[Bug target/59379] [4.9 Regression] gomp_init_num_threads is compiled into an infinite loop with --with-arch=corei7 --with-cpu=slm

["hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59379

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
r202807 can bootstrap.  But r202811 failed with

[hjl@gnu-mic-2 libgcc]$
/export/build/gnu/gcc-lto-fdo/build-x86_64-linux/./gcc/xgcc
-B/export/build/gnu/gcc-lto-fdo/build-x86_64-linux/./gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include    -g -O2 -m32 -O2  -g -O2
-DIN_GCC   -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fpic -mlong-double-80 -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector   -fpic -mlong-double-80 -I. -I. -I../../.././gcc
-I/export/gnu/import/git/gcc/libgcc -I/export/gnu/import/git/gcc/libgcc/.
-I/export/gnu/import/git/gcc/libgcc/../gcc
-I/export/gnu/import/git/gcc/libgcc/../include
-I/export/gnu/import/git/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -o unwind-dw2-fde-dip.o -MT unwind-dw2-fde-dip.o -MD
-MP -MF unwind-dw2-fde-dip.dep -fexceptions -c
/export/gnu/import/git/gcc/libgcc/unwind-dw2-fde-dip.c -fvisibility=hidden
-DHIDE_EXPORTS
In file included from
/export/gnu/import/git/gcc/libgcc/unwind-dw2-fde-dip.c:89:0:
/export/gnu/import/git/gcc/libgcc/unwind-dw2-fde.c: In function
‘classify_object_over_fdes’:
/export/gnu/import/git/gcc/libgcc/unwind-dw2-fde.c:660:1: internal compiler
error: Segmentation fault
 }
 ^
0x5eb5ce crash_signal
    /export/gnu/import/git/gcc/gcc/toplev.c:335
0x931cb3 htab_find_slot_with_hash
    /export/gnu/import/git/gcc/libiberty/hashtab.c:655
0x931cb3 gen_rtx_CONST_INT
    /export/gnu/import/git/gcc/gcc/emit-rtl.c:410
0x931cb3 gen_int_mode
    /export/gnu/import/git/gcc/gcc/emit-rtl.c:420
0x931cb3 get_mode_bounds(machine_mode, int, machine_mode, rtx_def**, rtx_def**)
    /export/gnu/import/git/gcc/gcc/stor-layout.c:2840
0x95245e simplify_const_relational_operation(rtx_code, machine_mode, rtx_def*,
rtx_def*)
    /export/gnu/import/git/gcc/gcc/simplify-rtx.c:5151
0x9525ab simplify_const_relational_operation(rtx_code, machine_mode, rtx_def*,
rtx_def*)
    /export/gnu/import/git/gcc/gcc/simplify-rtx.c:5006
0x95b364 simplify_relational_operation(rtx_code, machine_mode, machine_mode,
rtx_def*, rtx_def*)
    /export/gnu/import/git/gcc/gcc/simplify-rtx.c:4602
0x7a6dd2 fold_rtx
    /export/gnu/import/git/gcc/gcc/cse.c:3378
0x7a7046 fold_rtx
    /export/gnu/import/git/gcc/gcc/cse.c:3209
0x7aa6aa cse_insn
    /export/gnu/import/git/gcc/gcc/cse.c:4578
0x7af736 cse_extended_basic_block
    /export/gnu/import/git/gcc/gcc/cse.c:6410
0x7af736 cse_main(rtx_def*, int) [clone .isra.18]
    /export/gnu/import/git/gcc/gcc/cse.c:6588
0xf5394b rest_of_handle_cse
    /export/gnu/import/git/gcc/gcc/cse.c:7438
0xf5394b (anonymous namespace)::pass_cse::execute() [clone .lto_priv.9491]
    /export/gnu/import/git/gcc/gcc/cse.c:7484
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

The only difference in GCC source is:

diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index 0f54f2b..b7c5255 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20130920
+20130921
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/59388] [4.7/4.8/4.9 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu
Date: Wed, 04 Dec 2013 23:53:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY388

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
            Summary|[4.9 Regression] ICE on     |[4.7/4.8/4.9 Regression]
                   |valid code at -O1 and above |ICE on valid code at -O1
                   |on x86_64-linux-gnu         |and above on
                   |                            |x86_64-linux-gnu

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Likely introduced in r179388.