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...VM is smart enough to do tail call elimination on the recursion, so I got an infinite loop rather than a stack overflow :) Here's the patch, patterned after the correct implementation in umodsi3.c: diff --git a/lib/compiler-rt/lib/modsi3.c b/lib/compiler-rt/lib/modsi3.c index 388418a..3759ce0 100644 --- a/lib/compiler-rt/lib/modsi3.c +++ b/lib/compiler-rt/lib/modsi3.c @@ -16,8 +16,10 @@ /* Returns: a % b */ +su_int __divsi3(si_int a, si_int b); + si_int __modsi3(si_int a, si_int b) { - return a - (a / b) * b; + return a - __divsi3(a, b) * b; } Best, Matt