remove @canImplicitCast builtin

nobody will miss it

Author: andrewrk

doc/langref.html.in

@@ -3845,9 +3845,6 @@ pub fn printValue(self: *OutStream, value: var) !void {
         return self.printInt(T, value);
     } else if (@isFloat(T)) {
         return self.printFloat(T, value);
-    } else if (@canImplicitCast([]const u8, value)) {
-        const casted_value = ([]const u8)(value);
-        return self.write(casted_value);
     } else {
         @compileError("Unable to print type '" ++ @typeName(T) ++ "'");
     }
@@ -4102,12 +4099,6 @@ comptime {
       </p>
       {#see_also|Import from C Header File|@cImport|@cDefine|@cInclude#}
       {#header_close#}
-      {#header_open|@canImplicitCast#}
-      <pre><code class="zig">@canImplicitCast(comptime T: type, value) bool</code></pre>
-      <p>
-      Returns whether a value can be implicitly casted to a given type.
-      </p>
-      {#header_close#}
       {#header_open|@clz#}
       <pre><code class="zig">@clz(x: T) U</code></pre>
       <p>
@@ -6136,7 +6127,7 @@ hljs.registerLanguage("zig", function(t) {
         a = t.IR + "\\s*\\(",
         c = {
             keyword: "const align var extern stdcallcc nakedcc volatile export pub noalias inline struct packed enum union break return try catch test continue unreachable comptime and or asm defer errdefer if else switch while for fn use bool f32 f64 void type noreturn error i8 u8 i16 u16 i32 u32 i64 u64 isize usize i8w u8w i16w i32w u32w i64w u64w isizew usizew c_short c_ushort c_int c_uint c_long c_ulong c_longlong c_ulonglong",
-            built_in: "atomicLoad breakpoint returnAddress frameAddress fieldParentPtr setFloatMode IntType OpaqueType compileError compileLog setCold setRuntimeSafety setEvalBranchQuota offsetOf memcpy inlineCall setGlobalLinkage setGlobalSection divTrunc divFloor enumTagName intToPtr ptrToInt panic canImplicitCast ptrCast bitCast rem mod memset sizeOf alignOf alignCast maxValue minValue memberCount memberName memberType typeOf addWithOverflow subWithOverflow mulWithOverflow shlWithOverflow shlExact shrExact cInclude cDefine cUndef ctz clz import cImport errorName embedFile cmpxchgStrong cmpxchgWeak fence divExact truncate atomicRmw sqrt field typeInfo typeName newStackCall",
+            built_in: "atomicLoad breakpoint returnAddress frameAddress fieldParentPtr setFloatMode IntType OpaqueType compileError compileLog setCold setRuntimeSafety setEvalBranchQuota offsetOf memcpy inlineCall setGlobalLinkage setGlobalSection divTrunc divFloor enumTagName intToPtr ptrToInt panic ptrCast bitCast rem mod memset sizeOf alignOf alignCast maxValue minValue memberCount memberName memberType typeOf addWithOverflow subWithOverflow mulWithOverflow shlWithOverflow shlExact shrExact cInclude cDefine cUndef ctz clz import cImport errorName embedFile cmpxchgStrong cmpxchgWeak fence divExact truncate atomicRmw sqrt field typeInfo typeName newStackCall",
             literal: "true false null undefined"
         },
         n = [e, t.CLCM, t.CBCM, s, r];

src/all_types.hpp

@@ -1354,7 +1354,6 @@ enum BuiltinFnId {
     BuiltinFnIdSetRuntimeSafety,
     BuiltinFnIdSetFloatMode,
     BuiltinFnIdTypeName,
-    BuiltinFnIdCanImplicitCast,
     BuiltinFnIdPanic,
     BuiltinFnIdPtrCast,
     BuiltinFnIdBitCast,
@@ -2065,7 +2064,6 @@ enum IrInstructionId {
     IrInstructionIdCheckSwitchProngs,
     IrInstructionIdCheckStatementIsVoid,
     IrInstructionIdTypeName,
-    IrInstructionIdCanImplicitCast,
     IrInstructionIdDeclRef,
     IrInstructionIdPanic,
     IrInstructionIdTagName,
@@ -2858,13 +2856,6 @@ struct IrInstructionTypeName {
     IrInstruction *type_value;
 };
 
