The patch below fixes gcc.c-torture/execute/builtin-bitops-1.c on ARM/Thumb-2
targets.
The story here is that ARM doesn't have a 64-bit shift operator, so these get
decomposed into something like:
low1 = (low n)
low1 |= (high (32 - n)) /**/
low2 = high (32 - n)
low_result = (n 32) ? low2 :
On 19/09/11 10:12, Paul Brook wrote:
In Thumb-2 mode we try and match an M constraint (const_int between 0 and
31) with no other alternatives. This fails, and with nowhere else to go we
ICE.
The fix is to restrict the predicate for these insns to only accept valid
const_int shift counts. This
