: usize = undefined;
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var result_off: [7]usize = undefined;
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var result_len: [7]usize = undefined;
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var result_index: usize = 0;
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noinline fn insertionSort(data: []u64) void {
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result_off[result_index] = @intFromPtr(data.ptr) - base;
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result_len[result_index] = data.len;
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result_index += 1;
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if (data.len > 1) {
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var least_i: usize = 0;
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var i: usize = 1;
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while (i < data.len) : (i += 1) {
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if (data[i] < data[least_i])
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least_i = i;
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}
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std.mem.swap(u64, &data[0], &data[least_i]);
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// there used to be a bug where
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// `data[1..]` is created on the stack
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// and pointed to by the first argument register
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// then stack is invalidated by the tailcall and
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// overwritten by callee
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// https://github.com/ziglang/zig/issues/9703
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return @call(.always_tail, insertionSort, .{data[1..]});
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}
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}
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test "arguments pointed to on stack into tailcall" {
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switch (builtin.cpu.arch) {
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.wasm32,
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.mips,
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.mipsel,
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.mips64,
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.mips64el,
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.powerpc,
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.powerpcle,
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.powerpc64,
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.powerpc64le,
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=> return error.SkipZigTest,
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else => {},
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}
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if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
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var data = [_]u64{ 1, 6, 2, 7, 1, 9, 3 };
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base = @intFromPtr(&data);
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insertionSort(data[0..]);
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try expect(result_len[0] == 7);
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try expect(result_len[1] == 6);
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try expect(result_len[2] == 5);
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try expect(result_len[3] == 4);
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try expect(result_len[4] == 3);
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try expect(result_len[5] == 2);
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try expect(result_len[6] == 1);
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try expect(result_off[0] == 0);
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try expect(result_off[1] == 8);
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try expect(result_off[2] == 16);
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try expect(result_off[3] == 24);
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try expect(result_off[4] == 32);
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try expect(result_off[5] == 40);
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try expect(result_off[6] == 48);
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}
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