[llvm-dev] compiler-rt, v4.0: arm\udivsi3.S broken for division by zero

[Peter Jakubek via llvm-dev]

Hello,

I think the current implementation for the call "bl __aeabi_idiv0" in 
builtins\arm\udivsi3.S is broken.
At least for the case that __aeabi_idiv0 returns. (the provided 
implementation does)

Since LR is not preserved, the following JMP(lr) results in an endless loop.

Or is this an intentional change of the behavior?

The file contains another implementation enabled by 
__ARM_ARCH_EXT_IDIV__. This uses "b" instead of "bl".
(This works as in previous versions)

Cheers,

Peter