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Paul Eggert authored
* alloc.c (test_setjmp, mark_stack): * image.c (PNG_LONGJMP) [PNG_LIBPNG_VER < 10500]: (PNG_JMPBUF) [! (PNG_LIBPNG_VER < 10500)]: (png_load, my_error_exit, jpeg_load): * process.c (send_process_trap, send_process): Uniformly prefer _setjmp and _longjmp to setjmp and longjmp. The underscored versions are up to 30x faster on some hosts. Formerly, the code used setjmp+longjmp sometimes and _setjmp+_longjmp at other times, with no particular reason to prefer setjmp+longjmp.
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