ipa-inline-analysis.c (param_change_prob): Get to the base object first in all cases.

	* ipa-inline-analysis.c (param_change_prob): Get to the base object
	first in all cases.

From-SVN: r239943

gcc/ChangeLog

+2016-09-01  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* ipa-inline-analysis.c (param_change_prob): Get to the base object
+	first in all cases.
+
 2016-09-01  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.md (*restore_gpregs_<mode>_r11,

gcc/ipa-inline-analysis.c

@@ -2183,28 +2183,33 @@ param_change_prob (gimple *stmt, int i)
 {
   tree op = gimple_call_arg (stmt, i);
   basic_block bb = gimple_bb (stmt);
-  tree base;
 
-  /* Global invariants neve change.  */
-  if (is_gimple_min_invariant (op))
+  if (TREE_CODE (op) == WITH_SIZE_EXPR)
+    op = TREE_OPERAND (op, 0);
+
+  tree base = get_base_address (op);
+
+  /* Global invariants never change.  */
+  if (is_gimple_min_invariant (base))
     return 0;
+
   /* We would have to do non-trivial analysis to really work out what
      is the probability of value to change (i.e. when init statement
      is in a sibling loop of the call). 
 
      We do an conservative estimate: when call is executed N times more often
      than the statement defining value, we take the frequency 1/N.  */
-  if (TREE_CODE (op) == SSA_NAME)
+  if (TREE_CODE (base) == SSA_NAME)
     {
       int init_freq;
 
       if (!bb->frequency)
 	return REG_BR_PROB_BASE;
 
-      if (SSA_NAME_IS_DEFAULT_DEF (op))
+      if (SSA_NAME_IS_DEFAULT_DEF (base))
 	init_freq = ENTRY_BLOCK_PTR_FOR_FN (cfun)->frequency;
       else
-	init_freq = gimple_bb (SSA_NAME_DEF_STMT (op))->frequency;
+	init_freq = gimple_bb (SSA_NAME_DEF_STMT (base))->frequency;
 
       if (!init_freq)
 	init_freq = 1;
@@ -2213,9 +2218,7 @@ param_change_prob (gimple *stmt, int i)
       else
 	return REG_BR_PROB_BASE;
     }
-
-  base = get_base_address (op);
-  if (base)
+  else
     {
       ao_ref refd;
       int max;
@@ -2256,7 +2259,6 @@ param_change_prob (gimple *stmt, int i)
       else
 	return REG_BR_PROB_BASE;
     }
-  return REG_BR_PROB_BASE;
 }
 
 /* Find whether a basic block BB is the final block of a (half) diamond CFG

gcc/testsuite/ChangeLog

+2016-09-01  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/opt58.adb: New test.
+	* gnat.dg/opt58_pkg.ads: New helper.
+
 2016-09-01  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/77436

gcc/testsuite/gnat.dg/opt58.adb

+-- { dg-do compile }
+-- { dg-options "-O" }
+
+with Unchecked_Conversion;
+with System; use System;
+with Opt58_Pkg; use Opt58_Pkg;
+
+procedure Opt58 is
+
+   function Convert is new Unchecked_Conversion (Integer, Rec);
+
+   Dword : Integer := 0;
+   I : Small_Int := F1 (Convert (Dword));
+
+begin
+   if F2 (Null_Address, I = 0) then
+      null;
+   end if;
+end Opt58;

gcc/testsuite/gnat.dg/opt58_pkg.ads

+with System; use System;
+
+package Opt58_Pkg is
+
+   pragma Pure (Opt58_Pkg);
+
+   type Small_Int is range 0 .. 255;
+
+   type Rec is record
+     D1, D2, D3, D4 : Small_Int;
+   end record;
+   pragma Pack (Rec);
+   for Rec'Size use 32;
+
+   function F1 (R : Rec) return Small_Int;
+
+   function F2 (A : Address; B : Boolean) return Boolean;
+
+end Opt58_Pkg;