[llvm-dev] BUILD_VECTOR disambiguation

[Cameron McInally via llvm-dev]

Thanks for the clarification. The `except` seemed dangling to me, but
it's early here.

Just curious... how do we end up with a mixed type BUILD_VECTOR?
That's counterintuitive.

On Tue, Jul 7, 2020 at 10:58 AM Krzysztof Parzyszek via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Mixed integer types are ok, but the values will get truncated to the element type of the output value.  It's pretty much what the comment says.
>
> --
> Krzysztof Parzyszek  kparzysz at quicinc.com   AI tools development
>
> > -----Original Message-----
> > From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Cameron
> > McInally via llvm-dev
> > Sent: Tuesday, July 7, 2020 9:53 AM
> > To: LLVM Developers Mailing List <llvm-dev at lists.llvm.org>
> > Subject: [EXT] [llvm-dev] BUILD_VECTOR disambiguation
> >
> > Hey devs,
> >
> > From ISDOpcodes.h...
> >
> > /// BUILD_VECTOR(ELT0, ELT1, ELT2, ELT3,...) - Return a fixed-width vector
> > /// with the specified, possibly variable, elements. The number of elements
> > /// is required to be a power of two. The types of the operands must all be
> > /// the same and must match the vector element type, except that integer
> > types /// are allowed to be larger than the element type, in which case the
> > operands /// are implicitly truncated.
> > BUILD_VECTOR,
> >
> > Must the operand types always be the same? Or could we see a BUILD_VECTOR
> > with mixed integer types? E.g.:
> >
> > BUILD_VECTOR(i32, i32, i64, i32)
> >
> > Thanks,
> > Cam