tree-optimization/97255 - missing vector bool pattern of SRAed bool

SRA tends to use VIEW_CONVERT_EXPR when replacing bool fields with
unsigned char fields.  Those are not handled in vector bool pattern
detection causing vector true values to leak.  The following fixes
this by turning those into b ? 1 : 0 as well.

2020-10-01  Richard Biener  <rguenther@suse.de>

	* tree-vect-patterns.c (vect_recog_bool_pattern): Also handle
	VIEW_CONVERT_EXPR.

	* g++.dg/vect/pr97255.cc: New testcase.

2 files changed, 50 insertions, 2 deletions

diff --git a/gcc/testsuite/g++.dg/vect/pr97255.cc b/gcc/testsuite/g++.dg/vect/pr97255.cc
new file mode 100644
index 0000000..efb7f53
--- /dev/null
+++ b/gcc/testsuite/g++.dg/vect/pr97255.cc
@@ -0,0 +1,44 @@
+// { dg-require-effective-target c++11 }
+// { dg-additional-options "-O3" }
+
+template<class T, unsigned N>
+class Array{
+public:
+    T& operator[](unsigned x) {return m_arr[x];}
+private:
+    T m_arr[N];
+};
+
+int
+__attribute__((noipa))
+logicalOr(Array< char, 4 > in1[60],
+          Array< bool, 4 > out[60])
+{
+  for (unsigned k0 = 0u; k0 < 60u; ++k0) {
+      Array< char, 4 > in1m = in1[k0];
+      Array< bool, 4 > x;
+      for (unsigned k1 = 0u; k1 < 4u; ++k1) {
+          char in1s = in1m[k1];
+          x[k1] = in1s != char(0) || in1s != char(0);
+      }
+      out[k0] = x;
+  }
+  return out[0][0];
+}
+
+
+int main()
+{
+  Array< char, 4 > In1[60]{};
+  Array< bool, 4 > Out7[60]{};
+
+  for( int i = 0; i < 60; ++i){
+      for( int j = 0; j < 4; ++j){
+          In1[i][j] = 240 - i*4 - j;
+      }
+  }
+
+  if (logicalOr(In1, Out7) != 1)
+    __builtin_abort ();
+  return 0;
+}
diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
index db45740..d626c5f 100644
--- a/gcc/tree-vect-patterns.c
+++ b/gcc/tree-vect-patterns.c
@@ -4028,14 +4028,18 @@ vect_recog_bool_pattern (vec_info *vinfo,
 
   var = gimple_assign_rhs1 (last_stmt);
   lhs = gimple_assign_lhs (last_stmt);
+  rhs_code = gimple_assign_rhs_code (last_stmt);
+
+  if (rhs_code == VIEW_CONVERT_EXPR)
+    var = TREE_OPERAND (var, 0);
 
   if (!VECT_SCALAR_BOOLEAN_TYPE_P (TREE_TYPE (var)))
     return NULL;
 
   hash_set<gimple *> bool_stmts;
 
-  rhs_code = gimple_assign_rhs_code (last_stmt);
-  if (CONVERT_EXPR_CODE_P (rhs_code))
+  if (CONVERT_EXPR_CODE_P (rhs_code)
+      || rhs_code == VIEW_CONVERT_EXPR)
     {
       if (! INTEGRAL_TYPE_P (TREE_TYPE (lhs))
 	  || TYPE_PRECISION (TREE_TYPE (lhs)) == 1)