[llvm] d5c130f - [ValueTracking] Added support to deduce PHI Nodes values being a power of 2

[William Huang via llvm-commits]

Author: William Huang
Date: 2022-05-19T18:39:13Z
New Revision: d5c130f17e503e128b8a413c2ce0e522987d2a16

URL: https://github.com/llvm/llvm-project/commit/d5c130f17e503e128b8a413c2ce0e522987d2a16
DIFF: https://github.com/llvm/llvm-project/commit/d5c130f17e503e128b8a413c2ce0e522987d2a16.diff

LOG: [ValueTracking] Added support to deduce PHI Nodes values being a power of 2

 Add Value Tracking support to deduce induction variable being a power of 2, allowing urem optimizations

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D125332

Added: 
    

Modified: 
    llvm/lib/Analysis/ValueTracking.cpp

Removed: 
    


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diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index a32633589c94a..60dbfaa64460c 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2128,6 +2128,25 @@ bool isKnownToBeAPowerOfTwo(const Value *V, bool OrZero, unsigned Depth,
     }
   }
 
+  // A PHI node is power of two if all incoming values are power of two.
+  if (const PHINode *PN = dyn_cast<PHINode>(V)) {
+    Query RecQ = Q;
+
+    // Recursively check all incoming values. Limit recursion to 2 levels, so
+    // that search complexity is limited to number of operands^2.
+    unsigned NewDepth = std::max(Depth, MaxAnalysisRecursionDepth - 1);
+    return llvm::all_of(PN->operands(), [&](const Use &U) {
+      // Value is power of 2 if it is coming from PHI node itself by induction.
+      if (U.get() == PN)
+        return true;
+
+      // Change the context instruction to the incoming block where it is
+      // evaluated.
+      RecQ.CxtI = PN->getIncomingBlock(U)->getTerminator();
+      return isKnownToBeAPowerOfTwo(U.get(), OrZero, NewDepth, RecQ);
+    });
+  }
+
   // An exact divide or right shift can only shift off zero bits, so the result
   // is a power of two only if the first operand is a power of two and not
   // copying a sign bit (sdiv int_min, 2).