We currently return cost 2 for NEON REG to REG moves, which would be incorrect
for 64 bit moves. We currently don't have a pattern for this in the neon_move
alternatives because this is a bit of a special case. We would almost never
want it to use this r -> r pattern unless it really has no choice.
As such we add a new neon r -> r move pattern but also hide it from being used
to determine register preferences and also disparage it during LRA.
gcc/ChangeLog:
PR/target 88850
* config/arm/neon.md (*neon_mov<mode>): Add r -> r case.
gcc/testsuite/ChangeLog:
PR/target 88850
* gcc.target/arm/pr88850.c: New test.
From-SVN: r268612
