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...ning multiply addw i32 %lhs %rhs -> i33 ; widening add addc i32 %lhs, i32 %rhs, i1 %c -> i33 ; add with carry Alternatively, would something like following get reduced to a single multiply and two stores on arch's that support wide multiplies, like x86-32 and ARM? define void @mulw(i32* hidest, i32* lodest, i32 lhs, i32 rhs) { %0 = sext i32 %lhs to i64 %1 = sext i32 %rhs to i64 %2 = mul i64 %0 %1 %3 = trunc i64 %2 to i32 %4 = lshr i64 %2, 32 %5 = truc i64 %4 to i32 store i32 %3, i32* %lodest store i32 %5, i32* %hidest ret void } Another alternative could rely on multip...