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Hao Sun e7be7f3f6c JIT/AArch64: Use ZR directly to zero FP register (#7081)
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
2021-05-31 16:47:26 +08:00
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