[PATCH] D157062: [ValueTracking] Improve the coverage of isKnownToBeAPowerOfTwo for vscale

[Allen zhong via Phabricator via llvm-commits]

This revision was not accepted when it landed; it landed in state "Needs Review".
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG9c837b7d0e2e: [ValueTracking] Improve the coverage of isKnownToBeAPowerOfTwo for vscale (authored by Allen).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157062/new/

https://reviews.llvm.org/D157062

Files:
  llvm/lib/Analysis/ValueTracking.cpp


Index: llvm/lib/Analysis/ValueTracking.cpp
===================================================================
--- llvm/lib/Analysis/ValueTracking.cpp
+++ llvm/lib/Analysis/ValueTracking.cpp
@@ -2018,7 +2018,8 @@
       return true;
   if (match(V, m_Power2()))
       return true;
-  if (Q.CxtI && match(V, m_VScale())) {
+  if (Q.CxtI &&
+      (match(V, m_VScale()) || match(V, m_Shl(m_VScale(), m_Value())))) {
     const Function *F = Q.CxtI->getFunction();
     // The vscale_range indicates vscale is a power-of-two.
     return F->hasFnAttribute(Attribute::VScaleRange);


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