some cleanup and bug fix

hblang/src/codegen.rs

@@ -1248,14 +1248,14 @@ impl<'a> Codegen<'a> {
                 let signed = bt::is_signed(ty);
 
                 if let Loc::Imm(mut imm) = right.loc
-                    && let Some(oper) = Self::imm_math_op(op, signed, size, false)
+                    && let Some(oper) = Self::imm_math_op(op, signed, size)
+                {
+                    if matches!(op, T::Add | T::Sub)
+                        && let TypeKind::Pointer(ty) = TypeKind::from_ty(ty)
                     {
-                    if matches!(op, T::Add | T::Sub) {
-                        if bt::is_pointer(left.ty) {
                         let size = self.size_of(self.pointers[ty as usize]);
                         imm *= size;
                     }
-                    }
 
                     self.code.encode(oper(lhs.0, lhs.0, imm));
                     break 'ops Some(Value {
@@ -1381,7 +1381,6 @@ impl<'a> Codegen<'a> {
         op: T,
         signed: bool,
         size: u64,
-        first_imm: bool,
     ) -> Option<fn(u8, u8, u64) -> (usize, [u8; instrs::MAX_SIZE])> {
         use instrs as i;
 
@@ -1402,14 +1401,14 @@ impl<'a> Codegen<'a> {
 
         let ops = match op {
             T::Add => basic_op!(addi8, addi16, addi32, addi64),
-            T::Sub if !first_imm => sub_op!(addi8, addi16, addi32, addi64),
+            T::Sub => sub_op!(addi8, addi16, addi32, addi64),
             T::Mul => basic_op!(muli8, muli16, muli32, muli64),
             T::Band => return Some(i::andi),
             T::Bor => return Some(i::ori),
             T::Xor => return Some(i::xori),
-            T::Shr if signed && !first_imm => basic_op!(srui8, srui16, srui32, srui64),
-            T::Shr if !first_imm => basic_op!(srui8, srui16, srui32, srui64),
-            T::Shl if !first_imm => basic_op!(slui8, slui16, slui32, slui64),
+            T::Shr if signed => basic_op!(srui8, srui16, srui32, srui64),
+            T::Shr => basic_op!(srui8, srui16, srui32, srui64),
+            T::Shl => basic_op!(slui8, slui16, slui32, slui64),
             _ => return None,
         };
 
@@ -1442,7 +1441,7 @@ impl<'a> Codegen<'a> {
         let (lhs, owned) = self.loc_to_reg_ref(&left, size);
 
         if let Loc::Imm(imm) = right
-            && let Some(op) = Self::imm_math_op(op, signed, size, false)
+            && let Some(op) = Self::imm_math_op(op, signed, size)
         {
             self.code.encode(op(lhs, lhs, imm));
             return if let Ctx::Dest(dest) = ctx {

hblang/tests/codegen_tests_arithmetic.txt

@@ -1,3 +1,3 @@
-code size: 209
+code size: 200
 ret: 1
 status: Ok(())

hblang/tests/codegen_tests_different_types.txt

@@ -1,3 +1,3 @@
-code size: 527
+code size: 499
 ret: 512
 status: Ok(())

hblang/tests/codegen_tests_fb_driver.txt

@@ -1,3 +1,3 @@
-code size: 666
+code size: 657
 ret: 0
 status: Ok(())

hblang/tests/codegen_tests_functions.txt

@@ -1,3 +1,3 @@
-code size: 314
+code size: 308
 ret: 44
 status: Ok(())

hblang/tests/codegen_tests_if_statements.txt

@@ -1,3 +1,3 @@
-code size: 287
+code size: 281
 ret: 16
 status: Ok(())

hblang/tests/codegen_tests_loops.txt

@@ -1,3 +1,3 @@
-code size: 290
+code size: 287
 ret: 55
 status: Ok(())

hblang/tests/codegen_tests_pointers.txt

@@ -1,3 +1,3 @@
-code size: 382
+code size: 379
 ret: 0
 status: Ok(())

hblang/tests/codegen_tests_variables.txt

@@ -1,3 +1,3 @@
-code size: 124
+code size: 121
 ret: 0
 status: Ok(())