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zig/test/cases/bswap.zig

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breaking API changes to all readInt/writeInt functions & more * add `@bswap` builtin function. See #767 * comptime evaluation facilities are improved to be able to handle a `@ptrCast` with a backing array. * `@truncate` allows "truncating" a u0 value to any integer type, and the result is always comptime known to be `0`. * when specifying pointer alignment in a type expression, the alignment value of pointers which do not have addresses at runtime is ignored, and always has the default/ABI alignment * threw in a fix to freebsd/x86_64.zig to update syntax from language changes * some improvements are pending #863 closes #638 closes #1733 std lib API changes * io.InStream().readIntNe renamed to readIntNative * io.InStream().readIntLe renamed to readIntLittle * io.InStream().readIntBe renamed to readIntBig * introduced io.InStream().readIntForeign * io.InStream().readInt has parameter order changed * io.InStream().readVarInt has parameter order changed * io.InStream().writeIntNe renamed to writeIntNative * introduced io.InStream().writeIntForeign * io.InStream().writeIntLe renamed to writeIntLittle * io.InStream().writeIntBe renamed to writeIntBig * io.InStream().writeInt has parameter order changed * mem.readInt has different parameters and semantics * introduced mem.readIntNative * introduced mem.readIntForeign * mem.readIntBE renamed to mem.readIntBig and different API * mem.readIntLE renamed to mem.readIntLittle and different API * introduced mem.readIntSliceNative * introduced mem.readIntSliceForeign * introduced mem.readIntSliceLittle * introduced mem.readIntSliceBig * introduced mem.readIntSlice * mem.writeInt has different parameters and semantics * introduced mem.writeIntNative * introduced mem.writeIntForeign * mem.writeIntBE renamed to mem.readIntBig and different semantics * mem.writeIntLE renamed to mem.readIntLittle and different semantics * introduced mem.writeIntSliceForeign * introduced mem.writeIntSliceNative * introduced mem.writeIntSliceBig * introduced mem.writeIntSliceLittle * introduced mem.writeIntSlice * removed mem.endianSwapIfLe * removed mem.endianSwapIfBe * removed mem.endianSwapIf * added mem.littleToNative * added mem.bigToNative * added mem.toNative * added mem.nativeTo * added mem.nativeToLittle * added mem.nativeToBig
2018-12-12 17:19:46 -08:00
const std = @import("std");
const assert = std.debug.assert;
test "@bswap" {
comptime testByteSwap();
testByteSwap();
}
fn testByteSwap() void {
assert(@bswap(u0, 0) == 0);
assert(@bswap(u8, 0x12) == 0x12);
assert(@bswap(u16, 0x1234) == 0x3412);
assert(@bswap(u24, 0x123456) == 0x563412);
assert(@bswap(u32, 0x12345678) == 0x78563412);
assert(@bswap(u40, 0x123456789a) == 0x9a78563412);
assert(@bswap(u48, 0x123456789abc) == 0xbc9a78563412);
assert(@bswap(u56, 0x123456789abcde) == 0xdebc9a78563412);
assert(@bswap(u64, 0x123456789abcdef1) == 0xf1debc9a78563412);
assert(@bswap(u128, 0x123456789abcdef11121314151617181) == 0x8171615141312111f1debc9a78563412);
assert(@bswap(i0, 0) == 0);
assert(@bswap(i8, -50) == -50);
assert(@bswap(i16, @bitCast(i16, u16(0x1234))) == @bitCast(i16, u16(0x3412)));
assert(@bswap(i24, @bitCast(i24, u24(0x123456))) == @bitCast(i24, u24(0x563412)));
assert(@bswap(i32, @bitCast(i32, u32(0x12345678))) == @bitCast(i32, u32(0x78563412)));
assert(@bswap(i40, @bitCast(i40, u40(0x123456789a))) == @bitCast(i40, u40(0x9a78563412)));
assert(@bswap(i48, @bitCast(i48, u48(0x123456789abc))) == @bitCast(i48, u48(0xbc9a78563412)));
assert(@bswap(i56, @bitCast(i56, u56(0x123456789abcde))) == @bitCast(i56, u56(0xdebc9a78563412)));
assert(@bswap(i64, @bitCast(i64, u64(0x123456789abcdef1))) == @bitCast(i64, u64(0xf1debc9a78563412)));
assert(@bswap(i128, @bitCast(i128, u128(0x123456789abcdef11121314151617181))) ==
@bitCast(i128, u128(0x8171615141312111f1debc9a78563412)));
}