re PR tree-optimization/48329 (Missed vectorization of reduction due to PRE)

2014-04-30  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/48329
	* gfortran.dg/vect/pr48329.f90: New testcase.

From-SVN: r209930

gcc/testsuite/ChangeLog

+2014-04-30  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/48329
+	* gfortran.dg/vect/pr48329.f90: New testcase.
+
 2014-04-30  Marek Polacek  <polacek@redhat.com>
 
 	* c-c++-common/ubsan/div-by-zero-5.c: Fix formatting.

gcc/testsuite/gfortran.dg/vect/pr48329.f90

+! { dg-do compile }
+! { dg-require-effective-target vect_float }
+! { dg-require-effective-target vect_intfloat_cvt }
+! { dg-additional-options "-ffast-math" }
+
+program calcpi
+
+    implicit none
+    real(kind=4):: h,x,sum,pi
+    integer:: n,i
+    real(kind=4):: f
+
+   f(x) = 4.0/(1.0+x**2)
+
+   n = 2100000000
+
+   h= 1.0 / n
+   sum = 0.0
+  DO i=1, n
+     x = h * (i-0.5)
+     sum = sum + f(x)
+  END DO
+  pi = h * sum
+  write(*,*) 'Pi=',pi
+
+end program calcpi
+
+! { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } }
+! { dg-final { cleanup-tree-dump "vect" } }