diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 5cb9c6589ccb..f090e1e8e4ca 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -433,6 +433,14 @@ pub fn eql(a: var, b: @TypeOf(a)) bool {
                 if (!eql(e, b[i])) return false;
             return true;
         },
+        builtin.TypeId.Vector => {
+            const info = @typeInfo(T).Vector;
+            var i: usize = 0;
+            while (i < info.len) : (i += 1) {
+                if (!eql(a[i], b[i])) return false;
+            }
+            return true;
+        },
         builtin.TypeId.Pointer => {
             const info = @typeInfo(T).Pointer;
             switch (info.size) {
@@ -510,6 +518,13 @@ test "std.meta.eql" {
     testing.expect(eql(EU.tst(true), EU.tst(true)));
     testing.expect(eql(EU.tst(false), EU.tst(false)));
     testing.expect(!eql(EU.tst(false), EU.tst(true)));
+
+    var v1 = @splat(4, @as(u32, 1));
+    var v2 = @splat(4, @as(u32, 1));
+    var v3 = @splat(4, @as(u32, 2));
+
+    testing.expect(eql(v1, v2));
+    testing.expect(!eql(v1, v3));
 }
 
 test "intToEnum with error return" {
diff --git a/lib/std/os/test.zig b/lib/std/os/test.zig
index f33b5d5261ef..989653116c57 100644
--- a/lib/std/os/test.zig
+++ b/lib/std/os/test.zig
@@ -276,8 +276,11 @@ test "mmap" {
         testing.expectEqual(@as(usize, 1234), data.len);
 
         // By definition the data returned by mmap is zero-filled
-        std.mem.set(u8, data[0 .. data.len - 1], 0x55);
-        testing.expect(mem.indexOfScalar(u8, data, 0).? == 1234 - 1);
+        testing.expect(mem.eql(u8, data, &[_]u8{0x00} ** 1234));
+
+        // Make sure the memory is writeable as requested
+        std.mem.set(u8, data, 0x55);
+        testing.expect(mem.eql(u8, data, &[_]u8{0x55} ** 1234));
     }
 
     const test_out_file = "os_tmp_test";
@@ -300,10 +303,7 @@ test "mmap" {
 
     // Map the whole file
     {
-        const file = try fs.cwd().createFile(test_out_file, .{
-            .read = true,
-            .truncate = false,
-        });
+        const file = try fs.cwd().openFile(test_out_file, .{});
         defer file.close();
 
         const data = try os.mmap(
@@ -327,15 +327,12 @@ test "mmap" {
 
     // Map the upper half of the file
     {
-        const file = try fs.cwd().createFile(test_out_file, .{
-            .read = true,
-            .truncate = false,
-        });
+        const file = try fs.cwd().openFile(test_out_file, .{});
         defer file.close();
 
         const data = try os.mmap(
             null,
-            alloc_size,
+            alloc_size / 2,
             os.PROT_READ,
             os.MAP_PRIVATE,
             file.handle,
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index f8247b5a9de1..8a4491d1d7a2 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -56,7 +56,6 @@ pub fn expectEqual(expected: var, actual: @TypeOf(expected)) void {
         .EnumLiteral,
         .Enum,
         .Fn,
-        .Vector,
         .ErrorSet,
         => {
             if (actual != expected) {
@@ -88,6 +87,15 @@ pub fn expectEqual(expected: var, actual: @TypeOf(expected)) void {
 
         .Array => |array| expectEqualSlices(array.child, &expected, &actual),
 
+        .Vector => |vectorType| {
+            var i: usize = 0;
+            while (i < vectorType.len) : (i += 1) {
+                if (!std.meta.eql(expected[i], actual[i])) {
+                    std.debug.panic("index {} incorrect. expected {}, found {}", .{ i, expected[i], actual[i] });
+                }
+            }
+        },
+
         .Struct => |structType| {
             inline for (structType.fields) |field| {
                 expectEqual(@field(expected, field.name), @field(actual, field.name));
@@ -202,3 +210,10 @@ test "expectEqual nested array" {
 
     expectEqual(a, b);
 }
+
+test "expectEqual vector" {
+    var a = @splat(4, @as(u32, 4));
+    var b = @splat(4, @as(u32, 4));
+
+    expectEqual(a, b);
+}
diff --git a/src/analyze.cpp b/src/analyze.cpp
index c8b63f4535b2..fc1a805d825c 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -6937,9 +6937,9 @@ static void render_const_val_array(CodeGen *g, Buf *buf, Buf *type_name, ZigValu
             return;
         }
         case ConstArraySpecialNone: {
-            ZigValue *base = &array->data.s_none.elements[start];
-            assert(base != nullptr);
             assert(start + len <= const_val->type->data.array.len);
+            ZigValue *base = &array->data.s_none.elements[start];
+            assert(len == 0 || base != nullptr);
 
