[COMMITTED 2/4] xtensa: Clean up xtensa_expand_prologue

[Max Filippov via Gcc-patches]

From: Takayuki 'January June' Suwa <jjsuwa_sys3...@yahoo.co.jp>

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.
---
 gcc/config/xtensa/xtensa.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index 178d16a78462..709b0d52d069 100644
--- 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;
 
-- 
2.30.2