Herman S. bc37068f90 [x64] Fix AVX-512 VECTOR_DENORMFLUSH merge-masking & FpRangeSign values ...

Copy src1 into dest before the masked vrangeps so that unmasked lanes
(normal/inf/NaN values) are preserved via merge-masking. Previously,
when the register allocator assigned different physical registers for
dest and src1, unmasked lanes would retain stale values from dest.

Tested with Intel SDE and AVX-512 cpu to verify.

Also shift unused FpRangeSign constants into bits [3:2] of the vrangeps
immediate, matching the Intel encoding. Only one used in the code was 0
so it was already correct by accident but using the others in the future
would produce incorrect results.

2026-03-21 15:16:59 +09:00

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