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Zero register, i.e. xzr, can be used directly to zero FP register. TODO: FMOV from ZR may be slow on some cores and the preferred instructio is MOVI with immediate zero [1]. However, MOVI is not recoginized by DynASM/arm64. [1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=523d72071960 Change-Id: I0eaee4445e05adb45c6bb80ddb62ea02cdc9f4db