Mads Ager
fb6eafddf1
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()
```
84 lines
1.2 KiB
Kotlin
Vendored
84 lines
1.2 KiB
Kotlin
Vendored
fun test1() : Boolean {
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try {
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return true
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} finally {
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if(true) // otherwise we wisely have unreachable code
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return false
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}
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}
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var x = true
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fun test2() : Boolean {
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try {
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} finally {
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x = false;
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}
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return x
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}
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fun test3() : Int {
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var y = 0
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try {
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++y
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} finally {
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++y
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}
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return y
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}
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var z = 0
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fun test4() : Int {
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z = 0
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return try {
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try {
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z++
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}
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finally {
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z++
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}
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} finally {
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++z
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}
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}
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fun test5() : Int {
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var x = 0
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while(true) {
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try {
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if(x < 10)
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x++
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else
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break
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}
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finally {
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x++
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}
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}
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return x
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}
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fun test6() : Int {
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var x = 0
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while(x < 10) {
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try {
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x++
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continue
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}
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finally {
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x++
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}
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}
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return x
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}
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fun box() : String {
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if(test1()) return "test1 failed"
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if(test2()) return "test2 failed"
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if(test3() != 2) return "test3 failed"
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if(test4() != 0) return "test4 failed"
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if(test5() != 11) return "test5 failed"
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if(test6() != 10) return "test6 failed"
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return "OK"
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}
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