Displaying 1 result from an estimated 1 matches for "a3a362f1".
2017 Jul 05
3
Dataflow analysis regression in 3.7
Hi all,
I just found an optimization regression regarding simple
dataflow/constprop analysis:
https://godbolt.org/g/Uz8P7t
This code
```
int dataflow(int b) {
int a;
if (b==4)
a = 3*b; // fully optimized when changed to a = 3;
else
a = 5;
if (a == 4)
return 0;
else
return 1;
}
```
is no longer optimized to just a "return 1". The regression happened in
LLVM