Unify incremental test cases and disable many

The self-hosted aarch64 backend is not currently functional due to the
Liveness changes. A previous commit disabled aarch64 on the behavior
tests; this commit disables it and arm for the test cases. Moreover, all
incremental test cases have been unified into shared cross-platform
cases, which can be gradually enabled as the backends improve.

test/cases/aarch64-linux/conditional_branches.0.zig

@@ -1,26 +0,0 @@
-pub fn main() void {
-    foo(123);
-}
-
-fn foo(x: u64) void {
-    if (x > 42) {
-        print();
-    }
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (64),
-          [arg1] "{x0}" (1),
-          [arg2] "{x1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{x2}" ("Hello, World!\n".len),
-        : "memory", "cc"
-    );
-}
-
-// run
-// target=aarch64-linux
-//
-// Hello, World!
-//

test/cases/aarch64-linux/conditional_branches.1.zig

@@ -1,25 +0,0 @@
-pub fn main() void {
-    foo(true);
-}
-
-fn foo(x: bool) void {
-    if (x) {
-        print();
-    }
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (64),
-          [arg1] "{x0}" (1),
-          [arg2] "{x1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{x2}" ("Hello, World!\n".len),
-        : "memory", "cc"
-    );
-}
-
-// run
-//
-// Hello, World!
-//

test/cases/aarch64-linux/hello_world_with_updates.0.zig

@@ -1,31 +0,0 @@
-pub export fn _start() noreturn {
-    print();
-    exit(0);
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (64),
-          [arg1] "{x0}" (1),
-          [arg2] "{x1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{x2}" ("Hello, World!\n".len),
-        : "memory", "cc"
-    );
-}
-
-fn exit(ret: usize) noreturn {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (93),
-          [arg1] "{x0}" (ret),
-        : "memory", "cc"
-    );
-    unreachable;
-}
-
-// run
-// target=aarch64-linux
-//
-// Hello, World!
-//

test/cases/aarch64-linux/hello_world_with_updates.1.zig

@@ -1,36 +0,0 @@
-pub export fn _start() noreturn {
-    print();
-    print();
-    print();
-    print();
-    exit(0);
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (64),
-          [arg1] "{x0}" (1),
-          [arg2] "{x1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{x2}" ("Hello, World!\n".len),
-        : "memory", "cc"
-    );
-}
-
-fn exit(ret: usize) noreturn {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (93),
-          [arg1] "{x0}" (ret),
-        : "memory", "cc"
-    );
-    unreachable;
-}
-
-// run
-//
-// Hello, World!
-// Hello, World!
-// Hello, World!
-// Hello, World!
-//

test/cases/aarch64-linux/hello_world_with_updates.2.zig

@@ -1,21 +0,0 @@
-pub fn main() void {
-    print();
-    print();
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{x8}" (64),
-          [arg1] "{x0}" (1),
-          [arg2] "{x1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{x2}" ("Hello, World!\n".len),
-        : "memory", "cc"
-    );
-}
-
-// run
-//
-// Hello, World!
-// Hello, World!
-//

test/cases/aarch64-macos/hello_world_with_updates.4.zig

@@ -1,22 +0,0 @@
-extern "c" fn write(usize, usize, usize) usize;
-
-pub fn main() void {
-    print();
-    print();
-    print();
-    print();
-}
-
-fn print() void {
-    const msg = @ptrToInt("Hello, World!\n");
-    const len = 14;
-    _ = write(1, msg, len);
-}
-
-// run
-//
-// Hello, World!
-// Hello, World!
-// Hello, World!
-// Hello, World!
-//

test/cases/aarch64-macos/hello_world_with_updates.5.zig

@@ -1,16 +0,0 @@
-extern "c" fn write(usize, usize, usize) usize;
-
-pub fn main() void {
-    print();
-}
-
-fn print() void {
-    const msg = @ptrToInt("What is up? This is a longer message that will force the data to be relocated in virtual address space.\n");
-    const len = 104;
-    _ = write(1, msg, len);
-}
-
-// run
-//
-// What is up? This is a longer message that will force the data to be relocated in virtual address space.
-//

