re PR rtl-optimization/41574 (Distribute floating point expressions causes bad code [4.4 only])

2009-10-08  Doug Kwan  <dougkwan@google.com>

	PR rtl-optimization/41574
	* gcc.dg/pr41574.c: New test.

From-SVN: r152580

gcc/testsuite/ChangeLog

+2009-10-08  Doug Kwan  <dougkwan@google.com>
+
+	PR rtl-optimization/41574
+	* gcc.dg/pr41574.c: New test.
+
 2009-10-08  Cary Coutant  <ccoutant@google.com>
 
 	Add support for debugging with ICF (Identical Code Folding).

gcc/testsuite/gcc.dg/pr41574.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fno-unsafe-math-optimizations -fdump-rtl-combine" { target { arm*-*-* } } } */
+/* { dg-options "-O2 -fno-unsafe-math-optimizations -fdump-rtl-combine" { target { ! arm*-*-* } } } */
+
+
+static const double one=1.0;
+
+double
+f(double x)
+{
+  return x*(one+x);
+}
+
+/* { dg-final { scan-rtl-dump-not "\\(plus:DF \\(mult:DF" "combine" } } */
+/* { dg-final { cleanup-rtl-dump "combine*" } } */