Support the LLVM backend in HiPE

Add flags to enable and use the LLVM backend:
  * to_llvm: use the LLVM pipeline for compilation (default optimization level
  is O3),
  * llvm_save_temps: save the intermediate files in current directory in order
  to be able to debug or optimize the LLVM assembly,
  * {to_llvm, O}: set the optimization level of LLVM opt and llc tools.

Add some debug support to the loader; no semantic change intented.

1 files changed, 37 insertions, 16 deletions

diff --git a/lib/hipe/main/hipe.erl b/lib/hipe/main/hipe.erl
index 434d5c3061..d47eced6d8 100644
--- a/lib/hipe/main/hipe.erl
+++ b/lib/hipe/main/hipe.erl
@@ -821,7 +821,9 @@ finalize_fun_sequential({MFA, Icode}, Opts, Servers) ->
 		   ?debug_msg("Compiled ~w in ~.2f s\n", [MFA,(T2-T1)/1000])),
       {MFA, Code};
     {rtl, LinearRtl} ->
-      {MFA, LinearRtl}
+      {MFA, LinearRtl};
+    {llvm_binary, Binary} ->
+      {MFA, Binary}
   catch
     error:Error ->
       ?when_option(verbose, Opts, ?debug_untagged_msg("\n", [])),
@@ -890,21 +892,27 @@ do_load(Mod, Bin, BeamBinOrPath) when is_binary(BeamBinOrPath);
   end.
 
 assemble(CompiledCode, Closures, Exports, Options) ->
-  case get(hipe_target_arch) of
-    ultrasparc ->
-      hipe_sparc_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    powerpc ->
-      hipe_ppc_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    ppc64 ->
-      hipe_ppc_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    arm ->
-      hipe_arm_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    x86 ->
-      hipe_x86_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    amd64 ->
-      hipe_amd64_assemble:assemble(CompiledCode, Closures, Exports, Options);
-    Arch ->
-      ?EXIT({executing_on_an_unsupported_architecture, Arch})
+  case proplists:get_bool(to_llvm, Options) of
+    false ->
+      case get(hipe_target_arch) of
+        ultrasparc ->
+          hipe_sparc_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        powerpc ->
+          hipe_ppc_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        ppc64 ->
+          hipe_ppc_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        arm ->
+          hipe_arm_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        x86 ->
+          hipe_x86_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        amd64 ->
+          hipe_amd64_assemble:assemble(CompiledCode, Closures, Exports, Options);
+        Arch ->
+          ?EXIT({executing_on_an_unsupported_architecture, Arch})
+      end;
+    true ->
+      %% Merge already compiled code (per MFA) to a single binary.
+      hipe_llvm_merge:finalize(CompiledCode, Closures, Exports)
   end.
 
 %% --------------------------------------------------------------------
@@ -1330,6 +1338,11 @@ opt_keys() ->
      timeregalloc,
      timers,
      to_rtl,
+     to_llvm, % Use the LLVM backend for compilation.
+     llvm_save_temps, % Save the LLVM intermediate files in the current
+                      % directory; useful for debugging.
+     llvm_llc, % Specify llc optimization-level: o1, o2, o3, undefined.
+     llvm_opt, % Specify opt optimization-level: o1, o2, o3, undefined.
      use_indexing,
      use_inline_atom_search,
      use_callgraph,
@@ -1468,11 +1481,19 @@ opt_expansions() ->
   [{o1, o1_opts()},
    {o2, o2_opts()},
    {o3, o3_opts()},
+   {to_llvm, llvm_opts(o3)},
+   {{to_llvm, o0}, llvm_opts(o0)},
+   {{to_llvm, o1}, llvm_opts(o1)},
+   {{to_llvm, o2}, llvm_opts(o2)},
+   {{to_llvm, o3}, llvm_opts(o3)},
    {x87, [x87, inline_fp]},
    {inline_fp, case get(hipe_target_arch) of %% XXX: Temporary until x86
 		 x86 -> [x87, inline_fp];    %%       has sse2
 		 _ -> [inline_fp] end}].
 
+llvm_opts(O) ->
+  [to_llvm, {llvm_opt, O}, {llvm_llc, O}].
+
 %% This expands "basic" options, which may be tested early and cannot be
 %% in conflict with options found in the source code.