2010-02-07 Richard Guenther <rguenther@suse.de>

	PR middle-end/42956
	* gimplify.c (gimple_fold_indirect_ref): Avoid generating
	new ARRAY_REFs on variable size element or minimal index arrays.
	Complete.
	* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Use
	gimple_fold_indirect_ref.

	* gcc.c-torture/compile/pr42956.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@156571 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 33 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr42956.c b/gcc/testsuite/gcc.c-torture/compile/pr42956.c
new file mode 100644
index 00000000000..f592d4be4d7
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr42956.c
@@ -0,0 +1,33 @@
+typedef const int cint;
+typedef struct {
+} Bounds;
+int ndim_, ncomp_, selectedcomp_, nregions_;
+void *voidregion_;
+typedef struct {
+    double diff, err, spread;
+} Errors;
+typedef const Errors cErrors;
+void Split(int iregion, int depth, int xregion)
+{
+  typedef struct {
+      double avg, err, spread, chisq;
+      double xmin[ndim_], xmax[ndim_];
+  } Result;
+  typedef struct region {
+      Result result[ncomp_];
+  } Region;
+  Errors errors[ncomp_];
+  int comp, ireg, xreg;
+  for( ireg = iregion, xreg = xregion; ireg < nregions_; ireg = xreg++ )
+    {
+      Result *result = ((Region *)voidregion_)[ireg].result;
+      for( comp = 0; comp < ncomp_; ++comp )
+	{
+	  Result *r = &result[comp];
+	  cErrors *e = &errors[comp];
+	  double c = e->diff;
+	  if( r->err > 0 ) r->err = r->err*e->err + c;
+	}
+    }
+}
+