On 4/13/23 07:45, Jakub Jelinek wrote:
On Thu, Apr 13, 2023 at 06:35:07AM -0600, Jeff Law wrote:
Bootstrap was successful with v3, but there's hundreds of testsuite failures
due to the simplify-rtx hunk. compile/20070520-1.c for example when
compiled with: -O3 -funroll-loops -march=rv64gc -mabi=lp64d
Thursdays are my hell day. It's unlikely I'd be able to look at this at all
today.
So, seems to me this is because loop-iv.cc asks for invalid RTL to be
simplified, it calls simplify_gen_binary (AND, SImode,
(subreg:SI (plus:DI (reg:DI 289 [ ivtmp_312 ])
(const_int 4294967295 [0xffffffff])) 0),
(const_int 4294967295 [0xffffffff]))
but 0xffffffff is not valid SImode CONST_INT, and unlike previously
we no longer on WORD_REGISTER_OPERATIONS targets which have DImode
word_mode optimize that into the op0, so the invalid constant is emitted
into the IL and checking fails.
The following patch fixes that (and we optimize that & -1 away even earlier
with that).
Could you please just quickly try to apply this patch, make in the stage3
directory followed by
make check-gcc RUNTESTFLAGS="... compile.exp='20070520-1.c ...'"
(with all tests that regressed previously), whether this is the only spot
or whether we need to fix some other place too?
2023-04-13 Jakub Jelinek <ja...@redhat.com>
* loop-iv.cc (iv_number_of_iterations): Use gen_int_mode instead
of GEN_INT.
I'll try to apply this and do just an incremental build & test to see if
it resolves all the regressions. It should complete while I'm in my
meeting hell.
jeff
