[PPC] In PPCBoolRetToInt change the bool value to i64 if the target is ppc64

In PPCBoolRetToInt bool value is changed to i32 type. On ppc64 it may introduce an extra zero extension for the return value. This patch changes the integer type to i64 to avoid the zero extension on ppc64.

This patch fixed PR32442.

Differential Revision: https://reviews.llvm.org/D31407

llvm-svn: 305001

1 files changed, 26 insertions, 12 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCBoolRetToInt.cpp b/llvm/lib/Target/PowerPC/PPCBoolRetToInt.cpp
index 4f4a2967d4b..55e105dad0e 100644
--- a/llvm/lib/Target/PowerPC/PPCBoolRetToInt.cpp
+++ b/llvm/lib/Target/PowerPC/PPCBoolRetToInt.cpp
@@ -7,15 +7,15 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements converting i1 values to i32 if they could be more
+// This file implements converting i1 values to i32/i64 if they could be more
 // profitably allocated as GPRs rather than CRs. This pass will become totally
 // unnecessary if Register Bank Allocation and Global Instruction Selection ever
 // go upstream.
 //
-// Presently, the pass converts i1 Constants, and Arguments to i32 if the
+// Presently, the pass converts i1 Constants, and Arguments to i32/i64 if the
 // transitive closure of their uses includes only PHINodes, CallInsts, and
 // ReturnInsts. The rational is that arguments are generally passed and returned
-// in GPRs rather than CRs, so casting them to i32 at the LLVM IR level will
+// in GPRs rather than CRs, so casting them to i32/i64 at the LLVM IR level will
 // actually save casts at the Machine Instruction level.
 //
 // It might be useful to expand this pass to add bit-wise operations to the list
@@ -33,6 +33,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "PPC.h"
+#include "PPCTargetMachine.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
@@ -51,6 +52,7 @@
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
 #include "llvm/Pass.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/Support/Casting.h"
 #include <cassert>
 
@@ -87,17 +89,19 @@ class PPCBoolRetToInt : public FunctionPass {
     return Defs;
   }
 
-  // Translate a i1 value to an equivalent i32 value:
-  static Value *translate(Value *V) {
-    Type *Int32Ty = Type::getInt32Ty(V->getContext());
+  // Translate a i1 value to an equivalent i32/i64 value:
+  Value *translate(Value *V) {
+    Type *IntTy = ST->isPPC64() ? Type::getInt64Ty(V->getContext())
+                                : Type::getInt32Ty(V->getContext());
+
     if (auto *C = dyn_cast<Constant>(V))
-      return ConstantExpr::getZExt(C, Int32Ty);
+      return ConstantExpr::getZExt(C, IntTy);
     if (auto *P = dyn_cast<PHINode>(V)) {
       // Temporarily set the operands to 0. We'll fix this later in
       // runOnUse.
-      Value *Zero = Constant::getNullValue(Int32Ty);
+      Value *Zero = Constant::getNullValue(IntTy);
       PHINode *Q =
-        PHINode::Create(Int32Ty, P->getNumIncomingValues(), P->getName(), P);
+        PHINode::Create(IntTy, P->getNumIncomingValues(), P->getName(), P);
       for (unsigned i = 0; i < P->getNumOperands(); ++i)
         Q->addIncoming(Zero, P->getIncomingBlock(i));
       return Q;
@@ -109,7 +113,7 @@ class PPCBoolRetToInt : public FunctionPass {
 
     auto InstPt =
       A ? &*A->getParent()->getEntryBlock().begin() : I->getNextNode();
-    return new ZExtInst(V, Int32Ty, "", InstPt);
+    return new ZExtInst(V, IntTy, "", InstPt);
   }
 
   typedef SmallPtrSet<const PHINode *, 8> PHINodeSet;
@@ -185,6 +189,13 @@ class PPCBoolRetToInt : public FunctionPass {
     if (skipFunction(F))
       return false;
 
+    auto *TPC = getAnalysisIfAvailable<TargetPassConfig>();
+    if (!TPC)
+      return false;
+
+    auto &TM = TPC->getTM<PPCTargetMachine>();
+    ST = TM.getSubtargetImpl(F);
+
     PHINodeSet PromotablePHINodes = getPromotablePHINodes(F);
     B2IMap Bool2IntMap;
     bool Changed = false;
@@ -205,7 +216,7 @@ class PPCBoolRetToInt : public FunctionPass {
     return Changed;
   }
 
-  static bool runOnUse(Use &U, const PHINodeSet &PromotablePHINodes,
+  bool runOnUse(Use &U, const PHINodeSet &PromotablePHINodes,
                        B2IMap &BoolToIntMap) {
     auto Defs = findAllDefs(U);
 
@@ -262,13 +273,16 @@ class PPCBoolRetToInt : public FunctionPass {
     AU.addPreserved<DominatorTreeWrapperPass>();
     FunctionPass::getAnalysisUsage(AU);
   }
+
+private:
+  const PPCSubtarget *ST;
 };
 
 } // end anonymous namespace
 
 char PPCBoolRetToInt::ID = 0;
 INITIALIZE_PASS(PPCBoolRetToInt, "bool-ret-to-int",
-                "Convert i1 constants to i32 if they are returned",
+                "Convert i1 constants to i32/i64 if they are returned",
                 false, false)
 
 FunctionPass *llvm::createPPCBoolRetToIntPass() { return new PPCBoolRetToInt(); }