[committed] Fix PR target/86790 (m68k)

[committed] Fix PR target/86790 (m68k)

[Jeff Law]

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While m68k does have branch prediction, it's a dead architecture, does
not have out of order properties and AFAIK doesn't have a suitably
accurate timer.  Thus, it doesn't seem worth trying to do any spectre v1
mitigations.

Committed to the trunk.

Jeff

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commit 78095ef84bbe24cd371a4a3baeaf83944efac6a2
Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Aug 2 17:50:16 2018 +0000

            PR target/86790
            * config/m68k/m68k.c (TARGET_HAVE_SPECULATION_SAFE_VALUE):
            Define to speculation_safe_value_not_needed.
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@263272 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 06db972e5d6..762e14ef224 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2018-08-02  Jeff Law  <law@redhat.com>
 
+	PR target/86790
+	* config/m68k/m68k.c (TARGET_HAVE_SPECULATION_SAFE_VALUE):
+	Define to speculation_safe_value_not_needed.
+
 	PR target/86784
 	* config/h8300/h8300.c (TARGET_HAVE_SPECULATION_SAFE_VALUE):
 	Define to speculation_safe_value_not_needed.
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index ef8604ebe3d..75a5a5b69b9 100644
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -353,6 +353,9 @@ static machine_mode m68k_promote_function_mode (const_tree, machine_mode,
 #undef TARGET_PROMOTE_FUNCTION_MODE
 #define TARGET_PROMOTE_FUNCTION_MODE m68k_promote_function_mode
 
+#undef  TARGET_HAVE_SPECULATION_SAFE_VALUE
+#define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed
+
 static const struct attribute_spec m68k_attribute_table[] =
 {
   /* { name, min_len, max_len, decl_req, type_req, fn_type_req,