https://bugs.llvm.org/show_bug.cgi?id=50279
Bug ID: 50279
Summary: compile-time explosion on valid C code at -O3 on clang
trunk version
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Hi, all.
$cat small.c
#include <stdint.h>
int a, c;
uint8_t b;
void d() {
int32_t e;
uint16_t *f;
for (; a;)
;
f = c;
g:
for (; e; e++) {
if (*f)
goto g;
for (; b; b++)
;
}
}
$clang -w -O3 small.c
//endless compiling
$clang -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
44d14d5de6f1f74246bf66dea5538ddc304e6445)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/tuhaoxin/compilers/llvm-project/build/bin
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/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/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
Reproduced in Godbolt: https://godbolt.org/z/f9b8Yac6q
Thanks,
Haoxin
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