* h8300.c (get_shift_alg): Add special cases for shifts of 8 and 24.

From-SVN: r20396

gcc/ChangeLog

+Wed Jun 10 01:39:00 1998  Juha Sarlin <juha@c3l.tyreso.se> 
+
+	* h8300.c (get_shift_alg): Add special cases for shifts of 8 and 24.
+
 Tue Jun  9 22:05:34 1998  Richard Henderson  <rth@cygnus.com>
 
 	* fold-const.c (fold): Even with otherwise constant trees, look for

gcc/config/h8300/h8300.c

 /* Subroutines for insn-output.c for Hitachi H8/300.
-   Copyright (C) 1992, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1992, 93, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
    Contributed by Steve Chamberlain (sac@cygnus.com),
    Jim Wilson (wilson@cygnus.com), and Doug Evans (dje@cygnus.com).
 
@@ -2378,6 +2378,24 @@ get_shift_alg (cpu, shift_type, mode, count, assembler_p,
 	      return SHIFT_SPECIAL;
 	    }
 	}
+      else if (count == 8 && !TARGET_H8300)
+	{
+	  switch (shift_type)
+	    {
+	    case SHIFT_ASHIFT:
+	      *assembler_p = "mov.w\t%e0,%f4\n\tmov.b\t%s4,%t4\n\tmov.b\t%t0,%s4\n\tmov.b\t%s0,%t0\n\tsub.b\t%s0,%s0\n\tmov.w\t%f4,%e0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    case SHIFT_LSHIFTRT:
+	      *assembler_p = "mov.w\t%e0,%f4\n\tmov.b\t%t0,%s0\n\tmov.b\t%s4,%t0\n\tmov.b\t%t4,%s4\n\textu.w\t%f4\n\tmov.w\t%f4,%e0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    case SHIFT_ASHIFTRT:
+	      *assembler_p = "mov.w\t%e0,%f4\n\tmov.b\t%t0,%s0\n\tmov.b\t%s4,%t0\n\tmov.b\t%t4,%s4\n\texts.w\t%f4\n\tmov.w\t%f4,%e0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    }
+	}
       else if (count == 16)
 	{
 	  switch (shift_type)
@@ -2489,6 +2507,24 @@ get_shift_alg (cpu, shift_type, mode, count, assembler_p,
 	      return SHIFT_SPECIAL;
 	    }
 	}
+      else if (count == 24 && !TARGET_H8300)
+	{
+	  switch (shift_type)
+	    {
+	    case SHIFT_ASHIFT:
+	      *assembler_p = "mov.b\t%s0,%t0\n\tsub.b\t%s0,%s0\n\tmov.w\t%f0,%e0\n\tsub.w\t%f0,%f0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    case SHIFT_LSHIFTRT:
+	      *assembler_p = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\textu.w\t%f0\n\textu.l\t%S0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    case SHIFT_ASHIFTRT:
+	      *assembler_p = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\texts.w\t%f0\n\texts.l\t%S0";
+	      *cc_valid_p = 0;
+	      return SHIFT_SPECIAL;
+	    }
+	}
       else if (count >= 28 && count <= 30 && !TARGET_H8300)
 	{
 	  if (shift_type == SHIFT_ASHIFTRT)