Value: use interned values for min and max int for types

This allows _BitInt's to use min/max int

src/aro/Compilation.zig

@@ -994,13 +994,28 @@ fn generateVaListType(comp: *Compilation) !Type {
 fn generateIntMax(comp: *const Compilation, w: anytype, name: []const u8, ty: Type) !void {
     const bit_count: u8 = @intCast(ty.sizeof(comp).? * 8);
     const unsigned = ty.isUnsignedInt(comp);
-    const max = if (bit_count == 128)
-        @as(u128, if (unsigned) std.math.maxInt(u128) else std.math.maxInt(u128))
-    else
-        ty.maxInt(comp);
+    const max: u128 = switch (bit_count) {
+        8 => if (unsigned) std.math.maxInt(u8) else std.math.maxInt(i8),
+        16 => if (unsigned) std.math.maxInt(u16) else std.math.maxInt(i16),
+        32 => if (unsigned) std.math.maxInt(u32) else std.math.maxInt(i32),
+        64 => if (unsigned) std.math.maxInt(u64) else std.math.maxInt(i64),
+        128 => if (unsigned) std.math.maxInt(u128) else std.math.maxInt(i128),
+        else => unreachable,
+    };
     try w.print("#define __{s}_MAX__ {d}{s}\n", .{ name, max, ty.intValueSuffix(comp) });
 }
 
+/// Largest value that can be stored in wchar_t
+pub fn wcharMax(comp: *const Compilation) u32 {
+    const unsigned = comp.types.wchar.isUnsignedInt(comp);
+    return switch (comp.types.wchar.bitSizeof(comp).?) {
+        8 => if (unsigned) std.math.maxInt(u8) else std.math.maxInt(i8),
+        16 => if (unsigned) std.math.maxInt(u16) else std.math.maxInt(i16),
+        32 => if (unsigned) std.math.maxInt(u32) else std.math.maxInt(i32),
+        else => unreachable,
+    };
+}
+
 fn generateExactWidthIntMax(comp: *const Compilation, w: anytype, specifier: Type.Specifier) !void {
     var ty = Type{ .specifier = specifier };
     const bit_count: u8 = @intCast(ty.sizeof(comp).? * 8);

src/aro/Parser.zig

@@ -2814,14 +2814,12 @@ fn enumerator(p: *Parser, e: *Enumerator) Error!?EnumFieldAndNode {
     if (err_start == p.comp.diagnostics.list.items.len) {
         // only do these warnings if we didn't already warn about overflow or non-representable values
         if (e.res.val.compare(.lt, Value.zero, p.comp)) {
-            const min_int = (Type{ .specifier = .int }).minInt(p.comp);
-            const min_val = try Value.int(min_int, p.comp);
+            const min_val = try Value.minInt(Type.int, p.comp);
             if (e.res.val.compare(.lt, min_val, p.comp)) {
                 try p.errStr(.enumerator_too_small, name_tok, try e.res.str(p));
             }
         } else {
-            const max_int = (Type{ .specifier = .int }).maxInt(p.comp);
-            const max_val = try Value.int(max_int, p.comp);
+            const max_val = try Value.maxInt(Type.int, p.comp);
             if (e.res.val.compare(.gt, max_val, p.comp)) {
                 try p.errStr(.enumerator_too_large, name_tok, try e.res.str(p));
             }
@@ -6024,8 +6022,8 @@ pub const Result = struct {
     }
 
