re PR c++/80297 (Compiler time crash: type mismatch in binary expression)

	PR c++/80297
	* genmatch.c (capture::gen_transform): For GENERIC unshare_expr
	captures used multiple times, except for the last use.
	* generic-match-head.c: Include gimplify.h.

	* g++.dg/torture/pr80297.C: New test.

Co-Authored-By: Richard Biener <rguenther@suse.de>

From-SVN: r246693

gcc/ChangeLog

 2017-04-04  Jakub Jelinek  <jakub@redhat.com>
+	    Richard Biener  <rguenther@suse.de>
+
+	PR c++/80297
+	* genmatch.c (capture::gen_transform): For GENERIC unshare_expr
+	captures used multiple times, except for the last use.
+	* generic-match-head.c: Include gimplify.h.
+
+2017-04-04  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/79390
 	* target.h (struct noce_if_info): Declare.

gcc/generic-match-head.c

@@ -33,6 +33,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "builtins.h"
 #include "dumpfile.h"
 #include "case-cfn-macros.h"
+#include "gimplify.h"
 
 
 /* Routine to determine if the types T1 and T2 are effectively

gcc/genmatch.c

@@ -2525,7 +2525,18 @@ capture::gen_transform (FILE *f, int indent, const char *dest, bool gimple,
 	}
     }
 
-  fprintf_indent (f, indent, "%s = captures[%u];\n", dest, where);
+  /* If in GENERIC some capture is used multiple times, unshare it except
+     when emitting the last use.  */
+  if (!gimple
+      && cinfo->info.exists ()
+      && cinfo->info[cinfo->info[where].same_as].result_use_count > 1)
+    {
+      fprintf_indent (f, indent, "%s = unshare_expr (captures[%u]);\n",
+		      dest, where);
+      cinfo->info[cinfo->info[where].same_as].result_use_count--;
+    }
+  else
+    fprintf_indent (f, indent, "%s = captures[%u];\n", dest, where);
 
   /* ???  Stupid tcc_comparison GENERIC trees in COND_EXPRs.  Deal
      with substituting a capture of that.  */

gcc/testsuite/ChangeLog

 2017-04-04  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/80297
+	* g++.dg/torture/pr80297.C: New test.
+
 	PR tree-optimization/79390
 	* gcc.target/i386/pr79390.c: New test.
 	* gcc.dg/ifcvt-4.c: Use -mtune-ctrl=^one_if_conv_insn for i?86/x86_64.

gcc/testsuite/g++.dg/torture/pr80297.C

+// PR c++/80297
+// { dg-do compile }
+
+extern const unsigned long int b;
+extern const long long int c;
+
+int
+foo ()
+{
+  int a = 809 >> -(b & !c) + b - (long long)(b & !c);
+  return a;
+}