path: root/configure
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authorRich Felker <>2013-08-28 03:34:57 -0400
committerRich Felker <>2013-08-28 03:34:57 -0400
commit90edf1cc15cec685c18ec2485ddce5b655963464 (patch)
tree97b728abcd94fbb0e41a2a1d14a7a15d70b24c36 /configure
parent38e6acbf89afd3dfabb4f4d0506319c339b13663 (diff)
optimized C memcpy
unlike the old C memcpy, this version handles word-at-a-time reads and writes even for misaligned copies. it does not require that the cpu support misaligned accesses; instead, it performs bit shifts to realign the bytes for the destination. essentially, this is the C version of the ARM assembly language memcpy. the ideas are all the same, and it should perform well on any arch with a decent number of general-purpose registers that has a barrel shift operation. since the barrel shifter is an optional cpu feature on microblaze, it may be desirable to provide an alternate asm implementation on microblaze, but otherwise the C code provides a competitive implementation for "generic risc-y" cpu archs that should alleviate the urgent need for arch-specific memcpy asm.
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