[PATCH] D38792: Fix float literals under XO & fp-armv8

[Christof Douma via Phabricator via llvm-commits]

christof created this revision.
Herald added subscribers: kristof.beyls, javed.absar, aemerson.

When targeting execute-only and fp-armv8, float constants in a compare resulted
in instruction selection failures in some cases. This is now fixed by using
vmov.f32 where possible, otherwise the floating point constant is lowered into
a integer constant that is moved into a floating point register.

This patch also restores using fpcmp with immediate 0 when fp-armv8 is specified.


Repository:
  rL LLVM

https://reviews.llvm.org/D38792

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/ARM/ARMInstrVFP.td
  test/CodeGen/ARM/fcmp-xo.ll

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