[PATCH] D137450: [RISCV] Support shift/rotate amount operands in isAllUsesReadW.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: mohammed-nurulhoque, reames, kito-cheng, frasercrmck, asb, luismarques.
Herald added subscribers: sunshaoce, VincentWu, StephenFan, vkmr, evandro, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, shiva0217, niosHD, sabuasal, simoncook, johnrusso, rbar, hiraditya, arichardson.
Herald added a project: All.
craig.topper requested review of this revision.
Herald added subscribers: pcwang-thead, eopXD, MaskRay.
Herald added a project: LLVM.

These operands use 6 bits.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137450

Files:
  llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp


Index: llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
===================================================================
--- llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
+++ llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
@@ -139,6 +139,22 @@
         Worklist.push_back(UserMI);
         break;
 
+      case RISCV::SLL:
+        // Operand 2 is the shift amount which uses 6 bits.
+        if (OpIdx == 2)
+          break;
+        Worklist.push_back(UserMI);
+        break;
+
+      case RISCV::SRA:
+      case RISCV::SRL:
+      case RISCV::ROL:
+      case RISCV::ROR:
+        // Operand 2 is the shift amount which uses 6 bits.
+        if (OpIdx == 2)
+          break;
+        return false;
+
       case RISCV::ADD_UW:
       case RISCV::SH1ADD_UW:
       case RISCV::SH2ADD_UW:
@@ -172,7 +188,6 @@
       case RISCV::AND:
       case RISCV::MUL:
       case RISCV::OR:
-      case RISCV::SLL:
       case RISCV::SUB:
       case RISCV::XOR:
       case RISCV::XORI:


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D137450.473297.patch
Type: text/x-patch
Size: 974 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20221104/6c4fa9b1/attachment.bin>