[AMDGPU] Assembler: Fix VOP3 only instructions

Separate methods to convert parsed instructions to MCInst:

  - VOP3 only instructions (always create modifiers as operands in MCInst)
  - VOP2 instrunctions with modifiers (create modifiers as operands
    in MCInst when e64 encoding is forced or modifiers are parsed)
  - VOP2 instructions without modifiers (do not create modifiers
    as operands in MCInst)
  - Add VOP3Only flag. Pass HasMods flag to VOP3Common.
  - Simplify code that deals with modifiers (-1 is now same as
    0). This is no longer needed.
  - Add few tests (more will be added separately).
    Update error message now correct.

Patch By: Nikolay Haustov

Differential Revision: http://reviews.llvm.org/D16778

llvm-svn: 260483

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIInstrFormats.td b/llvm/lib/Target/AMDGPU/SIInstrFormats.td
index 0e883f64caa..08e9c16a7ed 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrFormats.td
+++ b/llvm/lib/Target/AMDGPU/SIInstrFormats.td
@@ -123,7 +123,7 @@ class VOP2Common <dag outs, dag ins, string asm, list<dag> pattern> :
   let Size = 4;
 }
 
-class VOP3Common <dag outs, dag ins, string asm, list<dag> pattern> :
+class VOP3Common <dag outs, dag ins, string asm, list<dag> pattern, bit HasMods = 0, bit VOP3Only = 0> :
     VOPAnyCommon <outs, ins, asm, pattern> {
 
   // Using complex patterns gives VOP3 patterns a very high complexity rating,
@@ -135,7 +135,10 @@ class VOP3Common <dag outs, dag ins, string asm, list<dag> pattern> :
   let VOP3 = 1;
   let VALU = 1;
 
-  let AsmMatchConverter = "cvtVOP3";
+  let AsmMatchConverter =
+    !if(!eq(VOP3Only,1),
+        "cvtVOP3_only",
+        !if(!eq(HasMods,1), "cvtVOP3_2_mod", "cvtVOP3_2_nomod"));
   let isCodeGenOnly = 0;
 
   int Size = 8;