test/cases/aarch64-macos/hello_world_with_updates.6.zig

@@ -1,18 +0,0 @@
-extern "c" fn write(usize, usize, usize) usize;
-
-pub fn main() void {
-    print();
-    print();
-}
-
-fn print() void {
-    const msg = @ptrToInt("What is up? This is a longer message that will force the data to be relocated in virtual address space.\n");
-    const len = 104;
-    _ = write(1, msg, len);
-}
-
-// run
-//
-// What is up? This is a longer message that will force the data to be relocated in virtual address space.
-// What is up? This is a longer message that will force the data to be relocated in virtual address space.
-//

test/cases/arithmetic_operations.0.zig

@@ -0,0 +1,17 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(2, 4);
+    print(1, 7);
+}
+
+fn print(a: u32, b: u32) void {
+    const str = "123456789";
+    const len = a + b;
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+// target=x86_64-linux,x86_64-macos
+//
+// 12345612345678

test/cases/arithmetic_operations.1.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(10, 5);
+    print(4, 3);
+}
+
+fn print(a: u32, b: u32) void {
+    const str = "123456789";
+    const len = a - b;
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+//
+// 123451

test/cases/arithmetic_operations.2.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(8, 9);
+    print(3, 7);
+}
+
+fn print(a: u32, b: u32) void {
+    const str = "123456789";
+    const len = a & b;
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+//
+// 12345678123

test/cases/arithmetic_operations.3.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(4, 2);
+    print(3, 7);
+}
+
+fn print(a: u32, b: u32) void {
+    const str = "123456789";
+    const len = a | b;
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+//
+// 1234561234567

test/cases/arithmetic_operations.4.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(42, 42);
+    print(3, 5);
+}
+
+fn print(a: u32, b: u32) void {
+    const str = "123456789";
+    const len = a ^ b;
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+//
+// 123456

test/cases/arm-linux/arithmetic_operations.0.zig

@@ -1,21 +0,0 @@
-pub fn main() void {
-    print(2, 4);
-    print(1, 7);
-}
-
-fn print(a: u32, b: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (a + b),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("123456789")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-// target=arm-linux
-//
-// 12345612345678

test/cases/arm-linux/arithmetic_operations.1.zig

@@ -1,20 +0,0 @@
-pub fn main() void {
-    print(10, 5);
-    print(4, 3);
-}
-
-fn print(a: u32, b: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (a - b),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("123456789")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// 123451

test/cases/arm-linux/arithmetic_operations.2.zig

@@ -1,20 +0,0 @@
-pub fn main() void {
-    print(8, 9);
-    print(3, 7);
-}
-
-fn print(a: u32, b: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (a & b),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("123456789")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// 12345678123

test/cases/arm-linux/arithmetic_operations.3.zig

@@ -1,20 +0,0 @@
-pub fn main() void {
-    print(4, 2);
-    print(3, 7);
-}
-
-fn print(a: u32, b: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (a | b),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("123456789")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// 1234561234567

test/cases/arm-linux/arithmetic_operations.4.zig

@@ -1,20 +0,0 @@
-pub fn main() void {
-    print(42, 42);
-    print(3, 5);
-}
-
-fn print(a: u32, b: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (a ^ b),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("123456789")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// 123456

test/cases/arm-linux/errors.0.zig

@@ -1,21 +0,0 @@
-pub fn main() void {
-    foo() catch print();
-}
-
-fn foo() anyerror!void {}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{r2}" ("Hello, World!\n".len),
-        : "memory"
-    );
-    return;
-}
-
-// run
-// target=arm-linux
-//

test/cases/arm-linux/errors.1.zig

@@ -1,24 +0,0 @@
-pub fn main() void {
-    foo() catch print();
-}
-
-fn foo() anyerror!void {
-    return error.Test;
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{r2}" ("Hello, World!\n".len),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// Hello, World!
-//

test/cases/arm-linux/function_pointers.zig

@@ -1,44 +0,0 @@
-const PrintFn = *const fn () void;
-
-pub fn main() void {
-    var printFn: PrintFn = stopSayingThat;
-    var i: u32 = 0;
-    while (i < 4) : (i += 1) printFn();
-
-    printFn = moveEveryZig;
-    printFn();
-}
-
-fn stopSayingThat() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, my name is Inigo Montoya; you killed my father, prepare to die.\n")),
-          [arg3] "{r2}" ("Hello, my name is Inigo Montoya; you killed my father, prepare to die.\n".len),
-        : "memory"
-    );
-    return;
-}
-
-fn moveEveryZig() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("All your codebase are belong to us\n")),
-          [arg3] "{r2}" ("All your codebase are belong to us\n".len),
-        : "memory"
-    );
-    return;
-}
-
-// run
-// target=arm-linux
-//
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// All your codebase are belong to us
-//

