[Bug lto/64412] New: [regression] ICE in offload compiler: in extract_insn, at recog.c:2327

["iverbin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64412

            Bug ID: 64412
           Summary: [regression] ICE in offload compiler: in extract_insn,
                    at recog.c:2327
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: iverbin at gcc dot gnu.org
                CC: bernds at gcc dot gnu.org, hubicka at gcc dot gnu.org,
                    kyukhin at gcc dot gnu.org, tschwinge at gcc dot gnu.org

After fixing PR lto/64043 (r218767) the offload target compiler began crashing
while reading intermediate bytecode.

FAIL: libgomp.c/examples-4/e.53.5.c (internal compiler error)
FAIL: libgomp.c/for-3.c (internal compiler error)
FAIL: libgomp.c++/for-11.C (internal compiler error)
FAIL: libgomp.fortran/examples-4/e.53.3.f90   -O2  (internal compiler error)
etc.


To reproduce using Intel Xeon Phi emulation:
1. Build offload and host compilers as described in
https://gcc.gnu.org/wiki/Offloading#How_to_try_offloading_enabled_GCC
2. Run make check-target-libgomp RUNTESTFLAGS="c.exp=e.53.5.c"


libgomp/testsuite/libgomp.c/examples-4/e.53.5.c: In function 'accum._omp_fn.1':
libgomp/testsuite/libgomp.c/examples-4/e.53.5.c:53:13: error: unrecognizable
insn:
     #pragma omp parallel for reduction(+:tmp)
             ^
(insn 176 66 177 4 (set (reg:DI 0 ax)
        (symbol_ref:DI ("Q") <var_decl 0x7fb57ffcb900 Q>)) -1
     (nil))
libgomp/testsuite/libgomp.c/examples-4/e.53.5.c:53:13: internal compiler error:
in extract_insn, at recog.c:2327
0xbadaf7 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        gcc/rtl-error.c:110
0xbadb38 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        gcc/rtl-error.c:118
0xb60522 extract_insn(rtx_insn*)
        gcc/recog.c:2327
0xb60221 extract_constrain_insn(rtx_insn*)
        gcc/recog.c:2228
0xb6e973 copyprop_hardreg_forward_1
        gcc/regcprop.c:773
0xb701db execute
        gcc/regcprop.c:1279
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
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mkoffload-intelmic: fatal error:
x86_64-pc-linux-gnu-accel-x86_64-intelmicemul-linux-gnu-gcc returned 1 exit
status
compilation terminated.
lto-wrapper: fatal error: accel/x86_64-intelmicemul-linux-gnu/mkoffload
returned 1 exit status
compilation terminated.
ld: lto-wrapper failed
collect2: error: ld returned 1 exit status