[llvm] [SystemZ] Don't use FP Load and Test as comparisons to same reg (PR #78074)

[Ulrich Weigand via llvm-commits]

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@@ -9180,9 +9180,11 @@ MachineBasicBlock *SystemZTargetLowering::emitLoadAndTestCmp0(
   MachineRegisterInfo *MRI = &MF.getRegInfo();
   const SystemZInstrInfo *TII = Subtarget.getInstrInfo();
   DebugLoc DL = MI.getDebugLoc();
-
   Register SrcReg = MI.getOperand(0).getReg();
 
+  // This instruction will raise an exception if the input is a SNaN.
+  //  MI.clearFlag(MachineInstr::MIFlag::NoFPExcept);
+
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uweigand wrote:

Please remove the changes from this function.

https://github.com/llvm/llvm-project/pull/78074