-struct IrInstructionCanImplicitCast {
-    IrInstruction base;
-
-    IrInstruction *type_value;
-    IrInstruction *target_value;
-};
-
 struct IrInstructionDeclRef {
     IrInstruction base;
 

src/codegen.cpp

@@ -4625,7 +4625,6 @@ static LLVMValueRef ir_render_instruction(CodeGen *g, IrExecutable *executable,
         case IrInstructionIdCheckSwitchProngs:
         case IrInstructionIdCheckStatementIsVoid:
         case IrInstructionIdTypeName:
-        case IrInstructionIdCanImplicitCast:
         case IrInstructionIdDeclRef:
         case IrInstructionIdSwitchVar:
         case IrInstructionIdOffsetOf:
@@ -6277,7 +6276,6 @@ static void define_builtin_fns(CodeGen *g) {
     create_builtin_fn(g, BuiltinFnIdCImport, "cImport", 1);
     create_builtin_fn(g, BuiltinFnIdErrName, "errorName", 1);
     create_builtin_fn(g, BuiltinFnIdTypeName, "typeName", 1);
-    create_builtin_fn(g, BuiltinFnIdCanImplicitCast, "canImplicitCast", 2);
     create_builtin_fn(g, BuiltinFnIdEmbedFile, "embedFile", 1);
     create_builtin_fn(g, BuiltinFnIdCmpxchgWeak, "cmpxchgWeak", 6);
     create_builtin_fn(g, BuiltinFnIdCmpxchgStrong, "cmpxchgStrong", 6);

src/ir.cpp

@@ -585,10 +585,6 @@ static constexpr IrInstructionId ir_instruction_id(IrInstructionTypeName *) {
     return IrInstructionIdTypeName;
 }
 
-static constexpr IrInstructionId ir_instruction_id(IrInstructionCanImplicitCast *) {
-    return IrInstructionIdCanImplicitCast;
-}
-
 static constexpr IrInstructionId ir_instruction_id(IrInstructionDeclRef *) {
     return IrInstructionIdDeclRef;
 }
@@ -2348,20 +2344,6 @@ static IrInstruction *ir_build_type_name(IrBuilder *irb, Scope *scope, AstNode *
     return &instruction->base;
 }
 
-static IrInstruction *ir_build_can_implicit_cast(IrBuilder *irb, Scope *scope, AstNode *source_node,
-        IrInstruction *type_value, IrInstruction *target_value)
-{
-    IrInstructionCanImplicitCast *instruction = ir_build_instruction<IrInstructionCanImplicitCast>(
-            irb, scope, source_node);
-    instruction->type_value = type_value;
-    instruction->target_value = target_value;
-
-    ir_ref_instruction(type_value, irb->current_basic_block);
-    ir_ref_instruction(target_value, irb->current_basic_block);
-
-    return &instruction->base;
-}
-
 static IrInstruction *ir_build_decl_ref(IrBuilder *irb, Scope *scope, AstNode *source_node,
         Tld *tld, LVal lval)
 {
@@ -4132,21 +4114,6 @@ static IrInstruction *ir_gen_builtin_fn_call(IrBuilder *irb, Scope *scope, AstNo
                 IrInstruction *type_name = ir_build_type_name(irb, scope, node, arg0_value);
                 return ir_lval_wrap(irb, scope, type_name, lval);
             }
-        case BuiltinFnIdCanImplicitCast:
-            {
-                AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
-                IrInstruction *arg0_value = ir_gen_node(irb, arg0_node, scope);
-                if (arg0_value == irb->codegen->invalid_instruction)
-                    return arg0_value;
-
-                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
-                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
-                if (arg1_value == irb->codegen->invalid_instruction)
-                    return arg1_value;
-
-                IrInstruction *can_implicit_cast = ir_build_can_implicit_cast(irb, scope, node, arg0_value, arg1_value);
-                return ir_lval_wrap(irb, scope, can_implicit_cast, lval);
-            }
         case BuiltinFnIdPanic:
             {
                 AstNode *arg0_node = node->data.fn_call_expr.params.at(0);
@@ -18405,30 +18372,6 @@ static TypeTableEntry *ir_analyze_instruction_check_statement_is_void(IrAnalyze
     return ira->codegen->builtin_types.entry_void;
 }
 
