Add definition of DSBH (Double Swap Bytes within Halfwords) and

DSHD (Double Swap Halfwords within Doublewords). Add a pattern which replaces
64-bit bswap with a DSBH and DSHD pair.

llvm-svn: 147017

2 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/Target/Mips/Mips64InstrInfo.td b/llvm/lib/Target/Mips/Mips64InstrInfo.td
index 681c7ae1bce..f7994172c67 100644
--- a/llvm/lib/Target/Mips/Mips64InstrInfo.td
+++ b/llvm/lib/Target/Mips/Mips64InstrInfo.td
@@ -199,6 +199,10 @@ def MFLO64 : MoveFromLOHI<0x12, "mflo", CPU64Regs, [LO64]>;
 def DCLZ : CountLeading0<0x24, "dclz", CPU64Regs>;
 def DCLO : CountLeading1<0x25, "dclo", CPU64Regs>;
 
+/// Double Word Swap Bytes/HalfWords
+def DSBH : SubwordSwap<0x24, 0x2, "dsbh", CPU64Regs>;
+def DSHD : SubwordSwap<0x24, 0x5, "dshd", CPU64Regs>;
+
 def LEA_ADDiu64 : EffectiveAddress<"addiu\t$rt, $addr", CPU64Regs, mem_ea_64>;
 
 let Uses = [SP_64] in
@@ -316,3 +320,5 @@ def : Pat<(i64 (sext CPURegs:$src)), (SLL64_32 CPURegs:$src)>;
 // Sign extend in register
 def : Pat<(i64 (sext_inreg CPU64Regs:$src, i32)), (SLL64_64 CPU64Regs:$src)>;
 
+// bswap pattern
+def : Pat<(bswap CPU64Regs:$rt), (DSHD (DSBH CPU64Regs:$rt))>;
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp
index cfdce3a447f..d0ee632db74 100644
--- a/llvm/lib/Target/Mips/MipsISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp
@@ -221,8 +221,10 @@ MipsTargetLowering(MipsTargetMachine &TM)
   if (!Subtarget->hasBitCount())
     setOperationAction(ISD::CTLZ, MVT::i32, Expand);
 
-  if (!Subtarget->hasSwap())
+  if (!Subtarget->hasSwap()) {
     setOperationAction(ISD::BSWAP, MVT::i32, Expand);
+    setOperationAction(ISD::BSWAP, MVT::i64, Expand);
+  }
 
   setTargetDAGCombine(ISD::ADDE);
   setTargetDAGCombine(ISD::SUBE);