[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
-- rguenth at gcc dot gnu dot org changed: What|Removed |Added Priority|P3 |P2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #6 from ubizjak at gmail dot com 2010-08-01 11:41 ---
FYI, following shoot-in-the-dark patch didn't help, but I guess it is needed
together with some further reload surgery:
Index: gensupport.c
===
--- gensupport.c(revision 162794)
+++ gensupport.c(working copy)
@@ -1050,7 +1050,7 @@ static const struct std_pred_table std_p
{address_operand, true, true, {SUBREG, REG, MEM, PLUS, MINUS, MULT}},
{register_operand, false, false, {SUBREG, REG}},
{pmode_register_operand, true, false, {SUBREG, REG}},
- {scratch_operand, false, false, {SCRATCH, REG}},
+ {scratch_operand, false, false, {SCRATCH, SUBREG, REG}},
{immediate_operand, false, true, {UNKNOWN}},
{const_int_operand, false, false, {CONST_INT}},
{const_double_operand, false, false, {CONST_INT, CONST_DOUBLE}},
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #5 from ubizjak at gmail dot com 2010-07-25 18:06 --- *** Bug 44816 has been marked as a duplicate of this bug. *** -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #3 from vmakarov at redhat dot com 2010-05-10 15:22 --- It is caused by revision 152533: http://gcc.gnu.org/ml/gcc-cvs/2009-10/msg00182.html If it is so, the patch triggered some reload bug IMO. The patch itself was very safe because it resulted in creation of additional conflicts. I hope that Jeff Law's work on new reload will fix it when it is in 4.6 finally. Otherwise, we should work on this PR. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #4 from law at redhat dot com 2010-05-11 05:31 ---
I doubt my work will make a significant difference for this test.
We're trying to reload an insn which matches:
(define_insn *addmode3_cconly_overflow
[(set (reg:CCC FLAGS_REG)
(compare:CCC
(plus:SWI
(match_operand:SWI 1 nonimmediate_operand %0)
(match_operand:SWI 2 general_operand rim))
(match_dup 1)))
(clobber (match_scratch:SWI 0 =r))]
ix86_binary_operator_ok (PLUS, MODEmode, operands)
add{imodesuffix}\t{%2, %0|%0, %2}
[(set_attr type alu)
(set_attr mode MODE)])
(gdb) p debug_reload()
Reload 0: reload_in (SI) = (reg:SI 6 bp)
reload_out (SI) = (scratch:SI)
GENERAL_REGS, RELOAD_OTHER (opnum = 0), can't combine
reload_in_reg: (subreg:SI (reg:DI 6 bp [orig:66 D.2764 ] [66]) 0)
reload_out_reg: (scratch:SI)
$14 = void
(gdb) p debug_rtx (insn)
(insn 25 24 26 5 j.c:26 (parallel [
(set (reg:CCC 17 flags)
(compare:CCC (plus:SI (subreg:SI (reg:DI 6 bp [orig:66 D.2764 ]
[66]) 0)
(reg:SI 3 bx [orig:58 D.2737 ] [58]))
(subreg:SI (reg:DI 6 bp [orig:66 D.2764 ] [66]) 0)))
(clobber (scratch:SI))
]) 316 {*addsi3_cconly_overflow} (expr_list:REG_DEAD (reg:DI 6 bp
[orig:66 D.2764 ] [66])
(expr_list:REG_DEAD (reg:SI 3 bx [orig:58 D.2737 ] [58])
(nil
I think the only way to satisfy this reload is to allocate the scratch to
(subreg: SI (reg:DI 6)) I have no clue why reload doesn't do that.
--
law at redhat dot com changed:
What|Removed |Added
CC||law at redhat dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #1 from hjl dot tools at gmail dot com 2010-05-08 00:35 --- It failed with gcc 4.4.3 and 4.5.0. -- hjl dot tools at gmail dot com changed: What|Removed |Added Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|-00-00 00:00:00 |2010-05-08 00:35:54 date|| Summary|[4.6 Regression] ice in |[4.4/4.5/4.6 Regression] ice |subst_reloads, at |in subst_reloads, at |reload.c:6327 |reload.c:6327 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
[Bug target/44031] [4.4/4.5/4.6 Regression] ice in subst_reloads, at reload.c:6327
--- Comment #2 from hjl dot tools at gmail dot com 2010-05-08 00:40 --- It is caused by revision 152533: http://gcc.gnu.org/ml/gcc-cvs/2009-10/msg00182.html -- hjl dot tools at gmail dot com changed: What|Removed |Added CC||ubizjak at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44031
