https://llvm.org/bugs/show_bug.cgi?id=26973
Bug ID: 26973
Summary: crash on valid code at -O1 and above in 64-bit mode on
x86_64-linux-gnu (error in backend: Broken function
found)
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code crashes clang trunk at -O1 and above in 64-bit mode on
x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.9.0 (trunk 263641)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
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/4.9.2
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/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$:
$: clang-trunk -w -c small.c -O1
Instruction does not dominate all uses!
%dec3 = add nsw i32 %p1.addr.0, -1
%3 = sext i32 %dec3 to i64
fatal error: error in backend: Broken function found, compilation aborted!
clang-3.9: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 3.9.0 (trunk 263641)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-04eb97.c
clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-04eb97.sh
clang-3.9: note: diagnostic msg:
********************
$:
$: clang-trunk -w -c small.c -O0
$:
$: cat small.c
int a;
double b;
double *c;
void fn1(p1) {
for (;; p1--) {
a = p1;
for (; p1 >= a; a--)
b = c[p1];
}
}
$:
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