01c1f41520
* Fix backend using wrong union field of the slice instruction. * LLVM backend properly sets alignment on global variables. * Sema: add coercion for *T to *[1]T * Sema: pointers to Decls with explicit alignment now have alignment metadata in them.
44 lines
1.3 KiB
Zig
44 lines
1.3 KiB
Zig
const std = @import("std");
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const expect = std.testing.expect;
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const builtin = @import("builtin");
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const native_arch = builtin.target.cpu.arch;
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var foo: u8 align(4) = 100;
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test "global variable alignment" {
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comptime try expect(@typeInfo(@TypeOf(&foo)).Pointer.alignment == 4);
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comptime try expect(@TypeOf(&foo) == *align(4) u8);
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{
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const slice = @as(*[1]u8, &foo)[0..];
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comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
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}
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{
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var runtime_zero: usize = 0;
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const slice = @as(*[1]u8, &foo)[runtime_zero..];
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comptime try expect(@TypeOf(slice) == []align(4) u8);
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}
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}
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test "default alignment allows unspecified in type syntax" {
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try expect(*u32 == *align(@alignOf(u32)) u32);
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}
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test "implicitly decreasing pointer alignment" {
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const a: u32 align(4) = 3;
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const b: u32 align(8) = 4;
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try expect(addUnaligned(&a, &b) == 7);
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}
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fn addUnaligned(a: *align(1) const u32, b: *align(1) const u32) u32 {
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return a.* + b.*;
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}
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test "implicitly decreasing slice alignment" {
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const a: u32 align(4) = 3;
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const b: u32 align(8) = 4;
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try expect(addUnalignedSlice(@as(*const [1]u32, &a)[0..], @as(*const [1]u32, &b)[0..]) == 7);
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}
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fn addUnalignedSlice(a: []align(1) const u32, b: []align(1) const u32) u32 {
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return a[0] + b[0];
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}
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