The default expansion of builtin_longjmp will use nonlocal_goto if it is defined by the backend.
Looking at the builtin_longjmp expansion code in builtins.c, I find that it does not match the documentation for 'nonlocal_goto' in GCC internals: "the first argument is to be loaded into the frame pointer" However, the expand_goto() in stmt.c does match the GCC internal documentation. Reading the nonlocal_goto expansion i960.md, sparc.md and xtensa.md, didn't help to clear up the confusion. i960.md seems to treat the first argument as the frame pointer, whereas sparc.md & xtensa.md seems to treat the last argument as the frame pointer. Snippet from builtins.c: --- if (HAVE_nonlocal_goto) /* We have to pass a value to the nonlocal_goto pattern thatwill get copied into the static_chain pointer, but it does not matter what that value is, because builtin_setjmp does not use it. */ emit_insn (gen_nonlocal_goto (value, lab, stack, fp)); else --- -- Øyvind Harboe http://www.zylin.com
