Fix IPA ICF with ASM statements (PR inline-asm/82001).

2017-08-30  Martin Liska  <mliska@suse.cz>

	PR inline-asm/82001
	* ipa-icf-gimple.c (func_checker::compare_tree_list_operand):
	Rename to ...
	(func_checker::compare_asm_inputs_outputs): ... this function.
	(func_checker::compare_gimple_asm): Use the function to compare
	also ASM constrains.
	* ipa-icf-gimple.h: Rename the function.
2017-08-30  Martin Liska  <mliska@suse.cz>

	PR inline-asm/82001
	* gcc.dg/ipa/pr82001.c: New test.

From-SVN: r251530

gcc/ChangeLog

+2017-08-30  Martin Liska  <mliska@suse.cz>
+
+	PR inline-asm/82001
+	* ipa-icf-gimple.c (func_checker::compare_tree_list_operand):
+	Rename to ...
+	(func_checker::compare_asm_inputs_outputs): ... this function.
+	(func_checker::compare_gimple_asm): Use the function to compare
+	also ASM constrains.
+	* ipa-icf-gimple.h: Rename the function.
+
 2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>

gcc/ipa-icf-gimple.c

@@ -543,11 +543,8 @@ func_checker::compare_operand (tree t1, tree t2)
     }
 }
 
-/* Compares two tree list operands T1 and T2 and returns true if these
-   two trees are semantically equivalent.  */
-
 bool
-func_checker::compare_tree_list_operand (tree t1, tree t2)
+func_checker::compare_asm_inputs_outputs (tree t1, tree t2)
 {
   gcc_assert (TREE_CODE (t1) == TREE_LIST);
   gcc_assert (TREE_CODE (t2) == TREE_LIST);
@@ -560,6 +557,16 @@ func_checker::compare_tree_list_operand (tree t1, tree t2)
       if (!compare_operand (TREE_VALUE (t1), TREE_VALUE (t2)))
 	return return_false ();
 
+      tree p1 = TREE_PURPOSE (t1);
+      tree p2 = TREE_PURPOSE (t2);
+
+      gcc_assert (TREE_CODE (p1) == TREE_LIST);
+      gcc_assert (TREE_CODE (p2) == TREE_LIST);
+
+      if (strcmp (TREE_STRING_POINTER (TREE_VALUE (p1)),
+		  TREE_STRING_POINTER (TREE_VALUE (p2))) != 0)
+	return return_false ();
+
       t2 = TREE_CHAIN (t2);
     }
 
@@ -1008,7 +1015,7 @@ func_checker::compare_gimple_asm (const gasm *g1, const gasm *g2)
       tree input1 = gimple_asm_input_op (g1, i);
       tree input2 = gimple_asm_input_op (g2, i);
 
-      if (!compare_tree_list_operand (input1, input2))
+      if (!compare_asm_inputs_outputs (input1, input2))
 	return return_false_with_msg ("ASM input is different");
     }
 
@@ -1017,7 +1024,7 @@ func_checker::compare_gimple_asm (const gasm *g1, const gasm *g2)
       tree output1 = gimple_asm_output_op (g1, i);
       tree output2 = gimple_asm_output_op (g2, i);
 
-      if (!compare_tree_list_operand (output1, output2))
+      if (!compare_asm_inputs_outputs (output1, output2))
 	return return_false_with_msg ("ASM output is different");
     }
 

gcc/ipa-icf-gimple.h

@@ -215,9 +215,9 @@ public:
      is returned.  */
   bool compare_operand (tree t1, tree t2);
 
-  /* Compares two tree list operands T1 and T2 and returns true if these
-     two trees are semantically equivalent.  */
-  bool compare_tree_list_operand (tree t1, tree t2);
+  /* Compares GIMPLE ASM inputs (or outputs) where we iterate tree chain
+     and compare both TREE_PURPOSEs and TREE_VALUEs.  */
+  bool compare_asm_inputs_outputs (tree t1, tree t2);
 
   /* Verifies that trees T1 and T2, representing function declarations
      are equivalent from perspective of ICF.  */

gcc/testsuite/ChangeLog

 2017-08-30  Martin Liska  <mliska@suse.cz>
 
+	PR inline-asm/82001
+	* gcc.dg/ipa/pr82001.c: New test.
+
+2017-08-30  Martin Liska  <mliska@suse.cz>
+
 	* gcc.dg/tree-ssa/vrp104.c: Change dump file name.
 
 2017-08-30  Richard Biener  <rguenther@suse.de>

gcc/testsuite/gcc.dg/ipa/pr82001.c

+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O2 -fdump-ipa-icf-details"  } */
+
+int
+mullo (int a, int b)
+{
+  asm("mul %%edx   # %%1 was %1"
+      : "+"
+	"a"(a),
+	"+d"(b));
+  return a;
+}
+
+int
+mulhi (int a, int b)
+{
+  asm("mul %%edx   # %%1 was %1" : "+d"(a), "+a"(b));
+  return a;
+}
+
+/* { dg-final { scan-ipa-dump "Equal symbols: 0" "icf"  } } */