[llvm-bugs] [Bug 31108] New: wrong code with "opt -inline -loop-extract"
via llvm-bugs
llvm-bugs at lists.llvm.org
Mon Nov 21 16:56:51 PST 2016
https://llvm.org/bugs/show_bug.cgi?id=31108
Bug ID: 31108
Summary: wrong code with "opt -inline -loop-extract"
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
$ clang -v
clang version 4.0.0 (trunk 287325)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang -c -w -emit-llvm -o small.bc small.c
$
$ llc -o small.s small.bc
$ gcc small.s
$ ./a.out
$
$ opt -inline -loop-extract -o small-opt.bc small.bc
$ llc -o small-opt.s small-opt.bc
$ gcc small-opt.s
$ timeout -s 9 10 ./a.out
Killed
$
--------------------------------------
int a;
void fn1 (int p)
{
int b[] = { 1 };
}
void fn2 ()
{
while (a)
{
int c[] = { 2 }, d;
d;
}
}
void fn3 ()
{
int e = 0, f[7];
for (; e < 3; e++)
fn1 ((f, 7));
}
int main ()
{
fn3 ();
fn2 ();
return 0;
}
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