expr: Small optimization [PR102989]

Small optimization to avoid testing modifier multiple times.

2023-08-10  Jakub Jelinek  <jakub@redhat.com>

	PR c/102989
	* expr.cc (expand_expr_real_1) <case MEM_REF>: Add an early return for
	EXPAND_WRITE or EXPAND_MEMORY modifiers to avoid testing it multiple
	times.

diff --git a/gcc/expr.cc b/gcc/expr.cc
index 174f8acb269ab5450fc799516471d5a2bd9b9efa..9a37bff1fdd3d8fd30d50f70327c9329a25f7933 100644 (file)
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -11248,17 +11248,15 @@ expand_expr_real_1 (tree exp, rtx target, machine_mode tmode,
        set_mem_addr_space (temp, as);
        if (TREE_THIS_VOLATILE (exp))
          MEM_VOLATILE_P (temp) = 1;
-       if (modifier != EXPAND_WRITE
-           && modifier != EXPAND_MEMORY
-           && !inner_reference_p
+       if (modifier == EXPAND_WRITE || modifier == EXPAND_MEMORY)
+         return temp;
+       if (!inner_reference_p
            && mode != BLKmode
            && align < GET_MODE_ALIGNMENT (mode))
          temp = expand_misaligned_mem_ref (temp, mode, unsignedp, align,
                                            modifier == EXPAND_STACK_PARM
                                            ? NULL_RTX : target, alt_rtl);
-       if (reverse
-           && modifier != EXPAND_MEMORY
-           && modifier != EXPAND_WRITE)
+       if (reverse)
          temp = flip_storage_order (mode, temp);
        return temp;
       }