https://bugs.llvm.org/show_bug.cgi?id=42451
Bug ID: 42451
Summary: hotcoldsplit makes function broken with "opt
-loop-unroll -mergereturn -hotcoldsplit -loop-rotate
-sroa -inline -barrier -loop-idiom -early-cse
-hotcoldsplit"
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 22168
--> https://bugs.llvm.org/attachment.cgi?id=22168&action=edit
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/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/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -loop-unroll -mergereturn -hotcoldsplit -loop-rotate -sroa -inline
-barrier -loop-idiom -early-cse -hotcoldsplit small.bc -o small-opt.bc
Instruction does not dominate all uses!
%k.sroa.5.i = alloca [6 x i8], align 8
%0 = bitcast [6 x i8]* %k.sroa.5.i to i8*
in function main
LLVM ERROR: Broken function found, compilation aborted!
-------------------------------------------------------
int a, b, c, g, h;
int i[2];
short l(d) {
int e = 0;
char f[6];
for (; e < 6; e++)
f[e] = 3;
return 1;
}
int *m();
short o(int *j) {
short k[3][3][2] = {1};
k[2][1][1];
k[1][2][1];
return c;
}
void p() { m(); }
int *m() {
{
int n;
b++;
for (; 0;) {
g;
g++;
for (; 0; 1)
return 0;
}
a--;
}
for (;;)
;
}
void main() { h || l(o((p(), i))); }
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
