https://bugs.llvm.org/show_bug.cgi?id=41320
Bug ID: 41320
Summary: FunctionAttrs pass failed to deduce and/or propagate
function attributes
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 21710
--> https://bugs.llvm.org/attachment.cgi?id=21710&action=edit
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
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/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c
$opt -slp-vectorizer -sroa -loop-rotate -jump-threading small.bc -o
small-opt.bc
$opt -functionattrs small-opt.bc
In this step, opt will run a long time and cannot terminate.
I check it using godbolt, the problem also occurs for llvm 7/trunk. The
following is the output.
/compiler-explorer/c-preload/compiler-wrapper: line 21: 24515 Killed
"$@"
Compiler returned: 137
--------------------------------------------
a[];
b;
c() {
int d;
int *e = &d;
int *f[][6] = {a, a};
for (;;)
for (d = 9; d > 13;) {
int **g = &f[0][1];
*g = f[0][0];
h(**g);
e[b];
}
}
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