diff --git a/src/cmd/compile/internal/ssa/rewrite.go b/src/cmd/compile/internal/ssa/rewrite.go
index 71b8f09daf..45eb48ad63 100644
--- a/src/cmd/compile/internal/ssa/rewrite.go
+++ b/src/cmd/compile/internal/ssa/rewrite.go
@@ -1371,7 +1371,7 @@ func isInlinableMemclr(c *Config, sz int64) bool {
 	switch c.arch {
 	case "amd64", "arm64":
 		return true
-	case "ppc64le", "ppc64":
+	case "ppc64le", "ppc64", "loong64":
 		return sz < 512
 	}
 	return false
diff --git a/test/codegen/slices.go b/test/codegen/slices.go
index a38fe77e3f..9e8990c586 100644
--- a/test/codegen/slices.go
+++ b/test/codegen/slices.go
@@ -47,6 +47,7 @@ func SliceExtensionConst(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -58,6 +59,7 @@ func SliceExtensionConstInt64(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -69,6 +71,7 @@ func SliceExtensionConstUint64(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -80,16 +83,18 @@ func SliceExtensionConstUint(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
 	return append(s, make([]int, uint(1<<2))...)
 }
 
-// On ppc64x continue to use memclrNoHeapPointers
+// On ppc64x and loong64 continue to use memclrNoHeapPointers
 // for sizes >= 512.
 func SliceExtensionConst512(s []int) []int {
 	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// loong64:`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:`.*runtime\.memclrNoHeapPointers`
 	return append(s, make([]int, 1<<9)...)
 }