[llvm] [ValueTracking][NFC]: Use injected condition to compute known FPClass (PR #139832)

[Hassnaa Hamdi via llvm-commits]

https://github.com/hassnaaHamdi created https://github.com/llvm/llvm-project/pull/139832

None

>From 5f193ede0a7d3945e00a9dd3b825702067db4471 Mon Sep 17 00:00:00 2001
From: Hassnaa Hamdi <hassnaa.hamdi at arm.com>
Date: Wed, 14 May 2025 03:50:01 +0000
Subject: [PATCH] [ValueTracking][NFC]: Use injected condition to compute known
 FPClass

---
 llvm/include/llvm/Analysis/SimplifyQuery.h | 2 ++
 llvm/lib/Analysis/ValueTracking.cpp        | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/llvm/include/llvm/Analysis/SimplifyQuery.h b/llvm/include/llvm/Analysis/SimplifyQuery.h
index e8f43c8c2e91f..063ca4eaa9db0 100644
--- a/llvm/include/llvm/Analysis/SimplifyQuery.h
+++ b/llvm/include/llvm/Analysis/SimplifyQuery.h
@@ -62,6 +62,8 @@ struct InstrInfoQuery {
 struct CondContext {
   Value *Cond;
   bool Invert = false;
+  // Condition is true if CxtI is in the true successor of Cond.
+  bool CondIsTrue = false;
   SmallPtrSet<Value *, 4> AffectedValues;
 
   CondContext(Value *Cond) : Cond(Cond) {}
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 3d403531cea2f..527e8c549c04f 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -5014,6 +5014,10 @@ static KnownFPClass computeKnownFPClassFromContext(const Value *V,
                                                    const SimplifyQuery &Q) {
   KnownFPClass KnownFromContext;
 
+  if (Q.CC && Q.CC->AffectedValues.contains(V))
+    computeKnownFPClassFromCond(V, Q.CC->Cond, 0, Q.CC->CondIsTrue,
+                                Q.CxtI, KnownFromContext);
+
   if (!Q.CxtI)
     return KnownFromContext;