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baf1f56859
The JVM IR backend code seems saner to me. The string concatenation lowering for JVM IR calls the stringPlus intrinsic if there are only two arguments. That leads to a lot less code: ``` load string load argument box argument call Intrinsics.stringPlus ``` instead of ``` allocate StringBuilder call StringBuilder.<init> load string call StringBuilder.append load argument call StringBuilder.append call StringBuilder.toString ``` This will lead to more boxing, but a lot smaller code. We still use StringBuilders in JVM IR if there are more than two strings being concatenated.
52 lines
1.3 KiB
Kotlin
Vendored
52 lines
1.3 KiB
Kotlin
Vendored
// FILE: list.kt
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val intList = listOf(1, 2, 3)
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val longList = listOf(1L, 2L, 3L)
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// FILE: box.kt
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fun box(): String {
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val intListMin = intList.minBy { it } ?: -1
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if (intListMin != 1) return "Fail intListMin=$intListMin"
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val intListMax = intList.maxBy { it } ?: -1
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if (intListMax != 3) return "Fail intListMax=$intListMax"
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val longListMin = longList.minBy { it } ?: -1
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if (longListMin != 1L) return "Fail longListMin=$longListMin"
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val longListMax = longList.maxBy { it } ?: -1
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if (longListMax != 3L) return "Fail longListMax=$longListMax"
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return "OK"
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}
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// @BoxKt.class:
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// -- no compareTo
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// 0 compareTo
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// -- comparisons are properly fused with conditional jumps
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// comparisons: 0 + fake inline variables: 12
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// 12 ICONST_0
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// 1 IF_ICMPGE
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// 1 IF_ICMPLE
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// 4 LCMP
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// 1 IFGE
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// 1 IFLE
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// JVM_TEMPLATES
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// -- no boxing but lots of StringBuilder calls
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// 0 valueOf
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// 0 Intrinsics.stringPlus
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// 4 StringBuilder.<init>
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// 8 StringBuilder.append
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// 4 StringBuilder.toString
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// JVM_IR_TEMPLATES
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// -- perform boxing and call Intrinsics.stringPlus instead
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// -- of having inlined string builder allocation, appends, and toString
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// 4 valueOf
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// 4 Intrinsics.stringPlus
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// 0 StringBuilder.<init>
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// 0 StringBuilder.append
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// 0 StringBuilder.toString
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