test/cases/arm-linux/hello_world_with_updates.0.zig

@@ -1,32 +0,0 @@
-pub export fn _start() noreturn {
-    print();
-    exit();
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{r2}" (14),
-        : "memory"
-    );
-    return;
-}
-
-fn exit() noreturn {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (1),
-          [arg1] "{r0}" (0),
-        : "memory"
-    );
-    unreachable;
-}
-
-// run
-// target=arm-linux
-//
-// Hello, World!
-//

test/cases/arm-linux/hello_world_with_updates.1.zig

@@ -1,37 +0,0 @@
-pub export fn _start() noreturn {
-    print();
-    print();
-    print();
-    print();
-    exit();
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{r2}" (14),
-        : "memory"
-    );
-    return;
-}
-
-fn exit() noreturn {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (1),
-          [arg1] "{r0}" (0),
-        : "memory"
-    );
-    unreachable;
-}
-
-// run
-//
-// Hello, World!
-// Hello, World!
-// Hello, World!
-// Hello, World!
-//

test/cases/arm-linux/hello_world_with_updates.2.zig

@@ -1,22 +0,0 @@
-pub fn main() void {
-    print();
-    print();
-}
-
-fn print() void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-          [arg3] "{r2}" (14),
-        : "memory"
-    );
-    return;
-}
-
-// run
-//
-// Hello, World!
-// Hello, World!
-//

test/cases/arm-linux/parameters_and_return_values.0.zig

@@ -1,28 +0,0 @@
-pub fn main() void {
-    print(id(14));
-}
-
-fn id(x: u32) u32 {
-    return x;
-}
-
-// TODO: The parameters to the asm statement in print() had to
-// be in a specific order because otherwise the write to r0
-// would overwrite the len parameter which resides in r0
-fn print(len: u32) void {
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg3] "{r2}" (len),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("Hello, World!\n")),
-        : "memory"
-    );
-    return;
-}
-
-// run
-// target=arm-linux
-//
-// Hello, World!
-//

test/cases/arm-linux/print_u32s.zig

@@ -1,40 +0,0 @@
-pub fn main() void {
-    printNumberHex(0x00000000);
-    printNumberHex(0xaaaaaaaa);
-    printNumberHex(0xdeadbeef);
-    printNumberHex(0x31415926);
-}
-
-fn printNumberHex(x: u32) void {
-    var i: u5 = 28;
-    while (true) : (i -= 4) {
-        const digit = (x >> i) & 0xf;
-        asm volatile ("svc #0"
-            :
-            : [number] "{r7}" (4),
-              [arg1] "{r0}" (1),
-              [arg2] "{r1}" (@ptrToInt("0123456789abcdef") + digit),
-              [arg3] "{r2}" (1),
-            : "memory"
-        );
-
-        if (i == 0) break;
-    }
-    asm volatile ("svc #0"
-        :
-        : [number] "{r7}" (4),
-          [arg1] "{r0}" (1),
-          [arg2] "{r1}" (@ptrToInt("\n")),
-          [arg3] "{r2}" (1),
-        : "memory"
-    );
-}
-
-// run
-// target=arm-linux
-//
-// 00000000
-// aaaaaaaa
-// deadbeef
-// 31415926
-//

test/cases/assert_function.0.zig

@@ -11,5 +11,5 @@ pub fn assert(ok: bool) void {
 }
 
 // run
-// target=x86_64-linux
-//
+// target=x86_64-macos,x86_64-linux
+// link_libc=true

test/cases/assert_function.18.zig

@@ -0,0 +1,20 @@
+const builtin = @import("builtin");
+
+extern "c" fn write(c_int, usize, usize) usize;
+
+pub fn main() void {
+    for ("hello") |_| print();
+}
+
+fn print() void {
+    _ = write(1, @ptrToInt("hello\n"), 6);
+}
+
+// run
+//
+// hello
+// hello
+// hello
+// hello
+// hello
+//

