xtensa: Clean up xtensa_expand_prologue

gcc/ChangeLog:

	* config/xtensa/xtensa.cc (xtensa_expand_prologue): Modify to
	exit the inspection loops as soon as the necessity of stack
	pointer is found.

diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index 178d16a784621a9dad8e8474e5a5a2c0c3901632..709b0d52d069b9a59726b12b836f09d23088ac0c 100644 (file)
--- a/gcc/config/xtensa/xtensa.cc
+++ b/gcc/config/xtensa/xtensa.cc
@@ -3327,12 +3327,18 @@ xtensa_expand_prologue (void)
             ref; ref = DF_REF_NEXT_REG (ref))
          if (DF_REF_CLASS (ref) == DF_REF_REGULAR
              && NONJUMP_INSN_P (DF_REF_INSN (ref)))
-           stack_pointer_needed = true;
+           {
+             stack_pointer_needed = true;
+             break;
+           }
       /* Check if callee-saved registers really need saving to the stack.  */
       if (!stack_pointer_needed)
        for (regno = 0; regno < FIRST_PSEUDO_REGISTER; ++regno)
          if (xtensa_call_save_reg (regno))
-           stack_pointer_needed = true;
+           {
+             stack_pointer_needed = true;
+             break;
+           }
 
       cfun->machine->inhibit_logues_a1_adjusts = !stack_pointer_needed;