[PATCH] Fix 78550 ICE with bit-field initialization

[Richard Biener]

On Thu, Dec 8, 2016 at 5:38 PM, Nathan Sidwell <nathan@acm.org> wrote:
> This patch fixes 78550, where we ICE in varasm as we discover a
> code-generating NOP_EXPR of an INTEGER_CST.  output_constructor (varasm.c)
> has a STRIP_NOPs, but that leaves the NOP alone, as it is truncating a
> regular QI mode operand to a 1 bit type.
>
> That tree is generated in convert.c:
>       /* If TYPE is an enumeral type or a type with a precision less
>          than the number of bits in its mode, do the conversion to the
>          type corresponding to its mode, then do a nop conversion
>          to TYPE.  */
> ....
>           return fold_build1_loc (dofold, loc, NOP_EXPR, type, ...);
>         }
> Fixed by changing it to maybe_fold_build1_loc.  Surrounding code uses that
> function.
>
> ok?

Ok.

Thanks,
Richard.

> nathan
> --
> Nathan Sidwell