[llvm] ae49bf5 - [RISCV] Fix stale comments in lowerShift*Parts. NFC

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2023-11-02T22:20:49-07:00
New Revision: ae49bf5a7bab332fb3a1362d70b325208de7d0ff

URL: https://github.com/llvm/llvm-project/commit/ae49bf5a7bab332fb3a1362d70b325208de7d0ff
DIFF: https://github.com/llvm/llvm-project/commit/ae49bf5a7bab332fb3a1362d70b325208de7d0ff.diff

LOG: [RISCV] Fix stale comments in lowerShift*Parts. NFC

This comment was not updated when we changed from xor back to sub.

Added: 
    

Modified: 
    llvm/lib/Target/RISCV/RISCVISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index ec5ae3e8f8d5419..3c7566e8c411ed1 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -7159,7 +7159,7 @@ SDValue RISCVTargetLowering::lowerShiftLeftParts(SDValue Op,
 
   // if Shamt-XLEN < 0: // Shamt < XLEN
   //   Lo = Lo << Shamt
-  //   Hi = (Hi << Shamt) | ((Lo >>u 1) >>u (XLEN-1 ^ Shamt))
+  //   Hi = (Hi << Shamt) | ((Lo >>u 1) >>u (XLEN-1 - Shamt))
   // else:
   //   Lo = 0
   //   Hi = Lo << (Shamt-XLEN)
@@ -7198,7 +7198,7 @@ SDValue RISCVTargetLowering::lowerShiftRightParts(SDValue Op, SelectionDAG &DAG,
 
   // SRA expansion:
   //   if Shamt-XLEN < 0: // Shamt < XLEN
-  //     Lo = (Lo >>u Shamt) | ((Hi << 1) << (ShAmt ^ XLEN-1))
+  //     Lo = (Lo >>u Shamt) | ((Hi << 1) << (XLEN-1 - ShAmt))
   //     Hi = Hi >>s Shamt
   //   else:
   //     Lo = Hi >>s (Shamt-XLEN);
@@ -7206,7 +7206,7 @@ SDValue RISCVTargetLowering::lowerShiftRightParts(SDValue Op, SelectionDAG &DAG,
   //
   // SRL expansion:
   //   if Shamt-XLEN < 0: // Shamt < XLEN
-  //     Lo = (Lo >>u Shamt) | ((Hi << 1) << (ShAmt ^ XLEN-1))
+  //     Lo = (Lo >>u Shamt) | ((Hi << 1) << (XLEN-1 - ShAmt))
   //     Hi = Hi >>u Shamt
   //   else:
   //     Lo = Hi >>u (Shamt-XLEN);