Vect: Make sure the lhs type of .SAT_TRUNC has its mode precision [PR116202]

The .SAT_TRUNC vect pattern recog is valid when the lhs type has
its mode precision.  For example as below, QImode with 1 bit precision
like _Bool is invalid here.

g_12 = (long unsigned int) _2;
_13 = MIN_EXPR <g_12, 1>;
_3 = (_Bool) _13;

The above pattern cannot be recog as .SAT_TRUNC (g_12) because the dest
only has 1 bit precision with QImode mode.  Aka the type doesn't have
the mode precision.

The below tests are passed for this patch.
1. The rv64gcv fully regression tests.
2. The x86 bootstrap tests.
3. The x86 fully regression tests.

	PR target/116202

gcc/ChangeLog:

	* tree-vect-patterns.cc (vect_recog_sat_trunc_pattern): Add the
	type_has_mode_precision_p check for the lhs type.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/pr116202-run-1.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>

diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr116202-run-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/pr116202-run-1.c
new file mode 100644 (file)
index 0000000..d150f20
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr116202-run-1.c
@@ -0,0 +1,24 @@
+/* { dg-do run } */
+/* { dg-options "-O3 -march=rv64gcv_zvl256b -fdump-rtl-expand-details" } */
+
+int b[24];
+_Bool c[24];
+
+int main() {
+  for (int f = 0; f < 4; ++f)
+    b[f] = 6;
+
+  for (int f = 0; f < 24; f += 4)
+    c[f] = ({
+      int g = ({
+        unsigned long g = -b[f];
+        1 < g ? 1 : g;
+      });
+      g;
+    });
+
+  if (c[0] != 1)
+    __builtin_abort ();
+}
+
+/* { dg-final { scan-rtl-dump-not ".SAT_TRUNC " "expand" } } */

diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc
index b2c83cfd21904f89d27e335a4b5918dc9fd9d3d3..87b3dc413b8bfdf0af30db18cfde4fcbfd2a5847 100644 (file)
--- a/gcc/tree-vect-patterns.cc
+++ b/gcc/tree-vect-patterns.cc
@@ -4697,11 +4697,12 @@ vect_recog_sat_trunc_pattern (vec_info *vinfo, stmt_vec_info stmt_vinfo,
 
   tree ops[1];
   tree lhs = gimple_assign_lhs (last_stmt);
+  tree otype = TREE_TYPE (lhs);
 
-  if (gimple_unsigned_integer_sat_trunc (lhs, ops, NULL))
+  if (gimple_unsigned_integer_sat_trunc (lhs, ops, NULL)
+      && type_has_mode_precision_p (otype))
     {
       tree itype = TREE_TYPE (ops[0]);
-      tree otype = TREE_TYPE (lhs);
       tree v_itype = get_vectype_for_scalar_type (vinfo, itype);
       tree v_otype = get_vectype_for_scalar_type (vinfo, otype);
       internal_fn fn = IFN_SAT_TRUNC;