From: Darius Galis <darius.galis@cyberthorstudios.com>
Date: Fri, 6 Nov 2020 18:54:20 +0000 (-0700)
Subject: Add PC as control register
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=25126a28dbea7f9c7d6e5365929d7f3c9f60cdaf;p=gcc.git

Add PC as control register

gcc/
	* config/rx/rx.md (CTRLREG_PC): Add.
	* config/rx/rx.c (CTRLREG_PC): Add
	(rx_expand_builtin_mvtc): Add warning: PC register cannot
	be used as dest.
---

diff --git a/gcc/config/rx/rx.c b/gcc/config/rx/rx.c
index 151ad39d9f0..dfb4bd42fe5 100644
--- a/gcc/config/rx/rx.c
+++ b/gcc/config/rx/rx.c
@@ -639,6 +639,7 @@ rx_print_operand (FILE * file, rtx op, int letter)
       switch (INTVAL (op))
 	{
 	case CTRLREG_PSW:   fprintf (file, "psw"); break;
+	case CTRLREG_PC:    fprintf (file, "pc"); break;
 	case CTRLREG_USP:   fprintf (file, "usp"); break;
 	case CTRLREG_FPSW:  fprintf (file, "fpsw"); break;
 	case CTRLREG_BPSW:  fprintf (file, "bpsw"); break;
@@ -2474,6 +2475,13 @@ rx_expand_builtin_mvtc (tree exp)
   if (! REG_P (arg2))
     arg2 = force_reg (SImode, arg2);
 
+  if (INTVAL (arg1) == 1)
+    {
+      warning (0, "invalid control register for mvtc : %d - using 'psw'",
+	       (int) INTVAL (arg1));
+      arg1 = const0_rtx;
+    }
+
   emit_insn (gen_mvtc (arg1, arg2));
 
   return NULL_RTX;
diff --git a/gcc/config/rx/rx.md b/gcc/config/rx/rx.md
index df08a9e5c3e..6e5c546f4db 100644
--- a/gcc/config/rx/rx.md
+++ b/gcc/config/rx/rx.md
@@ -77,6 +77,7 @@
    (UNSPEC_PID_ADDR	   52)
 
    (CTRLREG_PSW		    0)
+   (CTRLREG_PC		    1)
    (CTRLREG_USP		    2)
    (CTRLREG_FPSW	    3)
    (CTRLREG_BPSW	    8)