re PR tree-optimization/18977 (LAPACK test xeigtsts segfaults with optimization)

PR tree-optimization/18977
* gcc.c-torture/execute/loop-ivopts-1.c: New testcase.

From-SVN: r95238

gcc/testsuite/ChangeLog

+2005-02-18  James E Wilson  <wilson@specifixinc.com>
+
+	PR tree-optimization/18977
+	* gcc.c-torture/execute/loop-ivopts-1.c: New testcase.
+
 2005-02-18  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	PR target/20054

gcc/testsuite/gcc.c-torture/execute/loop-ivopts-1.c

+/* From PR 18977.  */
+void foo(float * x);
+
+int main()
+{
+  float x[4];
+  foo (x);
+  return 0;
+}
+
+void foo (float *x)
+{
+    int i,j,k;
+    float temp;
+    static float t16[16]={1.,2.,3.,4.,5.,6.,7.,8.,9.,
+			  10.,11.,12.,13.,14.,15.,16.};
+    static float tmp[4]={0.,0.,0.,0.};
+
+    for (i=0; i<4; i++) {
+	k = 3 - i;
+	temp = t16[5*k];
+	for(j=k+1; j<4; j++) {
+	    tmp[k] = t16[k+  j*4] * temp;
+	}
+    }
+    x[0] = tmp[0];
+    x[1] = tmp[1];
+    x[2] = tmp[2];
+    x[3] = tmp[3];
+}