From: Srinivas Pokala <Pokala.Srinivas@ibm.com>
Date: Tue, 11 Nov 2025 04:22:32 +0000 (+0100)
Subject: runtime: port memmove, memclr to register ABI on s390x
X-Git-Tag: go1.26rc1~153
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=4529c8fba65bf2c80e3bd4dac0851451a101c936;p=gostls13.git

runtime: port memmove, memclr to register ABI on s390x

This allows memmove and memclr to be invoked using the new
register ABI on s390x.

Update #40724

Change-Id: I2e799aac693ddd693266c156c525d6303060796f
Reviewed-on: https://go-review.googlesource.com/c/go/+/719424
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Vishwanatha HD <vishwanatha.hd@ibm.com>
Reviewed-by: Keith Randall <khr@google.com>
---

diff --git a/src/runtime/memclr_s390x.s b/src/runtime/memclr_s390x.s
index 392057565e..919423edf7 100644
--- a/src/runtime/memclr_s390x.s
+++ b/src/runtime/memclr_s390x.s
@@ -7,10 +7,14 @@
 // See memclrNoHeapPointers Go doc for important implementation constraints.
 
 // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
-TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT|NOFRAME,$0-16
+TEXT runtime·memclrNoHeapPointers<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	ptr+0(FP), R4
 	MOVD	n+8(FP), R5
-
+#else
+	MOVD	R2, R4
+	MOVD	R3, R5
+#endif
 	CMPBGE	R5, $32, clearge32
 
 start:
diff --git a/src/runtime/memmove_s390x.s b/src/runtime/memmove_s390x.s
index f4c2b87d92..28c6a5dab2 100644
--- a/src/runtime/memmove_s390x.s
+++ b/src/runtime/memmove_s390x.s
@@ -7,10 +7,16 @@
 // See memmove Go doc for important implementation constraints.
 
 // func memmove(to, from unsafe.Pointer, n uintptr)
-TEXT runtime·memmove(SB),NOSPLIT|NOFRAME,$0-24
+TEXT runtime·memmove<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-24
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	to+0(FP), R6
 	MOVD	from+8(FP), R4
 	MOVD	n+16(FP), R5
+#else
+	MOVD	R4, R5
+	MOVD	R3, R4
+	MOVD	R2, R6
+#endif
 
 	CMPBEQ	R6, R4, done