[PATCH] D26014: [ConstantFold] Get the correct vector type when folding a getelementptr instruction with vector indices
Davide Italiano via llvm-commits
llvm-commits at lists.llvm.org
Wed Oct 26 15:56:24 PDT 2016
davide updated this revision to Diff 75960.
davide added a comment.
Fixed typo, simplified test.
https://reviews.llvm.org/D26014
Files:
lib/IR/ConstantFold.cpp
test/Transforms/InstCombine/gep-vector.ll
Index: test/Transforms/InstCombine/gep-vector.ll
===================================================================
--- /dev/null
+++ test/Transforms/InstCombine/gep-vector.ll
@@ -0,0 +1,15 @@
+; RUN: opt -instcombine %s -S | FileCheck %s
+
+; CHECK-LABEL: patatino
+; CHECK-NEXT: ret void
+define <8 x i64*> @patatino() {
+ %el = getelementptr i64, <8 x i64*> undef, <8 x i64> undef
+ ret <8 x i64*> %el
+}
+
+; CHECK-LABEL: patatino2
+; CHECK-NEXT: ret void
+define <8 x i64*> @patatino2() {
+ %el = getelementptr inbounds i64, i64* undef, <8 x i64> undef
+ ret <8 x i64*> %el
+}
Index: lib/IR/ConstantFold.cpp
===================================================================
--- lib/IR/ConstantFold.cpp
+++ lib/IR/ConstantFold.cpp
@@ -2062,6 +2062,12 @@
Type *GEPTy = PointerType::get(Ty, PtrTy->getAddressSpace());
if (VectorType *VT = dyn_cast<VectorType>(C->getType()))
GEPTy = VectorType::get(GEPTy, VT->getNumElements());
+ // When the getelementptr has one or more vector indices, it will
+ // return a vector of pointers. We guarantee that all the vectors
+ // in this case will have the same width, so we can just look at
+ // the first one.
+ else if (VectorType *VT = dyn_cast<VectorType>(Idxs[0]->getType()))
+ GEPTy = VectorType::get(GEPTy, VT->getNumElements());
return UndefValue::get(GEPTy);
}
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