Feature request: Add index/read/write primops with byte offset for ByteArray#
Currently, primops for indexing ByteArray#
and reading/writing MutableByteArray#
have the following form:
indexTYPEArray# :: ByteArray# -> Int# -> TYPE#
readTYPEArray# :: MutableByteArray# s -> Int# -> State# s -> (#State# s, TYPE##)
writeTYPEArray# :: MutableByteArray# s -> Int# -> TYPE# -> State# s -> State# s
where second argument of type Int#
is an offset measured in terms of the size of TYPE#
.
This is inconvinient if I want to store values of different types inside ByteArray#
: I have to read values of type Int8
and then glue them together with some bitwise operations.
I suggest adding number of primops, similar to existing ones, which would accept offset in bytes from the start of the ByteArray#
:
-- | Read 8-bit integer; offset in bytes.
indexByteInt8Array# :: ByteArray# -> Int# -> Int#
-- | Read 16-bit integer; offset in bytes.
indexByteInt16Array# :: ByteArray# -> Int# -> Int#
-- | Read 32-bit integer; offset in bytes.
indexByteInt32Array# :: ByteArray# -> Int# -> Int#
-- | Read 8-bit integer; offset in bytes.
readInt8Array# :: MutableByteArray# s -> Int# -> State# s -> (#State# s, Int##)
-- | Read 16-bit integer; offset in bytes.
readInt16Array# :: MutableByteArray# s -> Int# -> State# s -> (#State# s, Int##)
-- | Read 32-bit integer; offset in bytes.
readInt32Array# :: MutableByteArray# s -> Int# -> State# s -> (#State# s, Int##)
and so on...
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.2 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |