Merge pull request #14853 from schmee/vector-peer-type-resolution

Vector type resolution/coercion fixes

src/Sema.zig

@@ -2599,6 +2599,20 @@ fn coerceResultPtr(
         const trash_inst = trash_block.instructions.pop();
 
         switch (air_tags[trash_inst]) {
+            // Array coerced to Vector where element size is not equal but coercible.
+            .aggregate_init => {
+                const ty_pl = air_datas[trash_inst].ty_pl;
+                const ptr_operand_ty = try Type.ptr(sema.arena, sema.mod, .{
+                    .pointee_type = try sema.analyzeAsType(block, src, ty_pl.ty),
+                    .@"addrspace" = addr_space,
+                });
+
+                if (try sema.resolveDefinedValue(block, src, new_ptr)) |ptr_val| {
+                    return sema.addConstant(ptr_operand_ty, ptr_val);
+                } else {
+                    return sema.bitCast(block, ptr_operand_ty, new_ptr, src, null);
+                }
+            },
             .bitcast => {
                 const ty_op = air_datas[trash_inst].ty_op;
                 const operand_ty = sema.typeOf(ty_op.operand);
@@ -30068,6 +30082,31 @@ fn resolvePeerTypes(
                 continue;
             },
             .Vector => switch (chosen_ty_tag) {
+                .Vector => {
+                    const chosen_len = chosen_ty.vectorLen();
+                    const candidate_len = candidate_ty.vectorLen();
+                    if (chosen_len != candidate_len)
+                        continue;
+
+                    const chosen_child_ty = chosen_ty.childType();
+                    const candidate_child_ty = candidate_ty.childType();
+                    if (chosen_child_ty.zigTypeTag() == .Int and candidate_child_ty.zigTypeTag() == .Int) {
+                        const chosen_info = chosen_child_ty.intInfo(target);
+                        const candidate_info = candidate_child_ty.intInfo(target);
+                        if (chosen_info.bits < candidate_info.bits) {
+                            chosen = candidate;
+                            chosen_i = candidate_i + 1;
+                        }
+                        continue;
+                    }
+                    if (chosen_child_ty.zigTypeTag() == .Float and candidate_child_ty.zigTypeTag() == .Float) {
+                        if (chosen_ty.floatBits(target) < candidate_ty.floatBits(target)) {
+                            chosen = candidate;
+                            chosen_i = candidate_i + 1;
+                        }
+                        continue;
+                    }
+                },
                 .Array => {
                     chosen = candidate;
                     chosen_i = candidate_i + 1;

test/behavior/vector.zig

@@ -175,6 +175,44 @@ test "array to vector" {
     comptime try S.doTheTest();
 }
 
+test "array to vector with element type coercion" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var foo: f16 = 3.14;
+            var arr32 = [4]f32{ foo, 1.5, 0.0, 0.0 };
+            var vec: @Vector(4, f32) = [4]f16{ foo, 1.5, 0.0, 0.0 };
+            try std.testing.expect(std.mem.eql(f32, &@as([4]f32, vec), &arr32));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "peer type resolution with coercible element types" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var b: @Vector(2, u8) = .{ 1, 2 };
+            var a: @Vector(2, u16) = .{ 2, 1 };
+            var t: bool = true;
+            var c = if (t) a else b;
+            try std.testing.expect(@TypeOf(c) == @Vector(2, u16));
+        }
+    };
+    comptime try S.doTheTest();
+}
+
 test "tuple to vector" {
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO