From cbcf8efa5f749b4e5bceda8682070cd9cf84bee5 Mon Sep 17 00:00:00 2001
From: Keith Randall <khr@golang.org>
Date: Mon, 18 Sep 2023 13:31:49 -0700
Subject: cmd/compile: use cache in front of type assert runtime call
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That way we don't need to call into the runtime for every
type assertion (to an interface type).

name           old time/op  new time/op  delta
TypeAssert-24  3.78ns ± 3%  1.00ns ± 1%  -73.53%  (p=0.000 n=10+8)

Change-Id: I0ba308aaf0f24a5495b4e13c814d35af0c58bfde
Reviewed-on: https://go-review.googlesource.com/c/go/+/529316
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
---
 test/codegen/switch.go | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/codegen/switch.go')

diff --git a/test/codegen/switch.go b/test/codegen/switch.go
index 6778c65ab3..b0186ba5b7 100644
--- a/test/codegen/switch.go
+++ b/test/codegen/switch.go
@@ -139,3 +139,12 @@ func interfaceSwitch(x any) int {
 		return 3
 	}
 }
+
+func interfaceCast(x any) int {
+	// amd64:`CALL\truntime.typeAssert`,`MOVL\t16\(.*\)`,`MOVQ\t8\(.*\)(.*\*1)`
+	// arm64:`CALL\truntime.typeAssert`,`LDAR`,`MOVWU`,`MOVD\t\(R.*\)\(R.*\)`
+	if _, ok := x.(I); ok {
+		return 3
+	}
+	return 5
+}
-- 
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