re PR target/49263 (SH Target: underutilized "TST #imm, R0" instruction)

gcc/
	PR target/49263
	* config/sh/sh.c (sh_split_treg_set_expr): Invoke emit_insn before
	remove_insn.
	* config/sh/sh.md (tstsi_t): Don't try to optimize constant with right
	shifts if it already fits into K08.

gcc/testsuite/
	PR target/49263
	* gcc.target/sh/pr49263-4.c: New.

From-SVN: r220144

gcc/ChangeLog

+2015-01-26  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR target/49263
+	* config/sh/sh.c (sh_split_treg_set_expr): Invoke emit_insn before
+	remove_insn.
+	* config/sh/sh.md (tstsi_t): Don't try to optimize constant with right
+	shifts if it already fits into K08.
+
 2015-01-26  Jakub Jelinek  <jakub@redhat.com>
 
 	PR ipa/64730

gcc/config/sh/sh.c

@@ -14466,6 +14466,8 @@ sh_split_treg_set_expr (rtx x, rtx_insn* curr_insn)
 	fprintf (dump_file, "trailing nott insn %d\n", INSN_UID (nott_insn));
     }
 
+  emit_insn (insnlist.first);
+
   if (nott_insn != NULL && append_nott)
     {
       if (dump_file)
@@ -14475,8 +14477,6 @@ sh_split_treg_set_expr (rtx x, rtx_insn* curr_insn)
       append_nott = false;
     }
 
-  emit_insn (insnlist.first);
-
   if (append_nott)
     nott_insn = emit_insn (gen_nott (get_t_reg_rtx ()));
 

gcc/config/sh/sh.md

@@ -742,7 +742,11 @@
      variant instead and load the constant into a reg.  For that we'd need
      to do some analysis.  */
 
-  if ((op1val & 0xFFFF) == 0
+  if (CONST_OK_FOR_K08 (op1val))
+    {
+      /* Do nothing.  */
+    }
+  else if ((op1val & 0xFFFF) == 0
 	   && CONST_OK_FOR_K08 (op1val >> 16) && optimize_size)
     {
       /* Use a swap.w insn to do a shift + reg copy (to R0) in one insn.  */

gcc/testsuite/ChangeLog

+2015-01-26  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR target/49263
+	* gcc.target/sh/pr49263-4.c: New.
+
 2015-01-26  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/62044

gcc/testsuite/gcc.target/sh/pr49263-4.c

+/* Verify that TST #imm, R0 instruction is generated if the constant
+   allows it when compiling for -Os.  */
+/* { dg-do compile }  */
+/* { dg-options "-Os" } */
+/* { dg-final { scan-assembler-not "and" } } */
+/* { dg-final { scan-assembler-not "extu" } } */
+/* { dg-final { scan-assembler-not "exts" } } */
+/* { dg-final { scan-assembler-not "shlr" } } */
+
+#include "pr49263.c"