Remove branching in while loop

nicolasstucki · odersky · commit 3c672e0dc817 · 2018-08-07T19:18:43.000+02:00
diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TastyPickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/TastyPickler.scala
@@ -89,10 +89,8 @@ class TastyPickler(val rootCls: ClassSymbol) {
       val d = data(i) & 0xFFL // Interpret byte as unsigned byte
       h = (h << 8) + d
       val high = h & 0xFF00000000000000L
-      if (high != 0) {
-        h ^= high >> 48L
-        h &= ~high
-      }
+      h ^= high >> 48L
+      h &= ~high
       i += 1
     }
     h

Original file line number	Diff line number	Diff line change
`@@ -89,10 +89,8 @@ class TastyPickler(val rootCls: ClassSymbol) {`
`89`	`89`	`val d = data(i) & 0xFFL // Interpret byte as unsigned byte`
`90`	`90`	`h = (h << 8) + d`
`91`	`91`	`val high = h & 0xFF00000000000000L`
`92`		`- if (high != 0) {`
`93`		`- h ^= high >> 48L`
`94`		`- h &= ~high`
`95`		`- }`
	`92`	`+ h ^= high >> 48L`
	`93`	`+ h &= ~high`
`96`	`94`	`i += 1`
`97`	`95`	`}`
`98`	`96`	`h`