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* [Bug tree-optimization/114273] New: `PHI(a, MIN(b, c)) < c` is not optimized to just `PHI(a,b) < c`
@ 2024-03-07 17:20 pinskia at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2024-03-07 17:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114273
Bug ID: 114273
Summary: `PHI(a, MIN(b, c)) < c` is not optimized to just
`PHI(a,b) < c`
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:
```
void dummy(void);
bool f(unsigned a, unsigned b, bool c)
{
unsigned ind = b;
if (c)
{
dummy();
ind = a > 6 ? 6 : a;
}
return ind < 6;
}
bool f2(unsigned a, unsigned b, bool c)
{
unsigned ind = b;
if (c)
{
dummy();
ind = a;
}
return ind < 6;
}
```
GCC should be able to remove the MIN_EXPR in f.
Note GCC is able to optimize `MIN_EXPR<a,b> < b` since
r14-3922-g06bedc3860d3e6 .
This seems like PRE is the place for this kind of optimization but I am not
100% sure.
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2024-03-07 17:20 [Bug tree-optimization/114273] New: `PHI(a, MIN(b, c)) < c` is not optimized to just `PHI(a,b) < c` pinskia at gcc dot gnu.org
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