epiphany.c (epiphany_rtx_cost): Compare with CC_N_NE / CC_C_LTU / CC_C_GTU…

epiphany.c (epiphany_rtx_cost): Compare with CC_N_NE / CC_C_LTU / CC_C_GTU carries no extra cost for its operands.

    gcc:
            * config/epiphany/epiphany.c (epiphany_rtx_cost): Compare
            with CC_N_NE / CC_C_LTU / CC_C_GTU carries no extra cost for
            its operands.
    gcc/testsuite:
            * gcc.target/epiphany/btst-1.c: New test.

From-SVN: r209319

gcc/ChangeLog

 2014-04-11  Joern Rennecke  <joern.rennecke@embecosm.com>
 
+	* config/epiphany/epiphany.c (epiphany_rtx_cost): Compare
+	with CC_N_NE / CC_C_LTU / CC_C_GTU carries no extra cost for
+	its operands.
+
+2014-04-11  Joern Rennecke  <joern.rennecke@embecosm.com>
+
 	PR rtl-optimization/60651
 	* mode-switching.c (optimize_mode_switching): Make sure to emit
 	sets of a lower numbered entity before sets of a higher numbered

gcc/config/epiphany/epiphany.c

@@ -763,6 +763,19 @@ epiphany_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
       *total = COSTS_N_INSNS (1);
       return true;
 
+    case COMPARE:
+      switch (GET_MODE (x))
+	{
+	/* There are a number of single-insn combiner patterns that use
+	   the flag side effects of arithmetic.  */
+	case CC_N_NEmode:
+	case CC_C_LTUmode:
+	case CC_C_GTUmode:
+	  return true;
+	default:
+	  return false;
+	}
+
     default:
       return false;
     }

gcc/testsuite/ChangeLog

 2014-04-11  Joern Rennecke  <joern.rennecke@embecosm.com>
 
+	* gcc.target/epiphany/btst-1.c: New test.
+
+2014-04-11  Joern Rennecke  <joern.rennecke@embecosm.com>
+
 	PR rtl-optimization/60651
 	* gcc.target/epiphany/mode-switch.c: New test.
 

gcc/testsuite/gcc.target/epiphany/btst-1.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-common" } */
+/* { dg-final { scan-assembler-not "movt" } } */
+/* { dg-final { scan-assembler-not "and" } } */
+/* { dg-final { scan-assembler "lsl" } } */
+
+int
+tst (int i)
+{
+  return (i & (1<<21)) ? 6 : 9;
+}