f4e201e09f
NonowningIslPtr<isl_X> was used as types of function parameters when the function does not consume the isl object, i.e. an __isl_keep parameter. The alternatives are: 1. IslPtr<isl_X> This has additional calls to isl_X_copy and isl_X_free to increase/decrease the reference counter even though not needed. The caller already owns a reference to the isl object. 2. const IslPtr<isl_X>& This does not change the reference counter, but requires an additional load to get the pointer to the isl object (instead of just passing the pointer itself). Moreover, the compiler cannot rely on the constness of the pointer and has to reload the pointer every time it writes to memory (unless alias analysis such as TBAA says it is not possible). The isl C++ bindings currently in development do not have an equivalent to NonowningIslPtr and adding one would make the binding more complicated and its advantage in performance is small. In order to simplify the transition to these C++ bindings, remove NonowningIslPtr. Change every former use of it to alternative 2 mentioned aboce (const IslPtr<isl_X>&). llvm-svn: 295998 |
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| CMakeLists.txt | ||