http://llvm.org/bugs/show_bug.cgi?id=21440
Bug ID: 21440
Summary: Inconsistent Output at O1 optimization level
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Classification: Unclassified
Test case :
suyog@suyog-Inspiron-N5010:~$ cat 1.c
#include<stdio.h>
int foo(long a) {
long b = --a;
return b > 0;
}
int main() {
int x;
if(foo(0x80000000L)==0)
printf("Hi\n");
else printf("Hello\n");
return 0;
}
With -O0 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O0 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hello
With -O1 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O1 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hi
With -O12 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O2 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hello
The trunk revision is 220994
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