[Bug rtl-optimization/45792] New: [4.6 Regression]: cris-elf build failure (hangs) due to fix for PR44374
hp at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Sat Sep 25 19:06:00 GMT 2010
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45792
Summary: [4.6 Regression]: cris-elf build failure (hangs) due
to fix for PR44374
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hp@gcc.gnu.org
CC: bernds@gcc.gnu.org
Host: x86_64-unknown-linux-gnu
Target: cris-*-*
Created attachment 21882
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=21882
Preprocessed dtoa.c
At r164551 the tree built with few regressions.
At r164560 building newlib/libc/stdlib/dtoa.c hangs (cpu-time > 38 hours) and
at r164619 the build is at a similar state (didn't wait 38 hours, but see
below).
Attaching a gdb-session to the running cc1 at r164619 shows an infinite loop in
gcc/emit-rtl.c:reorder_insns:
4027 for (x = from; x != NEXT_INSN (to); x = NEXT_INSN (x))
4028 if (!BARRIER_P (x))
4029 df_insn_change_bb (x, bb);
But "x" is bogus; it seems to have been deleted or at least removed from the
insn stream:
(insn 2210 2210 2210 239 (set (cc0)
(compare (reg/v/f:SI 3 r3 [orig:95 mlo ] [95])
(reg/v/f:SI 4 r4 [orig:97 mhi ] [97])))
/tmp/hpautotest-gcc1/gcc/newlib/libc/stdlib/dtoa.c:808 11 {*cmpsi}
(nil))
The call to df_insn_change_bb takes the (old_bb == new_bb) early return.
Author of suspect patch in revision range CC:ed.
Preprocessed dtoa.c attached. Compile with -O2.
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