diff options
Diffstat (limited to 'llvm/lib/CodeGen/TypePromotion.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/TypePromotion.cpp | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/llvm/lib/CodeGen/TypePromotion.cpp b/llvm/lib/CodeGen/TypePromotion.cpp index a63118067139..36e3c1245f1c 100644 --- a/llvm/lib/CodeGen/TypePromotion.cpp +++ b/llvm/lib/CodeGen/TypePromotion.cpp @@ -570,7 +570,6 @@ void IRPromoter::Cleanup() { LLVM_DEBUG(dbgs() << "IR Promotion: Cleanup..\n"); // Some zexts will now have become redundant, along with their trunc // operands, so remove them. - // Some zexts need to be replaced with truncate if src bitwidth is larger. for (auto *V : Visited) { if (!isa<ZExtInst>(V)) continue; @@ -585,11 +584,6 @@ void IRPromoter::Cleanup() { << "\n"); ReplaceAllUsersOfWith(ZExt, Src); continue; - } else if (ZExt->getSrcTy()->getScalarSizeInBits() > PromotedWidth) { - IRBuilder<> Builder{ZExt}; - Value *Trunc = Builder.CreateTrunc(Src, ZExt->getDestTy()); - ReplaceAllUsersOfWith(ZExt, Trunc); - continue; } // We've inserted a trunc for a zext sink, but we already know that the @@ -626,6 +620,8 @@ void IRPromoter::ConvertTruncs() { ConstantInt *Mask = ConstantInt::get(SrcTy, APInt::getMaxValue(NumBits).getZExtValue()); Value *Masked = Builder.CreateAnd(Trunc->getOperand(0), Mask); + if (SrcTy != ExtTy) + Masked = Builder.CreateTrunc(Masked, ExtTy); if (auto *I = dyn_cast<Instruction>(Masked)) NewInsts.insert(I); |