[llvm] ceb3cdc - [SLP] remove dead code in reduction matching; NFC

[Sanjay Patel via llvm-commits]

Author: Sanjay Patel
Date: 2021-01-15T17:03:26-05:00
New Revision: ceb3cdccd0fb597659147e0f538fdee91414541e

URL: https://github.com/llvm/llvm-project/commit/ceb3cdccd0fb597659147e0f538fdee91414541e
DIFF: https://github.com/llvm/llvm-project/commit/ceb3cdccd0fb597659147e0f538fdee91414541e.diff

LOG: [SLP] remove dead code in reduction matching; NFC

To get into this block we had: !A || B || C
and we checked C in the first 'if' clause
leaving !A || B. But the 2nd 'if' is checking:
A && !B --> !(!A || B)

Added: 
    

Modified: 
    llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index e1befc449492..cf7c05e30d06 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -6877,12 +6877,6 @@ class HorizontalReduction {
             markExtraArg(Stack.back(), I);
             continue;
           }
-        } else if (RdxLeafVal && RdxLeafVal != EdgeOpData) {
-          // Make sure that the opcodes of the operations that we are going to
-          // reduce match.
-          // I is an extra argument for TreeN (its parent operation).
-          markExtraArg(Stack.back(), I);
-          continue;
         } else if (!RdxLeafVal) {
           RdxLeafVal = EdgeOpData;
         }