http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58967
Bug ID: 58967
Summary: Powerpc -mlra cannot compile quadrature_lib.cc in
Spec2006 with -O3 -ffast-math -funroll-loops -m32
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Created attachment 31138
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31138&action=edit
-save-temps=obj output of the preprocessor of the bug that shows the problem
Subversion id 204267 of the trunk of GCC cannot build the module
quadrature_lib.cc in the Spec 2006 dealII benchmark if you use the -O3
-ffast-math -funroll-loops -m32 -mlra options. If you eliminated the -mlra
option, it compiles fine. If you eliminate the -funroll-loops option, but keep
the -mlra option, it works fine.
Here is the traceback:
-bns-> /opt/at7.0/bin/gdb cc1plus
GNU gdb (GDB) 7.6.50.20130722-cvs
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "powerpc64-linux".
Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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..
Reading symbols from
/home/meissner/fsf-build-ppc64/trunk-204267/gcc/cc1plus...done.
Breakpoint 1 at 0x10eb5840: file
/home/meissner/fsf-src/trunk-204267/gcc/diagnostic.c, line 1182.
Breakpoint 2 at 0x10eb7190: file
/home/meissner/fsf-src/trunk-204267/gcc/diagnostic.c, line 1123.
Breakpoint 3 at 0x10f29548
Breakpoint 4 at 0x10f295a0
File tree.h will be skipped when stepping.
Successfully loaded GDB hooks for GCC
(gdb) r -O3 -funroll-loops -mcpu=power7 -ffast-math -quiet -mlra -m32
quadrature_lib.ii
Starting program: /home/meissner/fsf-build-ppc64/trunk-204267/gcc/cc1plus -O3
-funroll-loops -mcpu=power7 -ffast-math -quiet -mlra -m32 quadrature_lib.ii
Breakpoint 1, fancy_abort (file=0x10f9edf0
"/home/meissner/fsf-src/trunk-204267/gcc/lra.c", line=2034, function=0x10f9eba8
<check_rtl(bool)::__FUNCTION__> "check_rtl")
at /home/meissner/fsf-src/trunk-204267/gcc/diagnostic.c:1182
1182 {
(gdb) up
#1 0x0000000010731660 in check_rtl (final_p=final_p@entry=true) at
/home/meissner/fsf-src/trunk-204267/gcc/lra.c:2034
2034 lra_assert (constrain_operands (1));
(gdb) print insn
$1 = (rtx) 0xfffa970f540
(gdb) pr
warning: Expression is not an assignment (and might have no effect)
(insn 405 602 390 22 (set (reg:TF 35 3)
(mem/u/c:TF (lo_sum:SI (reg:SI 9 9 [443])
(symbol_ref/u:SI ("*.LC10") [flags 0x82])) [64 S16 A128]))
quadrature_lib.cc:80 452 {*movtf_internal}
(nil))
(gdb)