-static TypeTableEntry *ir_analyze_instruction_can_implicit_cast(IrAnalyze *ira,
-        IrInstructionCanImplicitCast *instruction)
-{
-    IrInstruction *type_value = instruction->type_value->other;
-    TypeTableEntry *type_entry = ir_resolve_type(ira, type_value);
-    if (type_is_invalid(type_entry))
-        return ira->codegen->builtin_types.entry_invalid;
-
-    IrInstruction *target_value = instruction->target_value->other;
-    if (type_is_invalid(target_value->value.type))
-        return ira->codegen->builtin_types.entry_invalid;
-
-    ImplicitCastMatchResult result = ir_types_match_with_implicit_cast(ira, type_entry, target_value->value.type,
-            target_value);
-
-    if (result == ImplicitCastMatchResultReportedError) {
-        zig_panic("TODO refactor implicit cast tester to return bool without reporting errors");
-    }
-
-    ConstExprValue *out_val = ir_build_const_from(ira, &instruction->base);
-    out_val->data.x_bool = (result == ImplicitCastMatchResultYes);
-    return ira->codegen->builtin_types.entry_bool;
-}
-
 static TypeTableEntry *ir_analyze_instruction_panic(IrAnalyze *ira, IrInstructionPanic *instruction) {
     IrInstruction *msg = instruction->msg->other;
     if (type_is_invalid(msg->value.type))
@@ -19762,8 +19705,6 @@ static TypeTableEntry *ir_analyze_instruction_nocast(IrAnalyze *ira, IrInstructi
             return ir_analyze_instruction_check_switch_prongs(ira, (IrInstructionCheckSwitchProngs *)instruction);
         case IrInstructionIdCheckStatementIsVoid:
             return ir_analyze_instruction_check_statement_is_void(ira, (IrInstructionCheckStatementIsVoid *)instruction);
-        case IrInstructionIdCanImplicitCast:
-            return ir_analyze_instruction_can_implicit_cast(ira, (IrInstructionCanImplicitCast *)instruction);
         case IrInstructionIdDeclRef:
             return ir_analyze_instruction_decl_ref(ira, (IrInstructionDeclRef *)instruction);
         case IrInstructionIdPanic:
@@ -20043,7 +19984,6 @@ bool ir_has_side_effects(IrInstruction *instruction) {
         case IrInstructionIdIntToEnum:
         case IrInstructionIdIntToErr:
         case IrInstructionIdErrToInt:
-        case IrInstructionIdCanImplicitCast:
         case IrInstructionIdDeclRef:
         case IrInstructionIdErrName:
         case IrInstructionIdTypeName:

src/ir_print.cpp

@@ -913,14 +913,6 @@ static void ir_print_tag_name(IrPrint *irp, IrInstructionTagName *instruction) {
     ir_print_other_instruction(irp, instruction->target);
 }
 
-static void ir_print_can_implicit_cast(IrPrint *irp, IrInstructionCanImplicitCast *instruction) {
-    fprintf(irp->f, "@canImplicitCast(");
-    ir_print_other_instruction(irp, instruction->type_value);
-    fprintf(irp->f, ",");
-    ir_print_other_instruction(irp, instruction->target_value);
-    fprintf(irp->f, ")");
-}
-
 static void ir_print_ptr_type(IrPrint *irp, IrInstructionPtrType *instruction) {
     fprintf(irp->f, "&");
     if (instruction->align_value != nullptr) {
@@ -1524,9 +1516,6 @@ static void ir_print_instruction(IrPrint *irp, IrInstruction *instruction) {
         case IrInstructionIdTagName:
             ir_print_tag_name(irp, (IrInstructionTagName *)instruction);
             break;
-        case IrInstructionIdCanImplicitCast:
-            ir_print_can_implicit_cast(irp, (IrInstructionCanImplicitCast *)instruction);
-            break;
         case IrInstructionIdPtrType:
             ir_print_ptr_type(irp, (IrInstructionPtrType *)instruction);
             break;

test/cases/misc.zig

@@ -523,14 +523,6 @@ test "@typeId" {
     }
 }
 
-test "@canImplicitCast" {
-    comptime {
-        assert(@canImplicitCast(i64, i32(3)));
-        assert(!@canImplicitCast(i32, f32(1.234)));
-        assert(@canImplicitCast([]const u8, "aoeu"));
-    }
-}
-
 test "@typeName" {
     const Struct = struct {};
     const Union = union {