https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Can-clbas-dcopy-support-overlapping-regions-for-source-and/m-p/785446#M1827 Underlying code works the same as public source versions. According to Fortran rules, overlap isn't permitted, as if the prototypes were defined with *restrict. In practice, it will likely work OK with overlap, if copying toward smaller addresses with positive increment parameters, or toward larger addresses with negative increments.<BR />memmove() is fairly efficient in most current implementations (maybe better than ?copy for the case of both increments negative), so it may not make sense to use ?copy in such cases. Tue, 16 Nov 2010 04:15:20 GMT TimP 2010-11-16T04:15:20Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Can-clbas-dcopy-support-overlapping-regions-for-source-and/m-p/785445#M1826 I couldn't seem to find this in the docs, though I'm sure it's specified somewhere.<DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;"><BR /></SPAN><DIV></DIV><DIV>Can cblas_?copy support overlapping regions for the source and destinations vectors?</DIV></DIV> Mon, 15 Nov 2010 22:54:57 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Can-clbas-dcopy-support-overlapping-regions-for-source-and/m-p/785445#M1826 chollida01 2010-11-15T22:54:57Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Can-clbas-dcopy-support-overlapping-regions-for-source-and/m-p/785446#M1827 Underlying code works the same as public source versions. According to Fortran rules, overlap isn't permitted, as if the prototypes were defined with *restrict. In practice, it will likely work OK with overlap, if copying toward smaller addresses with positive increment parameters, or toward larger addresses with negative increments.<BR />memmove() is fairly efficient in most current implementations (maybe better than ?copy for the case of both increments negative), so it may not make sense to use ?copy in such cases. Tue, 16 Nov 2010 04:15:20 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Can-clbas-dcopy-support-overlapping-regions-for-source-and/m-p/785446#M1827 TimP 2010-11-16T04:15:20Z