4 files changed, 20 insertions, 1 deletions
diff --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
index 9a6afa1..b25a054 100644
--- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
@@ -3995,6 +3995,7 @@ bool RISCVDAGToDAGISel::hasAllNBitUsers(SDNode *Node, unsigned Bits,
     case RISCV::CTZW:
     case RISCV::CPOPW:
     case RISCV::SLLI_UW:
+    case RISCV::ABSW:
     case RISCV::FMV_W_X:
     case RISCV::FCVT_H_W:
     case RISCV::FCVT_H_W_INX:
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 1c930ac..56881f7 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -433,6 +433,8 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
   if (Subtarget.hasStdExtP() ||
       (Subtarget.hasVendorXCValu() && !Subtarget.is64Bit())) {
     setOperationAction(ISD::ABS, XLenVT, Legal);
+    if (Subtarget.is64Bit())
+      setOperationAction(ISD::ABS, MVT::i32, Custom);
   } else if (Subtarget.hasShortForwardBranchOpt()) {
     // We can use PseudoCCSUB to implement ABS.
     setOperationAction(ISD::ABS, XLenVT, Legal);
@@ -14816,8 +14818,16 @@ void RISCVTargetLowering::ReplaceNodeResults(SDNode *N,
     assert(N->getValueType(0) == MVT::i32 && Subtarget.is64Bit() &&
            "Unexpected custom legalisation");
 
+    if (Subtarget.hasStdExtP()) {
+      SDValue Src =
+          DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i64, N->getOperand(0));
+      SDValue Abs = DAG.getNode(RISCVISD::ABSW, DL, MVT::i64, Src);
+      Results.push_back(DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, Abs));
+      return;
+    }
+
     if (Subtarget.hasStdExtZbb()) {
-      // Emit a special ABSW node that will be expanded to NEGW+MAX at isel.
+      // Emit a special node that will be expanded to NEGW+MAX at isel.
       // This allows us to remember that the result is sign extended. Expanding
       // to NEGW+MAX here requires a Freeze which breaks ComputeNumSignBits.
       SDValue Src = DAG.getNode(ISD::SIGN_EXTEND, DL, MVT::i64,
@@ -20290,6 +20300,7 @@ SDValue RISCVTargetLowering::PerformDAGCombine(SDNode *N,
 
     break;
   }
+  case RISCVISD::ABSW:
   case RISCVISD::CLZW:
   case RISCVISD::CTZW: {
     // Only the lower 32 bits of the first operand are read
@@ -21862,6 +21873,7 @@ unsigned RISCVTargetLowering::ComputeNumSignBitsForTargetNode(
   case RISCVISD::REMUW:
   case RISCVISD::ROLW:
   case RISCVISD::RORW:
+  case RISCVISD::ABSW:
   case RISCVISD::FCVT_W_RV64:
   case RISCVISD::FCVT_WU_RV64:
   case RISCVISD::STRICT_FCVT_W_RV64:
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoP.td b/llvm/lib/Target/RISCV/RISCVInstrInfoP.td
index cc085bb..4cbbba3 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoP.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoP.td
@@ -1461,5 +1461,10 @@ let Predicates = [HasStdExtP, IsRV32] in {
 // Codegen patterns
 //===----------------------------------------------------------------------===//
 
+def riscv_absw : RVSDNode<"ABSW", SDTIntUnaryOp>;
+
 let Predicates = [HasStdExtP] in
 def : PatGpr<abs, ABS>;
+
+let Predicates = [HasStdExtP, IsRV64] in
+def : PatGpr<riscv_absw, ABSW>;
diff --git a/llvm/lib/Target/RISCV/RISCVOptWInstrs.cpp b/llvm/lib/Target/RISCV/RISCVOptWInstrs.cpp
index d08115b..ea98cdb 100644
--- a/llvm/lib/Target/RISCV/RISCVOptWInstrs.cpp
+++ b/llvm/lib/Target/RISCV/RISCVOptWInstrs.cpp
@@ -172,6 +172,7 @@ static bool hasAllNBitUsers(const MachineInstr &OrigMI,
       case RISCV::CTZW:
       case RISCV::CPOPW:
       case RISCV::SLLI_UW:
+      case RISCV::ABSW:
       case RISCV::FMV_W_X:
       case RISCV::FCVT_H_W:
       case RISCV::FCVT_H_W_INX: