[llvm] 7474869 - [SVE] Fix bad FixedVectorType cast in simplifyDivRem

[Christopher Tetreault via llvm-commits]

Author: Christopher Tetreault
Date: 2020-06-16T13:17:05-07:00
New Revision: 747486991cc452f7a1861e4a7a30d069d5f34aab

URL: https://github.com/llvm/llvm-project/commit/747486991cc452f7a1861e4a7a30d069d5f34aab
DIFF: https://github.com/llvm/llvm-project/commit/747486991cc452f7a1861e4a7a30d069d5f34aab.diff

LOG: [SVE] Fix bad FixedVectorType cast in simplifyDivRem

Summary:
simplifyDivRem attempts to walk a VectorType elementwise. Ensure that it
only does so for FixedVectorType

Reviewers: efriedma, spatel, lebedev.ri, david-arm, kmclaughlin

Reviewed By: spatel, david-arm

Subscribers: tschuett, hiraditya, rkruppe, psnobl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81856

Added: 
    

Modified: 
    llvm/lib/Analysis/InstructionSimplify.cpp

Removed: 
    


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diff  --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 63f545306630..02d945beabab 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -942,10 +942,10 @@ static Value *simplifyDivRem(Value *Op0, Value *Op1, bool IsDiv) {
   if (match(Op1, m_Zero()))
     return UndefValue::get(Ty);
 
-  // If any element of a constant divisor vector is zero or undef, the whole op
-  // is undef.
+  // If any element of a constant divisor fixed width vector is zero or undef,
+  // the whole op is undef.
   auto *Op1C = dyn_cast<Constant>(Op1);
-  auto *VTy = dyn_cast<VectorType>(Ty);
+  auto *VTy = dyn_cast<FixedVectorType>(Ty);
   if (Op1C && VTy) {
     unsigned NumElts = VTy->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {