64cf33952d
The Xtensa L1 cache layer has straightforward semantics accessible via single-instructions that operate on cache lines via physical addresses. These are very amenable to inlining. Unfortunately the Xtensa HAL layer requires function calls to do this, leading to significant code waste at the calling site, an extra frame on the stack and needless runtime instructions for situations where the call is over a constant region that could elide the loop. This is made even worse because the HAL library is not built with -ffunction-sections, so pulling in even one of these tiny cache functions has the effect of importing a 1500-byte object file into the link! Add our own tiny cache layer to include/arch/xtensa/cache.h and use that instead. Signed-off-by: Andy Ross <andrew.j.ross@intel.com> |
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