     fn intFitsInType(res: Result, p: *Parser, ty: Type) !bool {
-        const max_int = try Value.int(ty.maxInt(p.comp), p.comp);
-        const min_int = try Value.int(ty.minInt(p.comp), p.comp);
+        const max_int = try Value.maxInt(ty, p.comp);
+        const min_int = try Value.minInt(ty, p.comp);
         return res.val.compare(.lte, max_int, p.comp) and
             (res.ty.isUnsignedInt(p.comp) or res.val.compare(.gte, min_int, p.comp));
     }
@@ -8371,8 +8369,10 @@ fn fixedSizeInt(p: *Parser, base: u8, buf: []const u8, suffix: NumberSuffix, tok
         if (!p.in_macro) try p.value_map.put(res.node, res.val);
         return res;
     }
+    const interned_val = try Value.int(val, p.comp);
     if (suffix.isSignedInteger()) {
-        if (val > p.comp.types.intmax.maxInt(p.comp)) {
+        const max_int = try Value.maxInt(p.comp.types.intmax, p.comp);
+        if (interned_val.compare(.gt, max_int, p.comp)) {
             try p.errTok(.implicitly_unsigned_literal, tok_i);
         }
     }
@@ -8400,8 +8400,8 @@ fn fixedSizeInt(p: *Parser, base: u8, buf: []const u8, suffix: NumberSuffix, tok
     for (specs) |spec| {
         res.ty = Type{ .specifier = spec };
         if (res.ty.compareIntegerRanks(suffix_ty, p.comp).compare(.lt)) continue;
-        const max_int = res.ty.maxInt(p.comp);
-        if (val <= max_int) break;
+        const max_int = try Value.maxInt(res.ty, p.comp);
+        if (interned_val.compare(.lte, max_int, p.comp)) break;
     } else {
         res.ty = .{ .specifier = .ulong_long };
     }

src/aro/Type.zig

@@ -959,31 +959,6 @@ pub fn hasField(ty: Type, name: StringId) bool {
     return false;
 }
 
-// TODO handle bitints
-pub fn minInt(ty: Type, comp: *const Compilation) i64 {
-    std.debug.assert(ty.isInt());
-    if (ty.isUnsignedInt(comp)) return 0;
-    return switch (ty.sizeof(comp).?) {
-        1 => std.math.minInt(i8),
-        2 => std.math.minInt(i16),
-        4 => std.math.minInt(i32),
-        8 => std.math.minInt(i64),
-        else => unreachable,
-    };
-}
-
-// TODO handle bitints
-pub fn maxInt(ty: Type, comp: *const Compilation) u64 {
-    std.debug.assert(ty.isInt());
-    return switch (ty.sizeof(comp).?) {
-        1 => if (ty.isUnsignedInt(comp)) @as(u64, std.math.maxInt(u8)) else std.math.maxInt(i8),
-        2 => if (ty.isUnsignedInt(comp)) @as(u64, std.math.maxInt(u16)) else std.math.maxInt(i16),
-        4 => if (ty.isUnsignedInt(comp)) @as(u64, std.math.maxInt(u32)) else std.math.maxInt(i32),
-        8 => if (ty.isUnsignedInt(comp)) @as(u64, std.math.maxInt(u64)) else std.math.maxInt(i64),
-        else => unreachable,
-    };
-}
-
 const TypeSizeOrder = enum {
     lt,
     gt,

src/aro/Value.zig

@@ -676,11 +676,11 @@ pub fn rem(lhs: Value, rhs: Value, ty: Type, comp: *Compilation) !Value {
 
     const signedness = ty.signedness(comp);
     if (signedness == .signed) {
-        var spaces: [3]BigIntSpace = undefined;
-        const min_val = BigIntMutable.init(&spaces[0].limbs, ty.minInt(comp)).toConst();
-        const negative = BigIntMutable.init(&spaces[1].limbs, -1).toConst();
-        const big_one = BigIntMutable.init(&spaces[2].limbs, 1).toConst();
-        if (lhs_bigint.eql(min_val) and rhs_bigint.eql(negative)) {
+        var spaces: [2]BigIntSpace = undefined;
+        const min_val = try Value.minInt(ty, comp);
+        const negative = BigIntMutable.init(&spaces[0].limbs, -1).toConst();
+        const big_one = BigIntMutable.init(&spaces[1].limbs, 1).toConst();
+        if (lhs.compare(.eq, min_val, comp) and rhs_bigint.eql(negative)) {
             return .{};
         } else if (rhs_bigint.order(big_one).compare(.lt)) {
             // lhs - @divTrunc(lhs, rhs) * rhs
@@ -798,9 +798,9 @@ pub fn shl(res: *Value, lhs: Value, rhs: Value, ty: Type, comp: *Compilation) !b
     const bits: usize = @intCast(ty.bitSizeof(comp).?);
     if (shift > bits) {
         if (lhs_bigint.positive) {
-            res.* = try intern(comp, .{ .int = .{ .u64 = ty.maxInt(comp) } });
+            res.* = try Value.maxInt(ty, comp);
         } else {
-            res.* = try intern(comp, .{ .int = .{ .i64 = ty.minInt(comp) } });
+            res.* = try Value.minInt(ty, comp);
         }
         return true;
     }
@@ -890,6 +890,42 @@ pub fn compare(lhs: Value, op: std.math.CompareOperator, rhs: Value, comp: *cons
     return lhs_bigint.order(rhs_bigint).compare(op);
 }
 
