kotlin/compiler/testData/codegen/bytecodeText/deadCodeElimination/kt14357.kt at 7b153b2b689fe79b96ec6ce1aa71c3d3f0447621 - kotlin - Gitea: Git with a cup of tea

jlengrand/kotlin

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Mads Ager fb6eafddf1 JVM_IR: Generate better code for null checks.

Simplify ifs when branches have condition true/false.

Simplify blocks containing only a variable declaration
and a variable get of the same variable. Simplify to
just the condition.

Do not introduce temporary variables for constants for
null checks. Constants have no side-effects and can be
reloaded freely instead of going through a local.

This simplifies code such as "42.toLong()!!" so that the
resulting code has no branches and uses no locals. The
simplifications happen as follows:

```
block
  temp = 42.toLong()
  when
    (temp == null) throw NPE
    (true) load temp

---> null test simplification

block
  temp = 42.toLong()
  when
    (false) throw NPE
    (true) load temp

---> when simplification

block
  temp = 42.toLong()
  load temp

---> block simplification

42.toLong()
```

2019-01-23 15:11:14 +01:00

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 fun test() {
     if (false) {
         try {
             println("Hello Kotlin")
         } catch (e: Exception) {
             e.printStackTrace()
         }
     }
 }
 // 0 INVOKE