stage2 ARM: implement addwrap, subwrap, mulwrap

src/arch/arm/CodeGen.zig

@@ -530,13 +530,13 @@ fn genBody(self: *Self, body: []const Air.Inst.Index) InnerError!void {
         switch (air_tags[inst]) {
             // zig fmt: off
             .add, .ptr_add   => try self.airBinOp(inst),
-            .addwrap         => try self.airAddWrap(inst),
+            .addwrap         => try self.airBinOp(inst),
             .add_sat         => try self.airAddSat(inst),
             .sub, .ptr_sub   => try self.airBinOp(inst),
-            .subwrap         => try self.airSubWrap(inst),
+            .subwrap         => try self.airBinOp(inst),
             .sub_sat         => try self.airSubSat(inst),
             .mul             => try self.airBinOp(inst),
-            .mulwrap         => try self.airMulWrap(inst),
+            .mulwrap         => try self.airBinOp(inst),
             .mul_sat         => try self.airMulSat(inst),
             .rem             => try self.airRem(inst),
             .mod             => try self.airMod(inst),
@@ -2237,6 +2237,39 @@ fn binOp(
                 else => unreachable,
             }
         },
+        .addwrap,
+        .subwrap,
+        .mulwrap,
+        => {
+            const base_tag: Air.Inst.Tag = switch (tag) {
+                .addwrap => .add,
+                .subwrap => .sub,
+                .mulwrap => .mul,
+                else => unreachable,
+            };
+
+            // Generate an add/sub/mul
+            const result = try self.binOp(base_tag, maybe_inst, lhs, rhs, lhs_ty, rhs_ty);
+
+            // Truncate if necessary
+            switch (lhs_ty.zigTypeTag()) {
+                .Vector => return self.fail("TODO ARM binary operations on vectors", .{}),
+                .Int => {
+                    const int_info = lhs_ty.intInfo(self.target.*);
+                    if (int_info.bits <= 32) {
+                        const result_reg = result.register;
+
+                        if (int_info.bits < 32) {
+                            try self.truncRegister(result_reg, result_reg, int_info.signedness, int_info.bits);
+                            return result;
+                        } else return result;
+                    } else {
+                        return self.fail("TODO ARM binary operations on integers > u32/i32", .{});
+                    }
+                },
+                else => unreachable,
+            }
+        },
         .bit_and,
         .bit_or,
         .xor,

test/behavior/bugs/11181.zig

@@ -2,7 +2,6 @@ const builtin = @import("builtin");
 
 test "const inferred array of slices" {
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
 
     const T = struct { v: bool };
@@ -17,7 +16,6 @@ test "const inferred array of slices" {
 
 test "var inferred array of slices" {
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
 
     const T = struct { v: bool };

test/behavior/cast.zig

@@ -1080,7 +1080,6 @@ test "compile time int to ptr of function" {
 
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
 

test/behavior/fn.zig

@@ -389,7 +389,6 @@ test "ability to give comptime types and non comptime types to same parameter" {
 test "function with inferred error set but returning no error" {
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
 
     const S = struct {
         fn foo() !void {}

test/behavior/math.zig

@@ -484,7 +484,6 @@ fn mod(comptime T: type, a: T, b: T) T {
 test "unsigned wrapping" {
     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
 
     try testUnsignedWrappingEval(maxInt(u32));
     comptime try testUnsignedWrappingEval(maxInt(u32));
@@ -499,7 +498,6 @@ fn testUnsignedWrappingEval(x: u32) !void {
 test "signed wrapping" {
     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
 
     try testSignedWrappingEval(maxInt(i32));
     comptime try testSignedWrappingEval(maxInt(i32));
@@ -514,7 +512,6 @@ fn testSignedWrappingEval(x: i32) !void {
 test "signed negation wrapping" {
     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
 
     try testSignedNegationWrappingEval(minInt(i16));
     comptime try testSignedNegationWrappingEval(minInt(i16));
@@ -528,7 +525,6 @@ fn testSignedNegationWrappingEval(x: i16) !void {
 test "unsigned negation wrapping" {
     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
 
     try testUnsignedNegationWrappingEval(1);
     comptime try testUnsignedNegationWrappingEval(1);

test/behavior/ptrcast.zig

@@ -59,7 +59,6 @@ fn testReinterpretStructWrappedBytesAsInteger() !void {
 }
 
 test "reinterpret bytes of an array into an extern struct" {
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
 

test/behavior/type.zig

@@ -468,7 +468,6 @@ test "Type.Union from Type.Enum" {
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
 
     const Tag = @Type(.{
@@ -500,7 +499,6 @@ test "Type.Union from regular enum" {
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
 
     const E = enum { working_as_expected };

test/behavior/type_info.zig

@@ -385,7 +385,6 @@ extern fn foo(a: usize, b: bool, ...) callconv(.C) usize;
 extern fn fooAligned(a: usize, b: bool, ...) align(4) callconv(.C) usize;
 
 test "type info: generic function types" {
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
 

test/behavior/void.zig

@@ -19,7 +19,6 @@ test "compare void with void compile time known" {
 }
 
 test "iterate over a void slice" {
-    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
 
     var j: usize = 0;