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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am currently adding support for an experimental 32-bit OpenMP target device using x86_64 as a host. There seems to be a bug in<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'>bool Sema::Sema::isOpenMPCapturedByRef(…,) {<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>…<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> if (!IsByRef &&<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> (Ctx.getTypeSizeInChars(Ty) ><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> Ctx.getTypeSizeInChars(Ctx.getUIntPtrType()) ||<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> Ctx.getDeclAlign(D) > Ctx.getTypeAlignInChars(Ctx.getUIntPtrType()))) {<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> IsByRef = true;<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> }<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> return IsByRef;<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>}<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The above code assumes that the target device’s UIntPtr size is the same as the host’s UIntPtr which is not true in my case. So, if you pass a 64-bit double to a 32-bit device the host compilation pass uses by-value argument passing, because the value fits into the 64-bit pointers. However, if you build for the target (-fopenmp-is-device), the 64-bit float does not fit into the 32-bit pointer, so the target assumes that the value is passed by-reference and the device does not pick up the correct argument value.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>A possible fix would to use something like this<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'> if (!IsByRef &&<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> (Ctx.getTypeSizeInChars(Ty) ><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> DCtx.getTypeSizeInChars(DCtx.getUIntPtrType()) ||<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> Ctx.getDeclAlign(D) > DCtx.getTypeAlignInChars(DCtx.getUIntPtrType()))) {<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> IsByRef = true;<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>where DCtx is the context of the target device. But that context does not seem to be available in the host’s Sema.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sema.LangOpts.OMPTargetTriples seems to be the only available starting point to get to a device’s context, or am I missing something?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Andreas<o:p></o:p></p></div></body></html>