[llvm-commits] [llvm] r170663 - in /llvm/trunk/lib/Target/Mips: MipsInstrFormats.td MipsInstrInfo.td

[Akira Hatanaka]

Author: ahatanak
Date: Wed Dec 19 22:22:39 2012
New Revision: 170663

URL: http://llvm.org/viewvc/llvm-project?rev=170663&view=rev
Log:
[mips] Refactor unconditional branch instruction. Separate encoding information
from the rest. 


Modified:
    llvm/trunk/lib/Target/Mips/MipsInstrFormats.td
    llvm/trunk/lib/Target/Mips/MipsInstrInfo.td

Modified: llvm/trunk/lib/Target/Mips/MipsInstrFormats.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsInstrFormats.td?rev=170663&r1=170662&r2=170663&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsInstrFormats.td (original)
+++ llvm/trunk/lib/Target/Mips/MipsInstrFormats.td Wed Dec 19 22:22:39 2012
@@ -279,6 +279,17 @@
   let Inst{15-0}  = offset;
 }
 
+class B_FM {
+  bits<16> offset;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = 4;
+  let Inst{25-21} = 0;
+  let Inst{20-16} = 0;
+  let Inst{15-0}  = offset;
+}
+
 //===----------------------------------------------------------------------===//
 //
 //  FLOATING POINT INSTRUCTION FORMATS

Modified: llvm/trunk/lib/Target/Mips/MipsInstrInfo.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsInstrInfo.td?rev=170663&r1=170662&r2=170663&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsInstrInfo.td (original)
+++ llvm/trunk/lib/Target/Mips/MipsInstrInfo.td Wed Dec 19 22:22:39 2012
@@ -596,11 +596,9 @@
 }
 
 // Unconditional branch
-class UncondBranch<bits<6> op, string instr_asm>:
-  BranchBase<op, (outs), (ins brtarget:$imm16),
-             !strconcat(instr_asm, "\t$imm16"), [(br bb:$imm16)], IIBranch> {
-  let rs = 0;
-  let rt = 0;
+class UncondBranch<string opstr> :
+  InstSE<(outs), (ins brtarget:$offset), !strconcat(opstr, "\t$offset"),
+         [(br bb:$offset)], IIBranch, FrmI> {
   let isBranch = 1;
   let isTerminator = 1;
   let isBarrier = 1;
@@ -979,7 +977,7 @@
 def J       : JumpFJ<0x02, jmptarget, "j", br, bb>,
               Requires<[RelocStatic, HasStdEnc]>, IsBranch;
 def JR      : IndirectBranch<CPURegs>;
-def B       : UncondBranch<0x04, "b">;
+def B       : UncondBranch<"b">, B_FM;
 def BEQ     : CBranch<"beq", seteq, CPURegs>, BEQ_FM<4>;
 def BNE     : CBranch<"bne", setne, CPURegs>, BEQ_FM<5>;
 def BGEZ    : CBranchZero<"bgez", setge, CPURegs>, BGEZ_FM<1, 1>;