[LLVMdev] type promotion i16 -> i32

[Giovanni Ansaloni]

Hello,
  I'm developing a llvm backend. It seems that, if i16 is not a legal type
(no register can hold i16 types in RegisterInfo.td and as a RegisterClass in
SelLowering.cpp), i16 should be promoted to i32.
Nonotheless, this simple program:

int main(){
  volatile short a;
  a= 3;
  return 0;
}

which is trasformed in this IR:

define i32 @main() nounwind readnone {
entry:
  %a = alloca i16, align 2                        ; <i16*> [#uses=1]
  volatile store i16 3, i16* %a, align 2
  ret i32 0
}

fails to compile with the following error:

LLVM ERROR: Cannot yet select: 0x181c2d0: ch = store 0x1204a08, 0x181c248,
0x181be90, 0x181bfa0 <0x12022ec:0> <trunc i16> <volatile> alignment=2

Can anybody help?
Thanks
Giovanni.

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