[llvm] Fix misprint in computeKnownFPClass in GISelValueTracking.cpp (PR #171566)

[Matt Arsenault via llvm-commits]

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@@ -726,6 +726,31 @@ TEST_F(AArch64GISelMITest, TestFPClassFAdd) {
   EXPECT_EQ(std::nullopt, Known.SignBit);
 }
 
+TEST_F(AArch64GISelMITest, TestFPClassFAdd_Zero) {
+  StringRef MIRString = R"(
+    %ptr:_(p0) = G_IMPLICIT_DEF
+    %lhs:_(s32) = G_LOAD %ptr(p0) :: (load (s32))    
+    %rhs:_(s32) = G_FCONSTANT float 0.0
+    %fadd:_(s32) = G_FADD %lhs, %rhs
+    %copy_fadd:_(s32) = COPY %fadd
+)";
+
+  setUp(MIRString);
+  if (!TM)
+    GTEST_SKIP();
+
+  Register CopyReg = Copies[Copies.size() - 1];
+  MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
+  Register SrcReg = FinalCopy->getOperand(1).getReg();
+
+  GISelValueTracking Info(*MF);
+
+  KnownFPClass Known = Info.computeKnownFPClass(SrcReg);
+
+  EXPECT_EQ(fcAllFlags & ~fcNegZero, Known.KnownFPClasses);
+  EXPECT_EQ(std::nullopt, Known.SignBit);
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arsenm wrote:

Yes 

https://github.com/llvm/llvm-project/pull/171566