Hi, I see that the avr_rtx_costs_1 function returns relative costs for a variety of RTL codes, but only for non-DImode operands. For DImode, it returns false, and gcc uses its idea of the cost plus the costs of operands (found by recursing into the RTL expression) instead.
Is there a reason why this has not been done? I was trying to debug compilation timeouts in the latest trunk test results (http://gcc.gnu.org/ml/gcc-testresults/2014-03/msg01239.html) - specifically WARNING: program timed out. FAIL: gcc.c-torture/execute/20041011-1.c compilation, -O1 and found that expmed.c:choose_mult_variant takes a lot of time to finish if a DImode value of -513 is provided. From my initial analysis, it looks like it has to do with cost values being off for DImode RTL operations (making MULT in avr_rtx_costs_1 to return twice the cost of SImode for DImode fixed the timeout). Has someone seen or fixed something like this before? Regards Senthil _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
