[PATCH 9/15] arm: Set again stack pointer as CFA reg when popping if necessary

[Andrea Corallo via Gcc-patches]

Hi all,

this patch enables 'arm_emit_multi_reg_pop' to set again the stack
pointer as CFA reg when popping if this is necessary.

/gcc/

        * config/arm/arm.cc (arm_emit_multi_reg_pop): If the frame pointer
        was set define again the stack pointer as CFA reg when popping.


diff --git a/gcc/config/arm/arm.cc b/gcc/config/arm/arm.cc
index ceec14f84b6..a5cf4225aa2 100644
--- a/gcc/config/arm/arm.cc
+++ b/gcc/config/arm/arm.cc
@@ -22303,8 +22303,18 @@ arm_emit_multi_reg_pop (unsigned long saved_regs_mask)
 
   REG_NOTES (par) = dwarf;
   if (!return_in_pc)
-    arm_add_cfa_adjust_cfa_note (par, UNITS_PER_WORD * num_regs,
-                                stack_pointer_rtx, stack_pointer_rtx);
+    {
+      /* If the frame pointer was set define again the stack pointer
+         as CFA reg.  */
+      if (frame_pointer_needed)
+        {
+          RTX_FRAME_RELATED_P (par) = 1;
+          add_reg_note (par, REG_CFA_DEF_CFA, stack_pointer_rtx);
+        }
+      else
+        arm_add_cfa_adjust_cfa_note (par, UNITS_PER_WORD * num_regs,
+                                     stack_pointer_rtx, stack_pointer_rtx);
+    }
 }
 
 /* Generate and emit an insn pattern that we will recognize as a pop_multi