simplify-rtx.c (simplify_ternary_operation): Add simplification for (!c) !=…

simplify-rtx.c (simplify_ternary_operation): Add simplification for (!c) != {0,...,0} ? a : b for vector modes.

[gcc]

2015-07-15  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* simplify-rtx.c (simplify_ternary_operation): Add simplification
	for (!c) != {0,...,0} ? a : b for vector modes.

[gcc/testsuite]

2015-07-15  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* gcc.target/powerpc/vec-cmp-sel.c: New test.

From-SVN: r225840

gcc/ChangeLog

+2015-07-15  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	* simplify-rtx.c (simplify_ternary_operation): Add simplification
+	for (!c) != {0,...,0} ? a : b for vector modes.
+
 2015-07-15  Paolo Bonzini  <bonzini@gnu.org>
 	    Martin Jambor  <mjambor@suse.cz>
 

gcc/simplify-rtx.c

@@ -5247,6 +5247,32 @@ simplify_ternary_operation (enum rtx_code code, machine_mode mode,
 		  && rtx_equal_p (XEXP (op0, 1), op1))))
 	return op2;
 
+      /* Convert (!c) != {0,...,0} ? a : b into
+         c != {0,...,0} ? b : a for vector modes.  */
+      if (VECTOR_MODE_P (GET_MODE (op1))
+	  && GET_CODE (op0) == NE
+	  && GET_CODE (XEXP (op0, 0)) == NOT
+	  && GET_CODE (XEXP (op0, 1)) == CONST_VECTOR)
+	{
+	  rtx cv = XEXP (op0, 1);
+	  int nunits = CONST_VECTOR_NUNITS (cv);
+	  bool ok = true;
+	  for (int i = 0; i < nunits; ++i)
+	    if (CONST_VECTOR_ELT (cv, i) != const0_rtx)
+	      {
+		ok = false;
+		break;
+	      }
+	  if (ok)
+	    {
+	      rtx new_op0 = gen_rtx_NE (GET_MODE (op0),
+					XEXP (XEXP (op0, 0), 0),
+					XEXP (op0, 1));
+	      rtx retval = gen_rtx_IF_THEN_ELSE (mode, new_op0, op2, op1);
+	      return retval;
+	    }
+	}
+
       if (COMPARISON_P (op0) && ! side_effects_p (op0))
 	{
 	  machine_mode cmp_mode = (GET_MODE (XEXP (op0, 0)) == VOIDmode

gcc/testsuite/ChangeLog

+2015-07-15  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	* gcc.target/powerpc/vec-cmp-sel.c: New test.
+
 2015-07-15  Richard Biener  <rguenther@suse.de>
 
 	* lib/objc-torture.exp (OBJC_TORTURE_OPTIONS): Remove

gcc/testsuite/gcc.target/powerpc/vec-cmp-sel.c

+/* { dg-do compile { target powerpc64*-*-* } } */
+/* { dg-require-effective-target powerpc_p8vector_ok } */
+/* { dg-options "-maltivec -O2" } */
+/* { dg-final { scan-assembler "vcmpgtsd" } } */
+/* { dg-final { scan-assembler-not "xxlnor" } } */
+
+/* Test code in simplify-rtx.c that converts
+     (!c) != {0,...,0} ? a : b
+   into
+     c != {0,...,0} ? b : a  */
+
+#include <altivec.h>
+
+vector signed long long foo () {
+  vector signed long long x = { 25399, -12900 };
+  vector signed long long y = { 12178, -9987 };
+  vector bool long long b = vec_cmpge (x, y);
+  vector signed long long z = vec_sel (y, x, b);
+  return z;
+}