R600/SI: Add pattern to simplify i64 loading

This is a candidate for the stable branch.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 175356

llvm/lib/Target/R600/SIInstrInfo.td

@@ -40,6 +40,10 @@ def IMM12bit : ImmLeaf <
   [{return isUInt<12>(Imm);}]
 >;
 
+class InlineImm <ValueType vt> : ImmLeaf <vt, [{
+  return -16 <= Imm && Imm <= 64;
+}]>;
+
 class InstSI <dag outs, dag ins, string asm, list<dag> pattern> :
     AMDGPUInst<outs, ins, asm, pattern> {
 

llvm/lib/Target/R600/SIInstructions.td

@@ -1292,6 +1292,11 @@ def : Pat <
   (S_MOV_B32 fpimm:$imm)
 >;
 
+def : Pat <
+  (i64 InlineImm<i64>:$imm),
+  (S_MOV_B64 InlineImm<i64>:$imm)
+>;
+
 // i64 immediates aren't supported in hardware, split it into two 32bit values
 def : Pat <
   (i64 imm:$imm),