| Summary: | [6 Regression] ICE in get_attr_got, at config/mips/mips.md:694 on mips-linux-gnu | ||
|---|---|---|---|
| Product: | gcc | Reporter: | Matthias Klose <doko> |
| Component: | target | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | nickc, sje |
| Priority: | P3 | Keywords: | ice-on-valid-code |
| Version: | 6.0 | ||
| Target Milestone: | 6.0 | ||
| Host: | Target: | mips-linux-gnu, mipsel-linux-gnu | |
| Build: | Known to work: | 5.3.1 | |
| Known to fail: | 6.0 | Last reconfirmed: | |
I could not reproduce this with todays (Jan 5, 2016) top-of-tree. I built mips-linux-gnu and mipsel-linux-gnu with Fortran and the library built just fine. I also tried the test case that was included and that also compiled. I got some warnings, but no ICE. I was building a cross compiler running on x86 linux (ubuntu 12.04) and I tried mips-linux-gnu and mipsel-linux-gnu targets. rechecked with today's trunk on Debian unstable, reproduced. The compiler is configured with: configure -v --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-6 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libsanitizer --disable-libquadmath --enable-plugin --with-system-zlib --enable-multiarch --enable-multilib --with-arch-32=mips32r2 --with-fp-32=xx --enable-targets=all --with-arch-64=mips64r2 --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=mips-linux-gnu --program-prefix=mips-linux-gnu- --includedir=/usr/mips-linux-gnu/include according to https://buildd.debian.org/status/logs.php?pkg=gcc-snapshot&arch=mipsel the libgfortran failure is first seen with trunk 20150722 in native builds. The bug same as pr69012 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69012 Hi Guys, I was able to reproduce the bug as specified. It turns out that there is a race condition in mips_compute_frame which can result in fields in the frame structure being used before they are initialised. I have submitted a possible patch for review here: https://gcc.gnu.org/ml/gcc-patches/2016-01/msg01407.html Cheers Nick Author: nickc Date: Thu Jan 21 14:07:01 2016 New Revision: 232674 URL: https://gcc.gnu.org/viewcvs?rev=232674&root=gcc&view=rev Log: PR target/69129 PR target/69012 * config/mips/mips.c (mips_compute_frame_info): Initialise args_size and hard_frame_pointer_offset fields of the frame structure before calling mips_global_pointer. PR target/69129 * gcc.target/mips/pr69129.c: New. Added: trunk/gcc/testsuite/gcc.target/mips/pr69129.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/mips/mips.c trunk/gcc/testsuite/ChangeLog |
seen with trunk 20160103, building libgfortran $ gcc/build/./gcc/xgcc -B/scratch/packages/cross/6/gcc-6-cross-1/gcc/build/./gcc/ -std=gnu11 -fcx-fortran-rules -ffunction-sections -fdata-sections -g -O2 -minterlink-mips16 -c maxval_r4.i ../../../src/libgfortran/generated/maxval_r4.c: In function 'maxval_r4': ../../../src/libgfortran/generated/maxval_r4.c:200:1: error: unrecognizable insn: (insn 691 690 693 2 (parallel [ (set (mem/c:SI (plus:SI (reg/f:SI 29 $sp) (const_int 16 [0x10])) [11 S4 A32]) (unspec:SI [ (const_int 16 [0x10]) (reg:SI 28 $28) ] UNSPEC_POTENTIAL_CPRESTORE)) (clobber (scratch:SI)) ]) ../../../src/libgfortran/generated/maxval_r4.c:42 -1 (expr_list:REG_DEAD (reg:SI 28 $28) (nil))) ../../../src/libgfortran/generated/maxval_r4.c:200:1: internal compiler error: in get_attr_got, at config/mips/mips.md:694 0x8f29a8 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) ../../src/gcc/rtl-error.c:108 0x8f29d9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) ../../src/gcc/rtl-error.c:116 0xc2a486 get_attr_got(rtx_insn*) ../../src/gcc/config/mips/mips.md:694 0xb82f98 mips_insn_has_flexible_gp_ref_p ../../src/gcc/config/mips/mips.c:9927 0xb75ea7 mips_find_gp_ref ../../src/gcc/config/mips/mips.c:9858 0xb81f51 mips_global_pointer ../../src/gcc/config/mips/mips.c:9979 0xb81f51 mips_compute_frame_info ../../src/gcc/config/mips/mips.c:10350 0xb8c7ae mips_initial_elimination_offset(int, int) ../../src/gcc/config/mips/mips.c:10591 0x8f42b3 rtx_addr_can_trap_p_1 ../../src/gcc/rtlanal.c:618 0x8f415f rtx_addr_can_trap_p_1 ../../src/gcc/rtlanal.c:678 0x8f7d3e may_trap_p_1(rtx_def const*, unsigned int) ../../src/gcc/rtlanal.c:2819 0x67fc64 can_move_insns_across(rtx_insn*, rtx_insn*, rtx_insn*, rtx_insn*, basic_block_def*, bitmap_head*, bitmap_head*, rtx_insn**) ../../src/gcc/df-problems.c:4156 0xd234d7 dead_or_predicable ../../src/gcc/ifcvt.c:5079 0xd2905e find_if_case_1 ../../src/gcc/ifcvt.c:4770 0xd2905e find_if_header ../../src/gcc/ifcvt.c:4171 0xd2905e if_convert ../../src/gcc/ifcvt.c:5305 0xd29b2d execute ../../src/gcc/ifcvt.c:5495 Please submit a full bug report, with preprocessed source if appropriate. _Noreturn fn1() __attribute__((__visibility__("hidden"))); fn2(struct gfc_array_r4 *p1) { int a[7]; float *b; int c, n; if (c != p1) fn1(); n = 0; for (; c; n++) { int d; if (a[n] != d) fn1(n); } b = p1; while (1) { *b = 3.40282347e38f; if (a[0]) return; } }