[PATCH] D149186: ValueTracking: Fix InterestedClasses logic for fadd/fsub

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: jcranmer-intel, kpn, andrew.w.kaylor, foad.
Herald added subscribers: StephenFan, hiraditya.
Herald added a project: All.
arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

This was early exiting for -0 queries.


https://reviews.llvm.org/D149186

Files:
  llvm/lib/Analysis/ValueTracking.cpp


Index: llvm/lib/Analysis/ValueTracking.cpp
===================================================================
--- llvm/lib/Analysis/ValueTracking.cpp
+++ llvm/lib/Analysis/ValueTracking.cpp
@@ -4616,8 +4616,9 @@
         Op->getOpcode() == Instruction::FAdd &&
         (InterestedClasses & (fcNegative & ~fcNegZero)) != fcNone;
     bool WantNaN = (InterestedClasses & fcNan) != fcNone;
+    bool WantNegZero = (InterestedClasses & fcNegZero) != fcNone;
 
-    if (!WantNaN && !WantNegative)
+    if (!WantNaN && !WantNegative && !WantNegZero)
       break;
 
     computeKnownFPClass(Op->getOperand(1), DemandedElts, fcNan | fcInf,


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