[PATCH] When simplifing BFR of an insert, require a mode precision integral type (PR108688)

[Andrew Pinski via Gcc-patches]

The same problem as PR 88739 has crept in but
this time in match.pd when simplifying bit_field_ref of
an bit_insert. That is we are generating a BIT_FIELD_REF
of a non-mode-precision integral type.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

        PR tree-optimization/108688

gcc/ChangeLog:

        * match.pd (bit_field_ref [bit_insert]):
        Avoid generating BIT_FIELD_REFs of non-mode-precision
        integral operands

gcc/testsuite/ChangeLog:

        * gcc.c-torture/compile/pr108688-1.c: New test.
---
 gcc/match.pd                                     |  4 +++-
 gcc/testsuite/gcc.c-torture/compile/pr108688-1.c | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr108688-1.c

diff --git a/gcc/match.pd b/gcc/match.pd
index c9e8bebede2..d8353072822 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -7487,7 +7487,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
       isize = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (@1)));
   }
   (switch
-   (if (wi::leu_p (wi::to_wide (@ipos), wi::to_wide (@rpos))
+   (if ((!INTEGRAL_TYPE_P (TREE_TYPE (@1))
+         || type_has_mode_precision_p (TREE_TYPE (@1)))
+        && wi::leu_p (wi::to_wide (@ipos), wi::to_wide (@rpos))
        && wi::leu_p (wi::to_wide (@rpos) + wi::to_wide (@rsize),
                      wi::to_wide (@ipos) + isize))
     (BIT_FIELD_REF @1 @rsize { wide_int_to_tree (bitsizetype,
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr108688-1.c 
b/gcc/testsuite/gcc.c-torture/compile/pr108688-1.c
new file mode 100644
index 00000000000..43d782d62bd
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr108688-1.c
@@ -0,0 +1,15 @@
+
+
+union U { signed int d : 7; signed int e : 2; } u;
+int a, b;
+
+void
+foo (void)
+{
+  for (int i = 0; i < 64; i++)
+    {
+      u.d = a;
+      u.e ^= b;
+    }
+}
+
-- 
2.17.1