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On 11 May 2017 at 18:30, Michael Clark via llvm-dev <llvm-dev at lists.llvm.org> wrote: > I note that on your bug that you have stated that the branch is faster than > the conditional move. Faster code is a side effect of the fix in this > particular case. On the contrary: the faster code is pretty much the only reason this can happen before the rest of the FENV support lands.

I think it’s generally true that whenever branches can reliably be predicted branching is faster than a cmov that involves speculative execution, and I would guess that your assessment regarding looping on input values is probably correct. I believe the code that actually creates most of the transformation you’re interested in here is in SelectionDAGLegalize::ExpandNode() in LegalizeDAG.cpp. The

.................... = /var/cfengine/inputs/lib R: r1: sys.local_libdir ........... = lib R: r1: sys.logdir ................. = /var/cfengine R: r1: sys.license_owner .......... = $(sys.license_owner) R: r1: sys.licenses_granted ....... = $(sys.licenses_granted) R: r1: sys.long_arch .............. = linux_x86_64_3_10_0_693_el7_x86_64__1_SMP_Tue_Aug_22_21_09_27_UTC_2017 R: r1: sys.maildir ................ = /var/spool/mail R: r1: sys.masterdir .............. = /var/cfengine/masterfiles R: r1: sys.os ..................... = linux R: r1: sys.ostype ................. = linux_x86_64 R: r1: sys.piddir .............