segmentation fault of target program caused by loop-unroll with "opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll -loop-unroll" #41620
Description
| Bugzilla Link | 42275 |
| Version | trunk |
| OS | Linux |
| Attachments | .bc file of the source code |
| CC | @rotateright |
Extended Description
$clang -v
clang version 9.0.0 (trunk 362492)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c
$opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll -loop-unroll small.bc -o small-opt.bc
$clang small-opt.bc -o small.out && ./small.out
Segmentation fault (core dumped)
without loop-unroll pass, the target program is fine.
$opt -sroa -indvars -loop-rotate -simplifycfg -inline -loop-reroll small.bc -o small-opt1.bc
$clang small-opt1.bc -o small1.out && ./small1.outvoid a() {
short b[6][2][7];
int c, d, e;
for (c = 0; c < 6; c++) {
for (d = 0; d < 2; d++) {
for (e = 0; e < 7; e++)
b[c][d][e] = 1;
}
}
}
void main() { a(); }