https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91030
--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- (In reply to David Edelsohn from comment #13) > Why should -fconvert affect the strategy for writing? If we get passed a contiguous block of memory (like in your test case) we can do this in a single write. If we want to swap bytes, this needs to be done on a basis of each data item. It would be wasteful to write out each data item by itself, so do this by copying to a buffer until it is full, and then writing out the buffer. The effect on speed could be tested simply enough. Just write two test programs, one of them mimicking the current behavior of libgfortran (writing out 8192 byte blocks, possibly starting with a smaller size) and the other one with one huge write. Use the write() system call directly. Benchmark both.
