[backport gcc-4.9/trunk r198175, fixes PR57026 regression from PR56982 fix <mikpe@it.uu.se>]

gcc/

2013-04-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/57026
	* tree-vrp.c (simplify_conversion_using_ranges): Do not propagate
	from SSA names occuring in abnormal PHI nodes.

gcc/testsuite/

2013-04-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/57026
	* gcc.dg/torture/pr57026.c: New testcase.

--- gcc-4.8.0/gcc/testsuite/gcc.dg/torture/pr57026.c.~1~	1970-01-01 01:00:00.000000000 +0100
+++ gcc-4.8.0/gcc/testsuite/gcc.dg/torture/pr57026.c	2013-04-27 13:20:07.468871227 +0200
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+
+typedef struct __jmp_buf_tag { char buf[1024]; } jmp_buf[1];
+extern int setjmp (jmp_buf);
+extern int bar (unsigned int *);
+extern jmp_buf *baz (void);
+struct C { int c1; unsigned int c2, c3, c4; };
+
+void
+foo (struct C *x, const int *y, unsigned int *z, unsigned int e, unsigned int g)
+{
+  unsigned int d = 0;
+  unsigned long f;
+  setjmp (*baz ());
+  f = d;
+  if ((x->c1 || x->c2) && g && (!e || d >= 8))
+    d = 16;
+  else
+    d = 8;
+  if ((!x->c3 && !x->c4 || *y == 0) && !e && bar (z))
+    *z = f;
+}
--- gcc-4.8.0/gcc/tree-vrp.c.~1~	2013-02-21 11:52:39.000000000 +0100
+++ gcc-4.8.0/gcc/tree-vrp.c	2013-04-27 13:20:07.468871227 +0200
@@ -8707,7 +8707,8 @@ simplify_conversion_using_ranges (gimple
       || !CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt)))
     return false;
   innerop = gimple_assign_rhs1 (def_stmt);
-  if (TREE_CODE (innerop) != SSA_NAME)
+  if (TREE_CODE (innerop) != SSA_NAME
+      || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (innerop))
     return false;
 
   /* Get the value-range of the inner operand.  */