[COMMITTED] function.c (assign_parm_setup_reg): Handle misaligned stack arguments

[Bernd Edlinger]

Hi!

This is another approved part from my patch "Fix not 8-byte aligned ldrd/strd 
on ARMv5 (PR 89544)"
committed as "obvious".

$ svn diff -r274530:274531 -x -p
Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog       (Revision 274530)
+++ gcc/ChangeLog       (Revision 274531)
@@ -1,3 +1,7 @@
+2019-08-15  Bernd Edlinger  <bernd.edlin...@hotmail.de>
+
+       * function.c (assign_parm_setup_reg): Handle misaligned stack arguments.
+
 2019-08-15  Martin Liska  <mli...@suse.cz>
 
        * tree-ssa-dce.c (propagate_necessity): We can't reach now
Index: gcc/function.c
===================================================================
--- gcc/function.c      (Revision 274530)
+++ gcc/function.c      (Revision 274531)
@@ -3127,6 +3127,7 @@ assign_parm_setup_reg (struct assign_parm_data_all
   int unsignedp = TYPE_UNSIGNED (TREE_TYPE (parm));
   bool did_conversion = false;
   bool need_conversion, moved;
+  enum insn_code icode;
   rtx rtl;
 
   /* Store the parm in a pseudoregister during the function, but we may
@@ -3188,7 +3189,6 @@ assign_parm_setup_reg (struct assign_parm_data_all
         conversion.  We verify that this insn does not clobber any
         hard registers.  */
 
-      enum insn_code icode;
       rtx op0, op1;
 
       icode = can_extend_p (promoted_nominal_mode, data->passed_mode,
@@ -3291,6 +3291,23 @@ assign_parm_setup_reg (struct assign_parm_data_all
 
       did_conversion = true;
     }
+  else if (MEM_P (data->entry_parm)
+          && GET_MODE_ALIGNMENT (promoted_nominal_mode)
+             > MEM_ALIGN (data->entry_parm)
+          && (((icode = optab_handler (movmisalign_optab,
+                                       promoted_nominal_mode))
+               != CODE_FOR_nothing)
+              || targetm.slow_unaligned_access (promoted_nominal_mode,
+                                                MEM_ALIGN (data->entry_parm))))
+    {
+      if (icode != CODE_FOR_nothing)
+       emit_insn (GEN_FCN (icode) (parmreg, validated_mem));
+      else
+       rtl = parmreg = extract_bit_field (validated_mem,
+                       GET_MODE_BITSIZE (promoted_nominal_mode), 0,
+                       unsignedp, parmreg,
+                       promoted_nominal_mode, VOIDmode, false, NULL);
+    }
   else
     emit_move_insn (parmreg, validated_mem);
 


Thanks
Bernd.