[PATCH 1/2] Add verification of gimple_assign_nontemporal_move_p [PR112976]

[Andrew Pinski <quic_apinski@quicinc.com>]

Currently the middle-end only knows how to support temporal stores
(the undocumented storent optab) so let's verify that the only time
we set nontemporal_move on an assign is if the the lhs is not a
gimple reg.

Bootstrapped and tested on x86_64-linux-gnu no regressions.

gcc/ChangeLog:

	PR middle-end/112976
	* tree-cfg.cc (verify_gimple_assign): Verify that
	nontmporal moves are stores.
	* gimple.h (struct gimple): Note that only
	nontemporal stores are supported.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
---
 gcc/gimple.h    |  3 ++-
 gcc/tree-cfg.cc | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/gcc/gimple.h b/gcc/gimple.h
index 8a8ca109bbf..bd315ffc2dd 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -236,7 +236,8 @@ struct GTY((desc ("gimple_statement_structure (&%h)"), tag ("GSS_BASE"),
      for clearing this bit before using it.  */
   unsigned int visited		: 1;
 
-  /* Nonzero if this tuple represents a non-temporal move.  */
+  /* Nonzero if this tuple represents a non-temporal move; currently
+     only stores are supported.  */
   unsigned int nontemporal_move	: 1;
 
   /* Pass local flags.  These flags are free for any pass to use as
diff --git a/gcc/tree-cfg.cc b/gcc/tree-cfg.cc
index b1ba33018fd..06a96f96be7 100644
--- a/gcc/tree-cfg.cc
+++ b/gcc/tree-cfg.cc
@@ -4837,6 +4837,17 @@ verify_gimple_assign_single (gassign *stmt)
 static bool
 verify_gimple_assign (gassign *stmt)
 {
+  if (gimple_assign_nontemporal_move_p (stmt))
+    {
+      tree lhs = gimple_assign_lhs (stmt);
+      if (is_gimple_reg (lhs))
+	{
+	  error ("nontemporal store lhs cannot a gimple register");
+	  debug_generic_stmt (lhs);
+	  return true;
+	}
+    }
+
   switch (gimple_assign_rhs_class (stmt))
     {
     case GIMPLE_SINGLE_RHS:
-- 
2.43.0