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implement comptime bitcasting from array

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This commit is contained in:
Andrew Kelley 2017-08-25 20:05:10 -04:00
parent 4d8269f69f
commit db613d38f0
2 changed files with 11 additions and 2 deletions
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11
src/ir.cpp
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@ -14364,7 +14364,16 @@ static void buf_write_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
zig_unreachable(); zig_unreachable();
} }
case TypeTableEntryIdArray: case TypeTableEntryIdArray:
zig_panic("TODO buf_write_value_bytes array type"); {
size_t buf_i = 0;
expand_undef_array(codegen, val);
for (size_t elem_i = 0; elem_i < val->type->data.array.len; elem_i += 1) {
ConstExprValue *elem = &val->data.x_array.s_none.elements[elem_i];
buf_write_value_bytes(codegen, &buf[buf_i], elem);
buf_i += type_size(codegen, elem->type);
}
}
return;
case TypeTableEntryIdStruct: case TypeTableEntryIdStruct:
zig_panic("TODO buf_write_value_bytes struct type"); zig_panic("TODO buf_write_value_bytes struct type");
case TypeTableEntryIdMaybe: case TypeTableEntryIdMaybe:

2
test/cases/cast.zig
View File

@ -282,5 +282,5 @@ test "const slice widen cast" {
const u32_value = ([]const u32)(bytes[0..])[0]; const u32_value = ([]const u32)(bytes[0..])[0];
assert(u32_value == 0x12121212); assert(u32_value == 0x12121212);
//assert(@bitCast(u32, bytes) == 0x12121212); assert(@bitCast(u32, bytes) == 0x12121212);
} }