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...working on bug 16387: "clang doesn't produce ARM EABI-compliant modulo runtime function" http://llvm.org/bugs/show_bug.cgi?id=16387 And I need some pointers. I've changed ARMISelLowering::ARMTargetLowering::ARMTargetLowering() to associate __aeabi_idivmod variants to RTLIB::{U,S}DIVREM_* library calls, but now I need to teach the expansion that on AEABI case, the remainder is not on the stack, but on registers. However, SelectionDAGLegalize::ExpandDivRemLibCall() assumes the remainder is *always* on the stack, as is the case for GNU: // Remainder is loaded back from the stack...