+fn twosCompIntLimit(limit: std.math.big.int.TwosCompIntLimit, ty: Type, comp: *Compilation) !Value {
+    const signedness = ty.signedness(comp);
+    if (limit == .min and signedness == .unsigned) return Value.zero;
+    const mag_bits: usize = @intCast(ty.bitSizeof(comp).?);
+    switch (mag_bits) {
+        inline 8, 16, 32, 64 => |bits| {
+            if (limit == .min) return Value.int(@as(i64, std.math.minInt(std.meta.Int(.signed, bits))), comp);
+            return switch (signedness) {
+                inline else => |sign| Value.int(std.math.maxInt(std.meta.Int(sign, bits)), comp),
+            };
+        },
+        else => {},
+    }
+
+    const sign_bits = @intFromBool(signedness == .signed);
+    const total_bits = mag_bits + sign_bits;
+
+    const limbs = try comp.gpa.alloc(
+        std.math.big.Limb,
+        std.math.big.int.calcTwosCompLimbCount(total_bits),
+    );
+    defer comp.gpa.free(limbs);
+
+    var result_bigint: BigIntMutable = .{ .limbs = limbs, .positive = undefined, .len = undefined };
+    result_bigint.setTwosCompIntLimit(limit, signedness, mag_bits);
+    return Value.intern(comp, .{ .int = .{ .big_int = result_bigint.toConst() } });
+}
+
+pub fn minInt(ty: Type, comp: *Compilation) !Value {
+    return twosCompIntLimit(.min, ty, comp);
+}
+
+pub fn maxInt(ty: Type, comp: *Compilation) !Value {
+    return twosCompIntLimit(.max, ty, comp);
+}
+
 pub fn print(v: Value, ty: Type, comp: *const Compilation, w: anytype) @TypeOf(w).Error!void {
     if (ty.is(.bool)) {
         return w.writeAll(if (v.isZero(comp)) "false" else "true");

src/aro/text_literal.zig

@@ -71,7 +71,7 @@ pub const Kind = enum {
     pub fn maxCodepoint(kind: Kind, comp: *const Compilation) u21 {
         return @intCast(switch (kind) {
             .char => std.math.maxInt(u7),
-            .wide => @min(0x10FFFF, comp.types.wchar.maxInt(comp)),
+            .wide => @min(0x10FFFF, comp.wcharMax()),
             .utf_8 => std.math.maxInt(u7),
             .utf_16 => std.math.maxInt(u16),
             .utf_32 => 0x10FFFF,
@@ -83,7 +83,7 @@ pub const Kind = enum {
     pub fn maxInt(kind: Kind, comp: *const Compilation) u32 {
         return @intCast(switch (kind) {
             .char, .utf_8 => std.math.maxInt(u8),
-            .wide => comp.types.wchar.maxInt(comp),
+            .wide => comp.wcharMax(),
             .utf_16 => std.math.maxInt(u16),
             .utf_32 => std.math.maxInt(u32),
             .unterminated => unreachable,

test/cases/_BitInt min max.c

@@ -0,0 +1,7 @@
+//aro-args -std=c23
+_Static_assert(-10 % -444444444444444442051616WB != 0, "");
+
+enum E: _BitInt(512) {
+    A = -6703903964971298549787012499102923063739682910296196688861780721860882015036773488400937149083451713845015929093243025426876941405973284973216824503042048WB,
+    B = 6703903964971298549787012499102923063739682910296196688861780721860882015036773488400937149083451713845015929093243025426876941405973284973216824503042047WB,
+};