[llvm-bugs] [Bug 30378] New: ARM/Windows calls to unavailable function __moddi3

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30378

            Bug ID: 30378
           Summary: ARM/Windows calls to unavailable function __moddi3
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: martin at martin.st
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17260
  --> https://llvm.org/bugs/attachment.cgi?id=17260&action=edit
Sample input data

When targeting ARM/Windows, 32 bit remainder operations get mapped to __rt_sdiv
+ mls properly, but 64 bit operations end up as calls to __moddi3, which
doesn't exist in the MSVC builtins library.

The attached sample data shows how it behaves for these operations (built with
"llc -mtriple thumbv7-windows rem64.ll -o -").

One attempt at solving this has been made in https://reviews.llvm.org/D24076.

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