https://llvm.org/bugs/show_bug.cgi?id=26025
Bug ID: 26025
Summary: wrong code at -Os and above on x86_64-linux-gnu in
32-bit mode
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code is miscompiled by the current clang trunk on
x86_64-linux-gnu at -Os and above in the 32-bit mode (but not in the 64-bit
mode).
This is a regression from 3.7.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 256763)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.2.1
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/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.2.1
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-trunk -m32 -O1 small.c; ./a.out
$ clang-trunk -m64 -Os small.c; ./a.out
$ clang-3.7.0 -m32 -Os small.c; ./a.out
$
$ clang-trunk -m32 -Os small.c
$ ./a.out
Aborted (core dumped)
$ clang-trunk -m32 -O2 small.c
$ ./a.out
Aborted (core dumped)
$ clang-trunk -m32 -O3 small.c
$ ./a.out
Aborted (core dumped)
$
-------------------------------------------------
unsigned int c, f;
volatile char b, i;
unsigned long long d;
int
fn1 (int p1, int p2)
{
return p2 ? p2 : p1;
}
short
fn2 (int p1, int p2)
{
return p1 / p2;
}
char
fn3 (int p1)
{
return 0;
}
int
main ()
{
i = fn1 (c, fn2 ((f <= d) <= fn3 (b), -3));
if (i)
__builtin_abort ();
return 0;
}
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