https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763
Manuel Lauss <manuel.lauss at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manuel.lauss at googlemail dot
com
--- Comment #16 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
I've seen this as well.
Build llvm-7 with gcc-7.3, -m32 -march=znver1 -mtune=broadwell
-O1 / -Og: all good
-O2: llvm-tblgen runs in an infinite(?) loop
-O3: llvm-tblgen segfaults
-mno-bmi: all good, at all optimization levels
In case it helps, here's gdb info:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x080a96c9 in llvm::MachineValueTypeSet::const_iterator::find_from_pos
(P=<optimized out>, this=<synthetic pointer>)
at
/tmp-ram/x1/portage/sys-devel/llvm-9999/work/llvm-9999/utils/TableGen/CodeGenDAGPatterns.h:148
148 W &= maskLeadingOnes<WordType>(WordWidth-SkipBits);
(gdb) list
143
144 // If P is in the middle of a word, process it manually here,
because
145 // the trailing bits need to be masked off to use findFirstSet.
146 if (SkipBits != 0) {
147 WordType W = Set->Words[SkipWords];
148 W &= maskLeadingOnes<WordType>(WordWidth-SkipBits);
149 if (W != 0)
150 return Count + findFirstSet(W);
151 Count += WordWidth;
152 SkipWords++;
[...]
0x080a968d <+1293>: shr $0x6,%ebx
0x080a9690 <+1296>: and $0xffffffc0,%esi
0x080a9693 <+1299>: and $0x3f,%eax
0x080a9696 <+1302>: je 0x80a96e0
<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&)+1376>
0x080a9698 <+1304>: mov $0x40,%ecx
0x080a969d <+1309>: mov $0xffffffff,%edx
0x080a96a2 <+1314>: xor %edi,%edi
0x080a96a4 <+1316>: sub %eax,%ecx
0x080a96a6 <+1318>: mov $0xffffffff,%eax
0x080a96ab <+1323>: shrd %cl,%edx,%eax
0x080a96ae <+1326>: test $0x20,%cl
0x080a96b1 <+1329>: shrx %ecx,%edx,%edx
0x080a96b6 <+1334>: cmovne %edx,%eax
0x080a96b9 <+1337>: cmovne %edi,%edx
0x080a96bc <+1340>: mov %edx,%ecx
0x080a96be <+1342>: mov %eax,%edx
0x080a96c0 <+1344>: mov -0x3c(%ebp),%eax
0x080a96c3 <+1347>: andn (%eax,%ebx,8),%edx,%eax
=> 0x080a96c9 <+1353>: andn 0x4(%eax,%ebx,8),%ecx,%edx
0x080a96d0 <+1360>: mov %edx,%edi
0x080a96d2 <+1362>: or %eax,%edi
0x080a96d4 <+1364>: jne 0x80a9e70
<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&)+3312>
0x080a96da <+1370>: add $0x40,%esi
0x080a96dd <+1373>: add $0x1,%ebx
0x080a96e0 <+1376>: cmp $0x4,%ebx
0x080a96e3 <+1379>: je 0x80a9e60
<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&)+3296>
0x080a96e9 <+1385>: mov -0x3c(%ebp),%eax
0x080a96ec <+1388>: mov 0x4(%eax,%ebx,8),%edx
0x080a96f0 <+1392>: mov (%eax,%ebx,8),%eax
0x080a96f3 <+1395>: mov %edx,%ecx
0x080a96f5 <+1397>: or %eax,%ecx
0x080a96f7 <+1399>: jne 0x80a9e42
<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&)+3266>
0x080a96fd <+1405>: lea 0x1(%ebx),%eax
[...]
(gdb) info registers
eax 0x18000040 402653248
ecx 0x0 0
edx 0x3f 63
ebx 0x0 0
esp 0xff8f9660 0xff8f9660
ebp 0xff8f96c8 0xff8f96c8
esi 0x0 0
edi 0x0 0
eip 0x80a96c9 0x80a96c9
<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&)+1353>
eflags 0x10202 [ IF RF ]
cs 0x23 35
ss 0x2b 43
ds 0x2b 43
es 0x2b 43
fs 0x0 0
gs 0x63 99
