[PATCH v2] genopinit: Allow more than 256 modes.

[Robin Dapp <rdapp.gcc@gmail.com>]

Attached is v2 that does not switch to uint64_t but stays within
32 bits by shifting the optab by 20 and the mode(s) by 10 bits.

Regards
 Robin

Upcoming changes for RISC-V will have us exceed 255 modes or 8 bits.
This patch increases the limit to 10 bits and adjusts the hashing
function for the gen* and optabs-query lookups accordingly.
Consequently, the number of optabs is limited to 4095.

gcc/ChangeLog:

	* genopinit.cc (main): Adjust maximal number of optabs and
	machine modes.
	* gensupport.cc (find_optab): Shift optab by 20 and mode by
	10 bits.
	* optabs-query.h (optab_handler): Ditto.
	(convert_optab_handler): Ditto.
---
 gcc/genopinit.cc   | 5 ++---
 gcc/gensupport.cc  | 2 +-
 gcc/optabs-query.h | 4 ++--
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/gcc/genopinit.cc b/gcc/genopinit.cc
index 6bd8858a1d9..2a841006884 100644
--- a/gcc/genopinit.cc
+++ b/gcc/genopinit.cc
@@ -182,8 +182,7 @@ main (int argc, const char **argv)
 
   progname = "genopinit";
 
-  if (NUM_OPTABS > 0xffff
-    || MAX_MACHINE_MODE >= ((1 << MACHINE_MODE_BITSIZE) - 1))
+  if (NUM_OPTABS > 0xfff || NUM_MACHINE_MODES > 0x3ff)
     fatal ("genopinit range assumptions invalid");
 
   if (!init_rtx_reader_args_cb (argc, argv, handle_arg))
@@ -439,7 +438,7 @@ main (int argc, const char **argv)
 	   "bool\n"
 	   "swap_optab_enable (optab op, machine_mode m, bool set)\n"
 	   "{\n"
-	   "  unsigned scode = (op << 16) | m;\n"
+	   "  unsigned scode = (op << 20) | m;\n"
 	   "  int i = lookup_handler (scode);\n"
 	   "  if (i >= 0)\n"
 	   "    {\n"
diff --git a/gcc/gensupport.cc b/gcc/gensupport.cc
index e39e6dacce2..959d1d9c83c 100644
--- a/gcc/gensupport.cc
+++ b/gcc/gensupport.cc
@@ -3806,7 +3806,7 @@ find_optab (optab_pattern *p, const char *name)
 	{
 	  p->name = name;
 	  p->op = optabs[pindex].op;
-	  p->sort_num = (p->op << 16) | (p->m2 << 8) | p->m1;
+	  p->sort_num = (p->op << 20) | (p->m2 << 10) | p->m1;
 	  return true;
 	}
     }
diff --git a/gcc/optabs-query.h b/gcc/optabs-query.h
index 043e9791bc1..920eb6a1b67 100644
--- a/gcc/optabs-query.h
+++ b/gcc/optabs-query.h
@@ -37,7 +37,7 @@ convert_optab_p (optab op)
 inline enum insn_code
 optab_handler (optab op, machine_mode mode)
 {
-  unsigned scode = (op << 16) | mode;
+  unsigned scode = (op << 20) | mode;
   gcc_assert (op > LAST_CONV_OPTAB);
   return raw_optab_handler (scode);
 }
@@ -50,7 +50,7 @@ inline enum insn_code
 convert_optab_handler (convert_optab op, machine_mode to_mode,
 		       machine_mode from_mode)
 {
-  unsigned scode = (op << 16) | (from_mode << 8) | to_mode;
+  unsigned scode = (op << 20) | (from_mode << 10) | to_mode;
   gcc_assert (convert_optab_p (op));
   return raw_optab_handler (scode);
 }
-- 
2.41.0