On Wednesday 10 October 2007, Wookey wrote: > OK. here is an update for gcc 4.1.2 that actually compiles. updated > by Laurence Withers.
gcc compiles; but it doesn't work. When running the crosscompiler, gcc fails with the message "instruction never exectued". > http://www.guralp.net/private/gcc-4.1-arm-eabi-on-armv4.patch I've updated the patches a little bit, adding in a couple of extra things, and placed the whole lot in a more permanent location at: http://www.lwithers.me.uk/usr/src/arm-eabi-on-armv4/ There are three patches, each with some (hopefully detailed) explanatory comments at the top. > Comments from people who actually understand GCC are very welcome - > so far we haven't got this to actually work. Yes, I'm afraid I'm totally stuck. I would certainly appreciate some help from anyone who understands gcc's code generation on arm. The bit that's failing is (much code snipped for brevity): void arm_print_operand (FILE *stream, rtx x, int code) { switch (code) { case 'D': /* CONST_TRUE_RTX means not always -- i.e. never. We shouldn't ever want to do that. */ if (x == const_true_rtx) { output_operand_lossage ("instruction never exectued"); return; } if (!COMPARISON_P (x)) { output_operand_lossage ("invalid operand for code '%c'", code); return; } fputs (arm_condition_codes[ARM_INVERSE_CONDITION_CODE (get_arm_condition_code (x))], stream); return; If I comment out the first test (x == const_true_rtx), the second gets triggered as well. > I gather from some comments Paul Brook made a while back that the > above code is only part of the solution and that something similar is > needed for library code too (or something like that). Clues welcome. There is some library code included in the gcc/gcc/config/arm directory, which is written in assembler and probably needs to be patched to use Richard's original tricks. There are also two places in glibc (the NPTL code, again ARM-specific bits written in assembler) which need patching in this manner as well. Bye for now, -- Laurence Withers, <[EMAIL PROTECTED]> http://www.lwithers.me.uk/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
