 Sergej Jaskiewicz
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55ae6d1f3e
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[JS IR] Optimize pattern-matching of enums into comparing their ordinals
For this code:
```
enum class Season {
WINTER,
SPRING,
SUMMER,
AUTUMN
}
fun bar1(x : Season) : String {
return when (x) {
Season.WINTER, Season.SPRING -> "winter_spring"
Season.SUMMER -> "summer"
else -> "autumn"
}
}
```
previously we generated this:
```
function foo(x) {
var tmp0_subject = x;
return (tmp0_subject.equals(Season_WINTER_getInstance())
? true
: tmp0_subject.equals(Season_SPRING_getInstance()))
? 'winter_spring'
: tmp0_subject.equals(Season_SUMMER_getInstance())
? 'summer'
: 'autumn';
}
```
And now we generated this:
```
function bar2(x) {
var tmp0_subject = x;
var tmp0 = tmp0_subject._get_ordinal__0_k$();
var tmp;
switch (tmp0) {
case 0:
case 1:
tmp = 'winter_spring';
break;
case 2:
tmp = 'summer';
break;
case 3:
tmp = 'autumn';
break;
default:
noWhenBranchMatchedException();
break;
}
return tmp;
}
```
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2021-10-14 11:44:01 +00:00 |
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