[PATCH] D127858: [RISCV] Turn on SeparateConstOffsetFromGEPPass for RISC-V target

[Elena Lepilkina via Phabricator via llvm-commits]

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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127858

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


Index: llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
===================================================================
--- llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
+++ llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
@@ -34,6 +34,7 @@
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Scalar.h"
 using namespace llvm;
 
 static cl::opt<bool> EnableRedundantCopyElimination(
@@ -41,6 +42,11 @@
     cl::desc("Enable the redundant copy elimination pass"), cl::init(true),
     cl::Hidden);
 
+static cl::opt<bool>
+    EnableGEPOpt("riscv-enable-gep-opt", cl::Hidden,
+                 cl::desc("Enable optimizations on complex GEPs"),
+                 cl::init(true));
+
 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTarget() {
   RegisterTargetMachine<RISCVTargetMachine> X(getTheRISCV32Target());
   RegisterTargetMachine<RISCVTargetMachine> Y(getTheRISCV64Target());
@@ -167,7 +173,15 @@
   addPass(createAtomicExpandPass());
 
   addPass(createRISCVGatherScatterLoweringPass());
-
+  if (TM->getOptLevel() == CodeGenOpt::Aggressive && EnableGEPOpt) {
+    addPass(createSeparateConstOffsetFromGEPPass(false, true));
+    // Call EarlyCSE pass to find and remove subexpressions in the lowered
+    // result.
+    addPass(createEarlyCSEPass());
+    // Do loop invariant code motion in case part of the lowered result is
+    // invariant.
+    addPass(createLICMPass());
+  }
   TargetPassConfig::addIRPasses();
 }
 


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