https://bugs.llvm.org/show_bug.cgi?id=40757
Bug ID: 40757
Summary: Compilation does not end when -O3 or more is set.
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: ueno.masak...@jp.fujitsu.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
When compiling the following program(bug498.c) with -O3 or more, compilation
does not end.
I think there is something wrong with Loop Strength Reduction Pass.
This problem can be avoided by the -mllvm -disable-lsr option.
* source program(bug498.c)
#include <stdio.h>
int main () {
int i,j,l=0,m=3,n=40;
unsigned long v1=1,v2=2,v3=3;
int a[50][50],b[50][50];
for (i=0; i<50; i++) {
for (j=0; j<50; j++) {
a[i][j]=0;
b[i][j]=1;
}
}
for(i=0;i<10;i++) {
for (l=0; l<4; l++) {
for(m=0; m<30; m++) {
for(j=0;j<2;j++) {
v3=v2 * v2;
}
v1=v3 - v1;
v2=v1 - i;
b[i][j]=a[i][j]+b[i][j];
}
}
}
printf("%lu %lu %lu %d\n",v1,v2,v3, b[0][0]);
return 0;
}
* compile/exec log using -mllvm -disable-lsr option
$ clang -O3 bug498.c -mllvm -disable-lsr
$ ./a.out
12145924650467887591 12145924650467887582 3040934746218291456 1
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