i386: Skip decimal float vector modes in type_natural_mode [PR79754]

2022-02-12  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/79754
	* config/i386/i386.cc (type_natural_mode):
	Skip decimal float vector modes.

gcc/testsuite/ChangeLog:

	PR target/79754
	* gcc.target/i386/pr79754.c: New test.

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 6b97a2b..cf246e7 100644 (file)
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -1876,10 +1876,14 @@ type_natural_mode (const_tree type, const CUMULATIVE_ARGS *cum,
        {
          machine_mode innermode = TYPE_MODE (TREE_TYPE (type));
 
-         /* There are no XFmode vector modes.  */
+         /* There are no XFmode vector modes ...  */
          if (innermode == XFmode)
            return mode;
 
+         /* ... and no decimal float vector modes.  */
+         if (DECIMAL_FLOAT_MODE_P (innermode))
+           return mode;
+
          if (TREE_CODE (TREE_TYPE (type)) == REAL_TYPE)
            mode = MIN_MODE_VECTOR_FLOAT;
          else

diff --git a/gcc/testsuite/gcc.target/i386/pr79754.c b/gcc/testsuite/gcc.target/i386/pr79754.c
new file mode 100644 (file)
index 0000000..27845c9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr79754.c
@@ -0,0 +1,7 @@
+/* PR target/79754 */
+/* { dg-do compile } */
+/* { dg-options "-Wno-psabi" } */
+
+typedef _Decimal32 V __attribute__ ((vector_size(16)));
+
+V fn1 (V a) { return a; }