[patch, ARM] Fix PR46934, Thumb-1 ICE

[Richard Earnshaw]

On 23 Mar 2011, at 14:52, "Chung-Lin Tang" <cltang@codesourcery.com> wrote:

> Hi, in the ARM "casesi" expand pattern, when the table base index
> constant is 0x8000000, it is stored sign extended as an rtx (const_int
> 0xffffffff8000000) (assuming 64-bit HOST_WIDE_INT).
> 
> Subtraction by adding GEN_INT(-INTVAL(operands[1])) then creates
> (const_int 0x80000000), which is not sign-extended, and fails to match
> the nonmemory_operand predicate later, causing a extract_insn failure
> ICE.  So the fix is to use gen_int_mode() instead of GEN_INT, which does
> the needed sign-extension.
> 
> Cross-tested on QEMU without regressions, okay for trunk?
> 
> Thanks,
> Chung-Lin
> <pr46934.diff>

Ok.  R.