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LLVM uses libgcc __mulodi4 etc. symbols for MSVC targets #164

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jckarter opened this issue Jan 8, 2012 · 1 comment
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LLVM uses libgcc __mulodi4 etc. symbols for MSVC targets #164

jckarter opened this issue Jan 8, 2012 · 1 comment
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llvm-upstream
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0.2

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jckarter commented Jan 8, 2012

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@jckarter jckarter mentioned this issue Jan 8, 2012
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Some notes:

  • Issue Bug with ULong(Float) conversion on windows #166 happens because LLVM tries to use _ftol2 for floating-point to unsigned long long conversion, but it doesn't use the correct calling convention. _ftol2 expects the input float to be passed on the x87 stack instead of following the C or stdcall convention. According to Bigcheese in #llvm, this will require a custom MInstr to handle.
  • __mulodi4 is the compiler-rt entry point for 64-bit multiplication with overflow. Not sure if msvcrt has a corresponding entry point; might need to do i64 overflow checking by hand (or disable it) on Windows.

@jckarter jckarter mentioned this issue Jan 25, 2012
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@retep998 retep998 mentioned this issue Sep 29, 2015
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