[ARM] Use __rt_div functions for divrem on Windows
This avoids falling back to calling out to the GCC rem functions
(__moddi3, __umoddi3) when targeting Windows.
The __rt_div functions have flipped the two arguments compared
to the __aeabi_divmod functions. To match MSVC, we emit a
check for division by zero before actually calling the library
function (even if the library function itself also might do
the same check).
Not all calls to __rt_div functions for division are currently
merged with calls to the same function with the same parameters
for the remainder. This is more wasteful than a div + mls as before,
but avoids calls to __moddi3.
Differential Revision: https://reviews.llvm.org/D24076
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283383
91177308-0d34-0410-b5e6-
96231b3b80d8
OSDN Git Service