test/cases/assert_function.7.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     var i: u32 = 0;

test/cases/assert_function.8.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     var i: u32 = 0;

test/cases/break_continue.0.zig

@@ -5,5 +5,5 @@ pub fn main() void {
 }
 
 // run
-// target=x86_64-linux,x86_64-macos,aarch64-linux,aarch64-macos
+// target=x86_64-linux,x86_64-macos
 //

test/cases/comptime_var.0.zig

@@ -6,7 +6,8 @@ pub fn main() void {
 
 // error
 // output_mode=Exe
-// target=x86_64-linux
+// target=x86_64-macos,x86_64-linux
+// link_libc=true
 //
 // :4:19: error: store to comptime variable depends on runtime condition
 // :4:11: note: runtime condition here

test/cases/comptime_var.2.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     comptime var len: u32 = 5;

test/cases/comptime_var.6.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     comptime var i: u64 = 2;

test/cases/conditional_branches.0.zig

@@ -0,0 +1,23 @@
+extern "c" fn write(c_int, usize, usize) usize;
+
+pub fn main() void {
+    foo(123);
+}
+
+fn foo(x: u64) void {
+    if (x > 42) {
+        print();
+    }
+}
+
+fn print() void {
+    const str = "Hello, World!\n";
+    _ = write(1, @ptrToInt(str.ptr), ptr.len);
+}
+
+// run
+// target=x86_64-linux,x86_64-macos
+// link_libc=true
+//
+// Hello, World!
+//

test/cases/conditional_branches.1.zig

@@ -0,0 +1,25 @@
+extern "c" fn write(c_int, usize, usize) usize;
+
+pub fn main() void {
+    foo(true);
+}
+
+fn foo(x: bool) void {
+    if (x) {
+        print();
+        print();
+    } else {
+        print();
+    }
+}
+
+fn print() void {
+    const str = "Hello, World!\n";
+    _ = write(1, @ptrToInt(str.ptr), ptr.len);
+}
+
+// run
+//
+// Hello, World!
+// Hello, World!
+//

test/cases/errors.0.zig

@@ -0,0 +1,15 @@
+const std = @import("std");
+
+pub fn main() void {
+    foo() catch print();
+}
+
+fn foo() anyerror!void {}
+
+fn print() void {
+    _ = std.os.write(1, "Hello, World!\n") catch {};
+}
+
+// run
+// target=x86_64-macos
+//

test/cases/errors.1.zig

@@ -0,0 +1,18 @@
+const std = @import("std");
+
+pub fn main() void {
+    foo() catch print();
+}
+
+fn foo() anyerror!void {
+    return error.Test;
+}
+
+fn print() void {
+    _ = std.os.write(1, "Hello, World!\n") catch {};
+}
+
+// run
+//
+// Hello, World!
+//

test/cases/exit.zig

@@ -0,0 +1,5 @@
+pub fn main() void {}
+
+// run
+// target=x86_64-linux,x86_64-macos,x86_64-windows,x86_64-plan9
+//

test/cases/function_pointers.zig

@@ -0,0 +1,30 @@
+const std = @import("std");
+
+const PrintFn = *const fn () void;
+
+pub fn main() void {
+    var printFn: PrintFn = stopSayingThat;
+    var i: u32 = 0;
+    while (i < 4) : (i += 1) printFn();
+
+    printFn = moveEveryZig;
+    printFn();
+}
+
+fn stopSayingThat() void {
+    _ = std.os.write(1, "Hello, my name is Inigo Montoya; you killed my father, prepare to die.\n") catch {};
+}
+
+fn moveEveryZig() void {
+    _ = std.os.write(1, "All your codebase are belong to us\n") catch {};
+}
+
+// run
+// target=x86_64-macos
+//
+// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
+// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
+// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
+// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
+// All your codebase are belong to us
+//

test/cases/hello_world_with_updates.0.zig

@@ -1,5 +1,6 @@
 // error
 // output_mode=Exe
-// target=aarch64-macos
+// target=x86_64-linux,x86_64-macos
+// link_libc=true
 //
 // :?:?: error: root struct of file 'tmp' has no member named 'main'

