[LLVMdev] X86TargetLowering::LowerToBT

[Chris Sears]

The status quo is:

a) 40b REX+BT instruction for the 64b case
b) 48b TEST for the 32b case
c) unless it's small TEST


You are currently paying a 16b penalty for TEST vs BT in the 32b case.
That may be worth testing the -Os flag.
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