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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang memory hog + time hog + Killed signal on valid C code (on target i386-unknown-linux-gnu)"
href="https://bugs.llvm.org/show_bug.cgi?id=50464">50464</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang memory hog + time hog + Killed signal on valid C code (on target i386-unknown-linux-gnu)
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>haoxintu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hi all.
$cat small.c
#include <stdint.h>
uint16_t us_0 = 0x059C;
uint16_t us_6 = 0x944B;
int32_t i_7 = 0x75F5FBC4;
uint64_t uli_10 = 0xA306B7BACA58FABD;
volatile uint64_t uli_11 = 0x3C1DB306CBCC06F0;
uint64_t uli_13 = 0x532BB157E5921AFD;
int func(){
long i_17;
unsigned uli_19;
short uli_21;
volatile int64_t li_24 = 0xAADB149E383E3931;
uint64_t *ptr_26 = &uli_11;
int64_t li_29 = 0x0;
uint16_t *ptr_30 = &us_0;
volatile uint64_t uli_31 = 0x4A1CA3B53FBE0D95;
*ptr_30 /= (uli_31 = (((0x0 == 0x0) != (0xDF3E && i_7)) >= (uli_21 -=
(li_24 <= i_17))));
for(i_17 = 9; i_17 <= 57; i_17 += 1){
uint64_t uli_40 = 0xBD803862B3FC4908;
if((li_29 = (((uli_21 |= uli_11) & (*ptr_26 /= uli_19)) && ((uli_13 >
0x0) + (uli_40 -= uli_10))))){
;
}
}
*ptr_30 /= (uli_31 = (((0x0 == 0x0) != (0xDF3E && i_7)) >= (uli_21 -=
(li_24 <= i_17))));
return 0;
}
int main(){
func();
return 0;
}
$time clang -w -g -m32 -O3 small.c (clang eats all my 64G memory then triggers
the killed signal)
clang-13: error: unable to execute command: Killed
clang-13: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project">https://github.com/llvm/llvm-project</a>
f47575f83ceac6b3023b540de4286239f61a5107)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/haoxin-data/dut-research/compilers/llvm-project/build-afl/bin
clang-13: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/small-317793.c
clang-13: note: diagnostic msg: /tmp/small-317793.sh
clang-13: note: diagnostic msg:
********************
real 29m27.981s
user 28m30.728s
sys 0m25.610s
$time clang -w -g -O3 small.c
real 0m0.224s
user 0m0.116s
sys 0m0.038s
Note that this issue may cause by one of the commits after
7d6449322ecba2fa34090ca8ed610328febee108. I tested this case on the above
commit version and clang can handle it well.
This code also can not be compiled on Godbolt currently:
<a href="https://godbolt.org/z/hb4zE33cn">https://godbolt.org/z/hb4zE33cn</a>
Thanks
Haoxin</pre>
</div>
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