[InstSimplify] Check call for FMF instead of CtxI (llvm#71585)

This code was incorrectly checking that the CtxI has required FMF, but
the context instruction need not always be the instrinsic call.

Check that the intrinsic call has the required FMF.

Fixes PR71548.

Author: annamthomas

llvm/lib/Analysis/InstructionSimplify.cpp

@@ -6161,7 +6161,8 @@ static Value *simplifyLdexp(Value *Op0, Value *Op1, const SimplifyQuery &Q,
 }
 
 static Value *simplifyUnaryIntrinsic(Function *F, Value *Op0,
-                                     const SimplifyQuery &Q) {
+                                     const SimplifyQuery &Q,
+                                     const CallBase *Call) {
   // Idempotent functions return the same result when called repeatedly.
   Intrinsic::ID IID = F->getIntrinsicID();
   if (isIdempotent(IID))
@@ -6212,31 +6213,31 @@ static Value *simplifyUnaryIntrinsic(Function *F, Value *Op0,
   }
   case Intrinsic::exp:
     // exp(log(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         match(Op0, m_Intrinsic<Intrinsic::log>(m_Value(X))))
       return X;
     break;
   case Intrinsic::exp2:
     // exp2(log2(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         match(Op0, m_Intrinsic<Intrinsic::log2>(m_Value(X))))
       return X;
     break;
   case Intrinsic::exp10:
     // exp10(log10(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         match(Op0, m_Intrinsic<Intrinsic::log10>(m_Value(X))))
       return X;
     break;
   case Intrinsic::log:
     // log(exp(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         match(Op0, m_Intrinsic<Intrinsic::exp>(m_Value(X))))
       return X;
     break;
   case Intrinsic::log2:
     // log2(exp2(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         (match(Op0, m_Intrinsic<Intrinsic::exp2>(m_Value(X))) ||
          match(Op0,
                m_Intrinsic<Intrinsic::pow>(m_SpecificFP(2.0), m_Value(X)))))
@@ -6245,7 +6246,7 @@ static Value *simplifyUnaryIntrinsic(Function *F, Value *Op0,
   case Intrinsic::log10:
     // log10(pow(10.0, x)) -> x
     // log10(exp10(x)) -> x
-    if (Q.CxtI->hasAllowReassoc() &&
+    if (Call->hasAllowReassoc() &&
         (match(Op0, m_Intrinsic<Intrinsic::exp10>(m_Value(X))) ||
          match(Op0,
                m_Intrinsic<Intrinsic::pow>(m_SpecificFP(10.0), m_Value(X)))))
@@ -6346,7 +6347,8 @@ static Value *foldMinimumMaximumSharedOp(Intrinsic::ID IID, Value *Op0,
 }
 
 static Value *simplifyBinaryIntrinsic(Function *F, Value *Op0, Value *Op1,
-                                      const SimplifyQuery &Q) {
+                                      const SimplifyQuery &Q,
+                                      const CallBase *Call) {
   Intrinsic::ID IID = F->getIntrinsicID();
   Type *ReturnType = F->getReturnType();
   unsigned BitWidth = ReturnType->getScalarSizeInBits();
@@ -6606,20 +6608,19 @@ static Value *simplifyBinaryIntrinsic(Function *F, Value *Op0, Value *Op1,
     // float, if the ninf flag is set.
     const APFloat *C;
     if (match(Op1, m_APFloat(C)) &&
-        (C->isInfinity() || (isa<FPMathOperator>(Q.CxtI) &&
-                             Q.CxtI->hasNoInfs() && C->isLargest()))) {
+        (C->isInfinity() || (Call->hasNoInfs() && C->isLargest()))) {
       // minnum(X, -inf) -> -inf
       // maxnum(X, +inf) -> +inf
       // minimum(X, -inf) -> -inf if nnan
       // maximum(X, +inf) -> +inf if nnan
-      if (C->isNegative() == IsMin && (!PropagateNaN || Q.CxtI->hasNoNaNs()))
+      if (C->isNegative() == IsMin && (!PropagateNaN || Call->hasNoNaNs()))
         return ConstantFP::get(ReturnType, *C);
 
       // minnum(X, +inf) -> X if nnan
       // maxnum(X, -inf) -> X if nnan
       // minimum(X, +inf) -> X
       // maximum(X, -inf) -> X
-      if (C->isNegative() != IsMin && (PropagateNaN || Q.CxtI->hasNoNaNs()))
+      if (C->isNegative() != IsMin && (PropagateNaN || Call->hasNoNaNs()))
         return Op0;
     }
 
@@ -6678,10 +6679,10 @@ static Value *simplifyIntrinsic(CallBase *Call, Value *Callee,
   }
 
   if (NumOperands == 1)
-    return simplifyUnaryIntrinsic(F, Args[0], Q);
+    return simplifyUnaryIntrinsic(F, Args[0], Q, Call);
 
   if (NumOperands == 2)
-    return simplifyBinaryIntrinsic(F, Args[0], Args[1], Q);
+    return simplifyBinaryIntrinsic(F, Args[0], Args[1], Q, Call);
 
   // Handle intrinsics with 3 or more arguments.
   switch (IID) {