From: Eric Botcazou <ebotcazou@adacore.com>
Date: Thu, 3 Dec 2020 14:54:14 +0000 (+0100)
Subject: Fix PR middle-end/98099
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=277ff3406d533990e98cf1c2075b9dc9db6fa48a;p=gcc.git

Fix PR middle-end/98099

this replaces the ICE by a sorry message for the use of reverse scalar
storage order with 128-bit decimal floating-point type on 32-bit targets.

gcc/ChangeLog:
	PR middle-end/98099
	* expmed.c (flip_storage_order): In the case of a non-integer mode,
	sorry out if the integer mode to be used instead is not supported.

gcc/testsuite/ChangeLog:
	* gcc.dg/pr98099.c: New test.
---

diff --git a/gcc/expmed.c b/gcc/expmed.c
index ce88f322961..0d600bd7b54 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -412,7 +412,8 @@ flip_storage_order (machine_mode mode, rtx x)
 	  && __builtin_expect (reverse_float_storage_order_supported < 0, 0))
 	check_reverse_float_storage_order_support ();
 
-      if (!int_mode_for_size (GET_MODE_PRECISION (mode), 0).exists (&int_mode))
+      if (!int_mode_for_size (GET_MODE_PRECISION (mode), 0).exists (&int_mode)
+	  || !targetm.scalar_mode_supported_p (int_mode))
 	{
 	  sorry ("reverse storage order for %smode", GET_MODE_NAME (mode));
 	  return x;
diff --git a/gcc/testsuite/gcc.dg/pr98099.c b/gcc/testsuite/gcc.dg/pr98099.c
new file mode 100644
index 00000000000..34909f225ff
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr98099.c
@@ -0,0 +1,12 @@
+/* PR middle-end/98099 */
+/* Reported by G. Steinmetz <gscfq@t-online.de> */
+
+/* { dg-do compile } */
+/* { dg-options "-fsso-struct=big-endian" } */
+
+struct S { _Decimal128 a; };
+
+_Decimal128 f (struct S x)
+{
+  return x.a; /* { dg-message "sorry, unimplemented: reverse storage order" "" { target { ! int128 } } } */
+}