Lower level memcpy primop
I'm doing some really low-level buffer stuff, and it would be quite helpful if there were lower-level memcpy primitives.
I'm thinking something like:
copyBytes# :: Addr# -> Addr# -> Int# -> State# s -> State# s
copyBytes dst src size _ = ...I would expect it to compile, on x86, into "rep movsb", which is frequently optimal on Ivy Bridge and Haswell.
The other memcpy primitives use Array# or MutableArray#, and it's not clear how, if all you have is an Addr#, how to get the corresponding Array# or MutableArray#. (Can you just cast?)
It may be appropriate to have corresponding 16-bit and 32-bit operations; "rep movsw" and "rep movsd", respectively.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.8.4 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |