Remove support for nontemporal stores with ssa_names on lhs [PR112976]

When cfgexpand was changed to support expanding from tuple gimple
(r0-95521-g28ed065ef9f345), the code was added to support
doing nontemporal stores with LHS of a SSA_NAME but that will
never be a nontemporal store.
This patch removes that and asserts that expanding with a LHS
of a SSA_NAME is not a nontemporal store.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	PR middle-end/112976
	* cfgexpand.cc (expand_gimple_stmt_1): Remove
	support for expanding nontemporal "moves" with
	ssa names on the LHS.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index eef565eddb5dc7195542e85154b8f3566adac304..cfc5291aa0cdd3095a299a80ea06f8fd3c9ff453 100644 (file)
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -4002,17 +4002,16 @@ expand_gimple_stmt_1 (gimple *stmt)
        else
          {
            rtx target, temp;
-           bool nontemporal = gimple_assign_nontemporal_move_p (assign_stmt);
+           gcc_assert (!gimple_assign_nontemporal_move_p (assign_stmt));
            bool promoted = false;
 
            target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
            if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
              promoted = true;
 
-          /* If we want to use a nontemporal store, force the value to
-             register first.  If we store into a promoted register,
-             don't directly expand to target.  */
-           temp = nontemporal || promoted ? NULL_RTX : target;
+          /* If we store into a promoted register, don't directly
+             expand to target.  */
+           temp = promoted ? NULL_RTX : target;
            temp = expand_expr_real_gassign (assign_stmt, temp,
                                             GET_MODE (target), EXPAND_NORMAL);
 
@@ -4034,8 +4033,6 @@ expand_gimple_stmt_1 (gimple *stmt)
 
                convert_move (SUBREG_REG (target), temp, unsignedp);
              }
-           else if (nontemporal && emit_storent_insn (target, temp))
-             ;
            else
              {
                temp = force_operand (temp, target);