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* [Bug tree-optimization/113894] New: `(x ^ (-CMP)) + CMP` -> `CMP ? -x : x`
@ 2024-02-12 20:42 pinskia at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2024-02-12 20:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113894
Bug ID: 113894
Summary: `(x ^ (-CMP)) + CMP` -> `CMP ? -x : x`
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
```
int f(int *x, int *y)
{
for(int i = 0 ; i < 1024; i++) {
int c = (y[i] == 123);
x[i] = (x[i] ^ -c) + c; // a ^ [0,-1] + [0,1]
}
}
int fa(int *x, int *y)
{
for(int i = 0 ; i < 1024; i++) {
int c = -(y[i] == 123);
x[i] = (x[i] ^ c) - c; // a ^ [0, -1] - [0,-1]
}
}
int f1(int *x, int *y)
{
for(int i = 0 ; i < 1024; i++) {
int c = y[i] == 123;
x[i] = c ? -x[i] : x[i];
}
}
```
These all should be optimized to f1.
When the CMP is `(x[i] <0)`, this should be optimized into ABS.
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