1 files changed, 86 insertions, 0 deletions
diff --git a/test/opt_branchlikely.go b/test/opt_branchlikely.go
new file mode 100644
index 0000000..884c349
--- /dev/null
+++ b/test/opt_branchlikely.go
@@ -0,0 +1,86 @@
+// +build amd64
+// errorcheck -0 -d=ssa/likelyadjust/debug=1,ssa/insert_resched_checks/off
+// rescheduling check insertion is turned off because the inserted conditional branches perturb the errorcheck
+
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that branches have some prediction properties.
+package foo
+
+func f(x, y, z int) int {
+	a := 0
+	for i := 0; i < x; i++ { // ERROR "Branch prediction rule stay in loop"
+		for j := 0; j < y; j++ { // ERROR "Branch prediction rule stay in loop"
+			a += j
+		}
+		for k := 0; k < z; k++ { // ERROR "Branch prediction rule stay in loop"
+			a -= x + y + z
+		}
+	}
+	return a
+}
+
+func g(x, y, z int) int {
+	a := 0
+	if y == 0 { // ERROR "Branch prediction rule default < call"
+		y = g(y, z, x)
+	} else {
+		y++
+	}
+	if y == x { // ERROR "Branch prediction rule default < call"
+		y = g(y, z, x)
+	} else {
+	}
+	if y == 2 { // ERROR "Branch prediction rule default < call"
+		z++
+	} else {
+		y = g(z, x, y)
+	}
+	if y+z == 3 { // ERROR "Branch prediction rule call < exit"
+		println("ha ha")
+	} else {
+		panic("help help help")
+	}
+	if x != 0 { // ERROR "Branch prediction rule default < ret"
+		for i := 0; i < x; i++ { // ERROR "Branch prediction rule stay in loop"
+			if x == 4 { // ERROR "Branch prediction rule stay in loop"
+				return a
+			}
+			for j := 0; j < y; j++ { // ERROR "Branch prediction rule stay in loop"
+				for k := 0; k < z; k++ { // ERROR "Branch prediction rule stay in loop"
+					a -= j * i
+				}
+				a += j
+			}
+		}
+	}
+	return a
+}
+
+func h(x, y, z int) int {
+	a := 0
+	for i := 0; i < x; i++ { // ERROR "Branch prediction rule stay in loop"
+		for j := 0; j < y; j++ { // ERROR "Branch prediction rule stay in loop"
+			a += j
+			if i == j { // ERROR "Branch prediction rule stay in loop"
+				break
+			}
+			a *= j
+		}
+		for k := 0; k < z; k++ { // ERROR "Branch prediction rule stay in loop"
+			a -= k
+			if i == k {
+				continue
+			}
+			a *= k
+		}
+	}
+	if a > 0 { // ERROR "Branch prediction rule default < call"
+		a = g(x, y, z)
+	} else {
+		a = -a
+	}
+	return a
+}