rs6000: Fix shrink-wrap-separate for AIX

All out-of-line register save routines need LR, so we cannot wrap the
LR component if there are out-of-line saves.  This didn't show up for
testing on Linux because none of the tests there use out-of-line FPR
saves without also using out-of-line GPR saves, which we did handle.

This patch fixes it, and also cleans up code a little.


	* config/rs6000/rs6000.c (rs6000_get_separate_components): Do not
	make LR a separately shrink-wrapped component unless savres_strategy
	contains all of {SAVE,REST}_INLINE_{GPRS,FPRS,VRS}.  Do not wrap
	GPRs unless both {SAVE,REST}_INLINE_GPRS.  Do not disallow all
	wrapping when not both {SAVE,REST}_INLINE_GPRS.

From-SVN: r241203

gcc/ChangeLog

+2016-10-15  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.c (rs6000_get_separate_components): Do not
+	make LR a separately shrink-wrapped component unless savres_strategy
+	contains all of {SAVE,REST}_INLINE_{GPRS,FPRS,VRS}.  Do not wrap
+	GPRs unless both {SAVE,REST}_INLINE_GPRS.  Do not disallow all
+	wrapping when not both {SAVE,REST}_INLINE_GPRS.
+
 2016-10-15  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* optabs.c (expand_parity): Fix mode mismatch, add final conversion

gcc/config/rs6000/rs6000.c

@@ -27439,27 +27439,29 @@ rs6000_get_separate_components (void)
 {
   rs6000_stack_t *info = rs6000_stack_info ();
 
-  if (!(info->savres_strategy & SAVE_INLINE_GPRS)
-      || !(info->savres_strategy & REST_INLINE_GPRS)
-      || WORLD_SAVE_P (info))
+  if (WORLD_SAVE_P (info))
     return NULL;
 
   sbitmap components = sbitmap_alloc (32);
   bitmap_clear (components);
 
   /* The GPRs we need saved to the frame.  */
-  int reg_size = TARGET_32BIT ? 4 : 8;
-  int offset = info->gp_save_offset;
-  if (info->push_p)
-    offset += info->total_size;
-
-  for (unsigned regno = info->first_gp_reg_save; regno < 32; regno++)
+  if ((info->savres_strategy & SAVE_INLINE_GPRS)
+      && (info->savres_strategy & REST_INLINE_GPRS))
     {
-      if (IN_RANGE (offset, -0x8000, 0x7fff)
-	  && rs6000_reg_live_or_pic_offset_p (regno))
-	bitmap_set_bit (components, regno);
+      int reg_size = TARGET_32BIT ? 4 : 8;
+      int offset = info->gp_save_offset;
+      if (info->push_p)
+	offset += info->total_size;
 
-      offset += reg_size;
+      for (unsigned regno = info->first_gp_reg_save; regno < 32; regno++)
+	{
+	  if (IN_RANGE (offset, -0x8000, 0x7fff)
+	      && rs6000_reg_live_or_pic_offset_p (regno))
+	    bitmap_set_bit (components, regno);
+
+	  offset += reg_size;
+	}
     }
 
   /* Don't mess with the hard frame pointer.  */
@@ -27472,11 +27474,18 @@ rs6000_get_separate_components (void)
       || (flag_pic && DEFAULT_ABI == ABI_DARWIN))
     bitmap_clear_bit (components, RS6000_PIC_OFFSET_TABLE_REGNUM);
 
-  /* Optimize LR save and restore if we can.  This is component 0.  */
+  /* Optimize LR save and restore if we can.  This is component 0.  Any
+     out-of-line register save/restore routines need LR.  */
   if (info->lr_save_p
-      && !(flag_pic && (DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_DARWIN)))
+      && !(flag_pic && (DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_DARWIN))
+      && (info->savres_strategy & SAVE_INLINE_GPRS)
+      && (info->savres_strategy & REST_INLINE_GPRS)
+      && (info->savres_strategy & SAVE_INLINE_FPRS)
+      && (info->savres_strategy & REST_INLINE_FPRS)
+      && (info->savres_strategy & SAVE_INLINE_VRS)
+      && (info->savres_strategy & REST_INLINE_VRS))
     {
-      offset = info->lr_save_offset;
+      int offset = info->lr_save_offset;
       if (info->push_p)
 	offset += info->total_size;
       if (IN_RANGE (offset, -0x8000, 0x7fff))