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NM callable only.
This routine can be used to efficiently move data from a source buffer to a
target buffer.
Syntax
I64 @64 @64 I32
HPFMOVEDATA (count, source_ptr, target_ptr, status);
Parameters
- count
64-bit signed integer by reference (required)
The count parameter allows the caller to specify the number of bytes to
move from the source buffer to the target buffer.
- source_ptr
64-bit pointer by value (required)
The source_ptr can be a 64-bit pointer to any valid object that the
calling process has access to. The buffer may be in the caller's stack,
heap, or obtained by opening a file with user mapped access
- target_ptr
64-bit pointer by value (required)
The target_ptr can be a 64-bi pointer to any valid object that the
calling proceThis intrinsic is especially useful when the source and
target buffers are overlapping. The HPFMOVEDATARTOL intrinsic is
typically used when the target buffer's address is to the right (larger)
of the source buffer's address. Moving the data from the right to the
left ensures that the data in the source buffer is copied to the target
buffer before it is overwritten itselfss has access to. The buffer may be
in the caller's stack, heap, or obtained by opening a file with user
mapped access.
- status
32-bit signed integer by reference (optional)
Returns the status of the HPFMOVEDATA call. If no errors or warnings are
encountered, status returns 32 bits of zero. If errors or warnings are
encountered, status is interpretted as two 16-bit fields. Bits
(0:16) comprise status.info. A negative value indicates an error
condition, and a positive value indicates a warning condition. Bits
(16:16) comprise status.subsys. The value represents the subsystem that
set the status information.
Operation Notes
When calling the HPFMOVEDATA intrinsic it is important to ensure that the
source and target buffers are not overlapping. The results of a HPFMOVEDATA
call when source and target buffers are overlapping are undefined. If source
and target buffers are overlapping, the HPFMOVEDATALTOR or HPFMOVEDATARTOL
intrinsics should be used.
Related Information
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