From: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Date: Wed, 15 Jul 2015 16:31:46 +0000 (+0000)
Subject: simplify-rtx.c (simplify_ternary_operation): Add simplification for (!c) != {0,.... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=34222cd6cc4da69d858da0776b5248b3c7b0aa61;p=gcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a2ce483c774..babf07f4901 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+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>
 
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 91e4b9ca0ce..fde99445e54 100644
--- a/gcc/simplify-rtx.c
+++ b/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
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f8ff300032d..84ee7177913 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+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
diff --git a/gcc/testsuite/gcc.target/powerpc/vec-cmp-sel.c b/gcc/testsuite/gcc.target/powerpc/vec-cmp-sel.c
new file mode 100644
index 00000000000..2888216940e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/vec-cmp-sel.c
@@ -0,0 +1,20 @@
+/* { 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;
+}