             buf_appendf(buf, "%s{", buf_ptr(type_name));
             for (uint64_t i = 0; i < len; i += 1) {
diff --git a/src/ir.cpp b/src/ir.cpp
index 3fc2ddadebd0..570fdd0b05d9 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -14840,6 +14840,16 @@ static IrInstGen *ir_analyze_cast(IrAnalyze *ira, IrInst *source_instr,
         }
     }
 
+    // @Vector(N,T1) to @Vector(N,T2)
+    if (actual_type->id == ZigTypeIdVector && wanted_type->id == ZigTypeIdVector) {
+        if (actual_type->data.vector.len == wanted_type->data.vector.len &&
+            types_match_const_cast_only(ira, wanted_type->data.vector.elem_type,
+                actual_type->data.vector.elem_type, source_node, false).id == ConstCastResultIdOk)
+        {
+            return ir_analyze_bit_cast(ira, source_instr, value, wanted_type);
+        }
+    }
+
     // *@Frame(func) to anyframe->T or anyframe
     // *@Frame(func) to ?anyframe->T or ?anyframe
     // *@Frame(func) to E!anyframe->T or E!anyframe
@@ -16409,9 +16419,11 @@ static IrInstGen *ir_analyze_bin_op_cmp(IrAnalyze *ira, IrInstSrcBinOp *bin_op_i
         case ZigTypeIdComptimeInt:
         case ZigTypeIdInt:
         case ZigTypeIdFloat:
-        case ZigTypeIdVector:
             zig_unreachable(); // handled with the type_is_numeric checks above
 
+        case ZigTypeIdVector:
+            // Not every case is handled by the type_is_numeric checks above,
+            // vectors of bool trigger this code path
         case ZigTypeIdBool:
         case ZigTypeIdMetaType:
         case ZigTypeIdVoid:
diff --git a/src/link.cpp b/src/link.cpp
index d5722ac2f6ab..2771b694c1fb 100644
--- a/src/link.cpp
+++ b/src/link.cpp
@@ -2642,13 +2642,6 @@ void codegen_link(CodeGen *g) {
     lj.rpath_table.init(4);
     lj.codegen = g;
 
-    if (g->verbose_llvm_ir) {
-        fprintf(stderr, "\nOptimization:\n");
-        fprintf(stderr, "---------------\n");
-        fflush(stderr);
-        LLVMDumpModule(g->module);
-    }
-
     if (g->out_type == OutTypeObj) {
         lj.args.append("-r");
     }
diff --git a/test/stage1/behavior/vector.zig b/test/stage1/behavior/vector.zig
index 338f24d8062b..e89399c5e257 100644
--- a/test/stage1/behavior/vector.zig
+++ b/test/stage1/behavior/vector.zig
@@ -1,6 +1,7 @@
 const std = @import("std");
 const mem = std.mem;
 const expect = std.testing.expect;
+const expectEqual = std.testing.expectEqual;
 const builtin = @import("builtin");
 
 test "implicit cast vector to array - bool" {
@@ -250,3 +251,29 @@ test "initialize vector which is a struct field" {
     S.doTheTest();
     comptime S.doTheTest();
 }
+
+test "vector comparison operators" {
+    const S = struct {
+        fn doTheTest() void {
+            {
+                const v1: @Vector(4, bool) = [_]bool{ true, false, true, false };
+                const v2: @Vector(4, bool) = [_]bool{ false, true, false, true };
+                expectEqual(@splat(4, true), v1 == v1);
+                expectEqual(@splat(4, false), v1 == v2);
+                expectEqual(@splat(4, true), v1 != v2);
+                expectEqual(@splat(4, false), v2 != v2);
+            }
+            {
+                const v1 = @splat(4, @as(u32, 0xc0ffeeee));
+                const v2: @Vector(4, c_uint) = v1;
+                const v3 = @splat(4, @as(u32, 0xdeadbeef));
+                expectEqual(@splat(4, true), v1 == v2);
+                expectEqual(@splat(4, false), v1 == v3);
+                expectEqual(@splat(4, true), v1 != v3);
+                expectEqual(@splat(4, false), v1 != v2);
+            }
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}