re PR tree-optimization/55008 (Internal compiler error : verify_ssa failed)

gcc:

2012-10-22  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/55008
	* gimple-ssa-strength-reduction.c (find_basis_for_candidate): Don't
	allow a candidate to be a basis for itself under another interpretation.

gcc/testsuite:

2012-10-22  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/55008
	* gcc.dg/tree-ssa/pr55008.c: New test.

From-SVN: r192696

gcc/ChangeLog

+2012-10-22  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	PR tree-optimization/55008
+	* gimple-ssa-strength-reduction.c (find_basis_for_candidate): Don't
+	allow a candidate to be a basis for itself under another interpretation.
+
 2012-10-22  Sharad Singhai  <singhai@google.com>
 
 	* dumpfile.c (dump_phase_enabled_p): Renamed dump_enabled_p. Update

gcc/gimple-ssa-strength-reduction.c

@@ -366,6 +366,7 @@ find_basis_for_candidate (slsr_cand_t c)
       slsr_cand_t one_basis = chain->cand;
 
       if (one_basis->kind != c->kind
+	  || one_basis->cand_stmt == c->cand_stmt
 	  || !operand_equal_p (one_basis->stride, c->stride, 0)
 	  || !types_compatible_p (one_basis->cand_type, c->cand_type)
 	  || !dominated_by_p (CDI_DOMINATORS,

gcc/testsuite/ChangeLog

+2012-10-22  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	PR tree-optimization/55008
+	* gcc.dg/tree-ssa/pr55008.c: New test.
+
 2012-10-22  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/55011

gcc/testsuite/gcc.dg/tree-ssa/pr55008.c

+/* This used to fail to compile; see PR55008.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -w" } */
+
+typedef unsigned long long T;
+
+void f(void)
+{
+    int a, *p;
+
+    T b = 6309343725;
+
+    if(*p ? (b = 1) : 0)
+        if(b - (a = b /= 0) ? : (a + b))
+            while(1);
+}
+