Introduce emit_frame_chain

The current frame code combines the separate concepts of a frame chain
(saving old FP,LR in a record and pointing new FP to it) and a frame
pointer used to access locals.  Add emit_frame_chain to the aarch64_frame
descriptor and use it in the prolog and epilog code.  For now just
initialize it as before, so generated code is identical.

Also correctly set EXIT_IGNORE_STACK.  The current AArch64 epilog code 
restores SP from FP if alloca is used.  If a frame pointer is used but
there is no alloca, SP must remain valid for the epilog to work correctly.

    gcc/
	* config/aarch64/aarch64.h (EXIT_IGNORE_STACK): Set if alloca is used.
	(aarch64_frame): Add emit_frame_chain boolean.
	* config/aarch64/aarch64.c (aarch64_frame_pointer_required)
	Move eh_return case to aarch64_layout_frame.
	(aarch64_layout_frame): Initialize emit_frame_chain.
	(aarch64_expand_prologue): Use emit_frame_chain.

From-SVN: r254114

gcc/ChangeLog

 2017-10-26  Wilco Dijkstra  <wdijkstr@arm.com>
 
+	* config/aarch64/aarch64.h (EXIT_IGNORE_STACK): Set if alloca is used.
+	(aarch64_frame): Add emit_frame_chain boolean.
+	* config/aarch64/aarch64.c (aarch64_frame_pointer_required)
+	Move eh_return case to aarch64_layout_frame.
+	(aarch64_layout_frame): Initialize emit_frame_chain.
+	(aarch64_expand_prologue): Use emit_frame_chain.
+
+2017-10-26  Wilco Dijkstra  <wdijkstr@arm.com>
+
 	* config/aarch64/aarch64.c (aarch64_layout_frame):
 	Ensure LR is always stored at the bottom of the callee-saves.
 	Remove rarely used frame layout which saves callee-saves at top of

gcc/config/aarch64/aarch64.c

@@ -2876,10 +2876,6 @@ aarch64_frame_pointer_required (void)
 	   && !df_regs_ever_live_p (LR_REGNUM)))
     return true;
 
-  /* Force a frame pointer for EH returns so the return address is at FP+8.  */
-  if (crtl->calls_eh_return)
-    return true;
-
   return false;
 }
 
@@ -2896,6 +2892,10 @@ aarch64_layout_frame (void)
   if (reload_completed && cfun->machine->frame.laid_out)
     return;
 
+  /* Force a frame chain for EH returns so the return address is at FP+8.  */
+  cfun->machine->frame.emit_frame_chain
+    = frame_pointer_needed || crtl->calls_eh_return;
+
 #define SLOT_NOT_REQUIRED (-2)
 #define SLOT_REQUIRED     (-1)
 
@@ -2930,7 +2930,7 @@ aarch64_layout_frame (void)
 	last_fp_reg = regno;
       }
 
-  if (frame_pointer_needed)
+  if (cfun->machine->frame.emit_frame_chain)
     {
       /* FP and LR are placed in the linkage record.  */
       cfun->machine->frame.reg_offset[R29_REGNUM] = 0;
@@ -3659,6 +3659,7 @@ aarch64_expand_prologue (void)
   HOST_WIDE_INT callee_offset = cfun->machine->frame.callee_offset;
   unsigned reg1 = cfun->machine->frame.wb_candidate1;
   unsigned reg2 = cfun->machine->frame.wb_candidate2;
+  bool emit_frame_chain = cfun->machine->frame.emit_frame_chain;
   rtx_insn *insn;
 
   /* Sign return address for functions.  */
@@ -3691,7 +3692,7 @@ aarch64_expand_prologue (void)
   if (callee_adjust != 0)
     aarch64_push_regs (reg1, reg2, callee_adjust);
 
-  if (frame_pointer_needed)
+  if (emit_frame_chain)
     {
       if (callee_adjust == 0)
 	aarch64_save_callee_saves (DImode, callee_offset, R29_REGNUM,
@@ -3699,14 +3700,14 @@ aarch64_expand_prologue (void)
       insn = emit_insn (gen_add3_insn (hard_frame_pointer_rtx,
 				       stack_pointer_rtx,
 				       GEN_INT (callee_offset)));
-      RTX_FRAME_RELATED_P (insn) = 1;
+      RTX_FRAME_RELATED_P (insn) = frame_pointer_needed;
       emit_insn (gen_stack_tie (stack_pointer_rtx, hard_frame_pointer_rtx));
     }
 
   aarch64_save_callee_saves (DImode, callee_offset, R0_REGNUM, R30_REGNUM,
-			     callee_adjust != 0 || frame_pointer_needed);
+			     callee_adjust != 0 || emit_frame_chain);
   aarch64_save_callee_saves (DFmode, callee_offset, V0_REGNUM, V31_REGNUM,
-			     callee_adjust != 0 || frame_pointer_needed);
+			     callee_adjust != 0 || emit_frame_chain);
   aarch64_sub_sp (IP1_REGNUM, final_adjust, !frame_pointer_needed);
 }
 

gcc/config/aarch64/aarch64.h

@@ -343,9 +343,9 @@ extern unsigned aarch64_architecture_version;
   (epilogue_completed && (REGNO) == LR_REGNUM)
 
 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
-   the stack pointer does not matter.  The value is tested only in
-   functions that have frame pointers.  */
-#define EXIT_IGNORE_STACK	1
+   the stack pointer does not matter.  This is only true if the function
+   uses alloca.  */
+#define EXIT_IGNORE_STACK	(cfun->calls_alloca)
 
 #define STATIC_CHAIN_REGNUM		R18_REGNUM
 #define HARD_FRAME_POINTER_REGNUM	R29_REGNUM
@@ -595,6 +595,9 @@ struct GTY (()) aarch64_frame
   /* The size of the stack adjustment after saving callee-saves.  */
   HOST_WIDE_INT final_adjust;
 
+  /* Store FP,LR and setup a frame pointer.  */
+  bool emit_frame_chain;
+
   unsigned wb_candidate1;
   unsigned wb_candidate2;