re PR target/78426 (wrong code with strncmp on SH)

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

From-SVN: r242622

gcc/ChangeLog

+2016-11-19  Kaz Kojima  <kkojima@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.
+
 2016-11-19  Krister Walfridsson  <krister.walfridsson@gmail.com>
 
 	* config.gcc (*-*-netbsd): Set use_gcc_stdint=wrap.

gcc/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;