>> My question is: >> should I implement umodhi3 and udivhi3 and include them in libgcc so >> __divsi3 is alright, >> or should I implement divmodsi4 to override __divsi3 and __modsi3? > > It's a question of runtime efficiency. If it is faster to compute just > the quotient or the remainder, then implement __divsi3 and __modsi3 in > libgcc. If the processor gives you both the quotient and the remainder > at the same time, then implement the udivmodsi4 insn in the MD file > (e.g., avr.md). Thank you. Actually the processor give me nothing. It does not support div or mod just like MSP430. But when I take a look at msp430.md I find out that they implemented divmodM4 with add and sub. In your opinion, if a machine does not support mul/div/mod, should these instructions always be implemented in separate div and mod way? Regards. Florent
