On 7 October 2014 18:38, Jeff Law <l...@redhat.com> wrote:
> On 10/06/14 20:57, Joern Rennecke wrote:
>>
>> On 6 October 2014 19:58, Jeff Law <l...@redhat.com> wrote:
>>>
>>> What makes word_mode special here? ie, why is special casing for
>>> word_mode
>>> the right thing to do?
>>
>>
>> The patch does not special-case word mode. The if condition tests if
>> smode would
>> cover multiple hard registers.
>> If that would be the case, smode is replaced with word_mode.
>
> SO I'll ask another way. Why do you want to change smode to word_mode?
Because SImode covers four hard registers, wheras the intention is to
have a single
one.
(concatn:SI [
(reg:SI 18 r18)
(reg:SI 19 r19)
(mem/c:QI (plus:HI (reg/f:HI 28 r28)
(const_int 43 [0x2b])) [6 S1 A8])
(mem/c:QI (plus:HI (reg/f:HI 28 r28)
(const_int 44 [0x2c])) [6 S1 A8])
])
(see original post) is invalid RTL, and thuis the cause of the later ICE.
