[patch committed SH] Fix PR target/78426

[Kaz Kojima]

I've applied the attached patch to fix PR target/78426 which is
a regression caused by rtl sharing with sh_expand_{cmpnstr,setmem}.
Tested with "make -k check" on sh4-unknown-linux-gnu.  I'll backport
it to release branches.

Regards,
        kaz
--
2016-11-19  Kaz Kojima  <kkoj...@gcc.gnu.org>

        PR target/78426
        * config/sh/sh-mem.cc (sh_expand_cmpnstr): Use copy_to_mode_reg
        instead of force_reg.
        (sh_expand_setmem): Likewise.

--
diff --git a/config/sh/sh-mem.cc b/config/sh/sh-mem.cc
index b965aed..f91afa5 100644
--- a/config/sh/sh-mem.cc
+++ b/config/sh/sh-mem.cc
@@ -347,7 +347,7 @@ sh_expand_cmpnstr (rtx *operands)
   rtx_code_label *L_loop_byte = gen_label_rtx ();
   rtx_code_label *L_end_loop_byte = gen_label_rtx ();
 
-  rtx len = force_reg (SImode, operands[3]);
+  rtx len = copy_to_mode_reg (SImode, operands[3]);
   int constp = CONST_INT_P (operands[3]);
 
   const unsigned int addr1_alignment = MEM_ALIGN (operands[1]) / BITS_PER_UNIT;
@@ -672,9 +672,9 @@ sh_expand_setmem (rtx *operands)
   rtx_insn *jump;
   rtx dest = copy_rtx (operands[0]);
   rtx dest_addr = copy_addr_to_reg (XEXP (dest, 0));
-  rtx val = force_reg (SImode, operands[2]);
+  rtx val = copy_to_mode_reg (SImode, operands[2]);
   int align = INTVAL (operands[3]);
-  rtx len = force_reg (SImode, operands[1]);
+  rtx len = copy_to_mode_reg (SImode, operands[1]);
 
   if (! CONST_INT_P (operands[1]))
     return;