From: H.J. Lu <hongjiu.lu@intel.com>
Date: Thu, 18 Oct 2018 21:29:55 +0000 (+0000)
Subject: Limit mask of vec_merge to HOST_BITS_PER_WIDE_INT
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=28dd75a330e7cc929a6be489ea3c252dd4a8bd8a;p=gcc.git

Limit mask of vec_merge to HOST_BITS_PER_WIDE_INT

Since mask of vec_merge is in HOST_WIDE_INT, HOST_BITS_PER_WIDE_INT is
the maximum number of vector elements.

	* simplify-rtx.c (simplify_subreg): Limit mask of vec_merge to
	HOST_BITS_PER_WIDE_INT.
	(test_vector_ops_duplicate): Likewise.

From-SVN: r265290
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e36ecd20e66..7c5f9dd4814 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2018-10-18  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* simplify-rtx.c (simplify_subreg): Limit mask of vec_merge to
+	HOST_BITS_PER_WIDE_INT.
+	(test_vector_ops_duplicate): Likewise.
+
 2018-10-18  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/72782
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index ccf92166356..2ff68ceb4e3 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -6611,6 +6611,7 @@ simplify_subreg (machine_mode outermode, rtx op,
    */
   unsigned int idx;
   if (constant_multiple_p (byte, GET_MODE_SIZE (outermode), &idx)
+      && idx < HOST_BITS_PER_WIDE_INT
       && GET_CODE (op) == VEC_MERGE
       && GET_MODE_INNER (innermode) == outermode
       && CONST_INT_P (XEXP (op, 2))
@@ -6861,6 +6862,8 @@ test_vector_ops_duplicate (machine_mode mode, rtx scalar_reg)
       rtx vector_reg = make_test_reg (mode);
       for (unsigned HOST_WIDE_INT i = 0; i < const_nunits; i++)
 	{
+	  if (i >= HOST_BITS_PER_WIDE_INT)
+	    break;
 	  rtx mask = GEN_INT ((HOST_WIDE_INT_1U << i) | (i + 1));
 	  rtx vm = gen_rtx_VEC_MERGE (mode, duplicate, vector_reg, mask);
 	  poly_uint64 offset = i * GET_MODE_SIZE (inner_mode);