diff options
Diffstat (limited to 'llvm/lib/CodeGen/TypePromotion.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/TypePromotion.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/TypePromotion.cpp b/llvm/lib/CodeGen/TypePromotion.cpp index 8dc8d381ad16..a63118067139 100644 --- a/llvm/lib/CodeGen/TypePromotion.cpp +++ b/llvm/lib/CodeGen/TypePromotion.cpp @@ -569,7 +569,8 @@ void IRPromoter::TruncateSinks() { 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 + // 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; @@ -584,6 +585,11 @@ 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 |