introduce align keyword

 * remove `@setGlobalAlign`
 * add align keyword for setting alignment on functions and
   variables.
 * loads and stores use alignment from pointer
 * memcpy, memset use alignment from pointer
 * add syntax for pointer alignment
 * slices can have volatile
 * add u2, i2 primitives
 * ignore preferred align and use abi align everywhere
 * back to only having alignOf builtin.
   preferredAlignOf is too tricky to be useful.
   See #432. Partial revert of
   e726925e802eddab53cbfd9aacbc5eefe95c356f.

See #37

1 files changed, 9 insertions, 28 deletions

diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index e2f4489b0f..ac5e06d9f3 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -1316,13 +1316,15 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\}
     , ".tmp_source.zig:2:24: error: integer value 753664 cannot be implicitly casted to type 'u16'");
 
-    cases.add("set global variable alignment to non power of 2",
-        \\const some_data: [100]u8 = undefined;
-        \\comptime {
-        \\    @setGlobalAlign(some_data, 3);
-        \\}
+    cases.add("global variable alignment non power of 2",
+        \\const some_data: [100]u8 align 3 = undefined;
         \\export fn entry() -> usize { @sizeOf(@typeOf(some_data)) }
-    , ".tmp_source.zig:3:32: error: alignment value must be power of 2");
+    , ".tmp_source.zig:1:32: error: alignment value 3 is not a power of 2");
+
+    cases.add("function alignment non power of 2",
+        \\extern fn foo() align 3;
+        \\export fn entry() { foo() }
+    , ".tmp_source.zig:1:23: error: alignment value 3 is not a power of 2");
 
     cases.add("compile log",
         \\export fn foo() {
@@ -1342,9 +1344,6 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         ".tmp_source.zig:2:17: note: called from here");
 
     cases.add("casting bit offset pointer to regular pointer",
-        \\const u2 = @IntType(false, 2);
-        \\const u3 = @IntType(false, 3);
-        \\
         \\const BitField = packed struct {
         \\    a: u3,
         \\    b: u3,
@@ -1360,7 +1359,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\}
         \\
         \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
-    , ".tmp_source.zig:11:26: error: expected type '&const u3', found '&:3:6 const u3'");
+    , ".tmp_source.zig:8:26: error: expected type '&const u3', found '&align 1:3:6 const u3'");
 
     cases.add("referring to a struct that is invalid",
         \\const UsbDeviceRequest = struct {
@@ -1626,24 +1625,6 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         "error: 'main' is private",
         ".tmp_source.zig:1:1: note: declared here");
 
-    cases.add("@setGlobalAlign extern variable",
-        \\extern var foo: i32;
-        \\comptime {
-        \\    @setGlobalAlign(foo, 4);
-        \\}
-    ,
-        ".tmp_source.zig:3:5: error: cannot set alignment of external variable 'foo'",
-        ".tmp_source.zig:1:8: note: declared here");
-
-    cases.add("@setGlobalAlign extern fn",
-        \\extern fn foo();
-        \\comptime {
-        \\    @setGlobalAlign(foo, 4);
-        \\}
-    ,
-        ".tmp_source.zig:3:5: error: cannot set alignment of external function 'foo'",
-        ".tmp_source.zig:1:8: note: declared here");
-
     cases.add("@setGlobalSection extern variable",
         \\extern var foo: i32;
         \\comptime {