[llvm-dev] Question on Instruction Combining

[Sain-Zee Ueng via llvm-dev]

Hello,

In InstructionCombining.cpp, under AddReachableCodeToWorklist
<http://llvm.org/docs/doxygen/html/InstructionCombining_8cpp.html#a65beadbfc094f4040b353518b98d0c07>,
DCE and ConstFold are performed but MadeIRChange is not set to true (lines
2912 and 2924). Is there some underlying assumption that supports this?

Intuitively not setting MadeIRChanges to true at these points could allow
Instruction Combining to exit early while there is still work to do.

Thank you,
Sain
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