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_isbitset31
2015 Jan 23
2
[LLVMdev] X86TarIgetLowering::LowerToBT
> icc generates testq for 0-30 and btq for 31-63.
> That seems like a small bug in the bit 31 case.
You can’t use testq for bit 31, because the immediate gets sign-extended. You *can* use the 32b form, of course.