test/cases/hello_world_with_updates.2.zig

@@ -1,5 +1,5 @@
-extern "c" fn write(usize, usize, usize) usize;
-extern "c" fn exit(usize) noreturn;
+extern "c" fn write(c_int, usize, usize) usize;
+extern "c" fn exit(c_int) noreturn;
 
 pub export fn main() noreturn {
     print();

test/cases/hello_world_with_updates.3.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     print();

test/cases/hello_world_with_updates.4.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     print();

test/cases/hello_world_with_updates.5.zig

@@ -1,4 +1,4 @@
-extern "c" fn write(usize, usize, usize) usize;
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     print();

test/cases/hello_world_with_updates.6.zig

@@ -1,4 +1,6 @@
-extern "c" fn write(usize, usize, usize) usize;
+const builtin = @import("builtin");
+
+extern "c" fn write(c_int, usize, usize) usize;
 
 pub fn main() void {
     print();

test/cases/large_add_function.zig

@@ -33,6 +33,8 @@ fn assert(ok: bool) void {
     if (!ok) unreachable;
 }
 
+// TODO: enable this for native backend
+
 // run
+// backend=llvm
 // target=aarch64-linux,aarch64-macos
-//

test/cases/only_1_function_and_it_gets_updated.0.zig

@@ -0,0 +1,7 @@
+pub export fn _start() noreturn {
+    while (true) {}
+}
+
+// run
+// target=x86_64-linux,x86_64-macos
+//

test/cases/only_1_function_and_it_gets_updated.1.zig

@@ -0,0 +1,8 @@
+pub export fn _start() noreturn {
+    var dummy: u32 = 10;
+    _ = dummy;
+    while (true) {}
+}
+
+// run
+//

test/cases/parameters_and_return_values.0.zig

@@ -0,0 +1,20 @@
+const std = @import("std");
+
+pub fn main() void {
+    print(id(14));
+}
+
+fn id(x: u32) u32 {
+    return x;
+}
+
+fn print(len: u32) void {
+    const str = "Hello, World!\n";
+    _ = std.os.write(1, str[0..len]) catch {};
+}
+
+// run
+// target=x86_64-macos
+//
+// Hello, World!
+//

test/cases/plan9/exit.zig

@@ -1,5 +0,0 @@
-pub fn main() void {}
-
-// run
-// target=x86_64-plan9
-//

test/cases/plan9/hello_world_with_updates.0.zig

@@ -1,28 +0,0 @@
-pub fn main() void {
-    const str = "Hello World!\n";
-    asm volatile (
-        \\push $0
-        \\push %%r10
-        \\push %%r11
-        \\push $1
-        \\push $0
-        \\syscall
-        \\pop %%r11
-        \\pop %%r11
-        \\pop %%r11
-        \\pop %%r11
-        \\pop %%r11
-        :
-        // pwrite
-        : [syscall_number] "{rbp}" (51),
-          [hey] "{r11}" (@ptrToInt(str)),
-          [strlen] "{r10}" (str.len),
-        : "rcx", "rbp", "r11", "memory"
-    );
-}
-
-// run
-// target=x86_64-plan9
-//
-// Hello World
-//

test/cases/plan9/hello_world_with_updates.1.zig

@@ -1,11 +0,0 @@
-const std = @import("std");
-pub fn main() void {
-    const str = "Hello World!\n";
-    _ = std.os.plan9.pwrite(1, str, str.len, 0);
-}
-
-// run
-// target=x86_64-plan9
-//
-// Hello World
-//

test/cases/print_u32s.zig

@@ -0,0 +1,28 @@
+const std = @import("std");
+
+pub fn main() void {
+    printNumberHex(0x00000000);
+    printNumberHex(0xaaaaaaaa);
+    printNumberHex(0xdeadbeef);
+    printNumberHex(0x31415926);
+}
+
+fn printNumberHex(x: u32) void {
+    const digit_chars = "0123456789abcdef";
+    var i: u5 = 28;
+    while (true) : (i -= 4) {
+        const digit = (x >> i) & 0xf;
+        _ = std.os.write(1, &.{digit_chars[digit]}) catch {};
+        if (i == 0) break;
+    }
+    _ = std.os.write(1, "\n") catch {};
+}
+
+// run
+// target=x86_64-macos
+//
+// 00000000
+// aaaaaaaa
+// deadbeef
+// 31415926
+//