Displaying 1 result from an estimated 1 matches for "ef0da9ac".
2015 Jan 19
2
[LLVMdev] X86TargetLowering::LowerToBT
Which BTQ? There are three flavors.
BTQ reg/reg
BTQ reg/mem
BTQ reg/imm
I can imagine that the reg/reg and especially the reg/mem versions would be
slow. However the shrq/and versions *with the same operands* would be slow
as well. There's even a compiler comment about the reg/mem version saying
"this is for disassembly only".
But I doubt BTQ reg/imm would be microcoded.
--
Ite