runtime: remove duff support for riscv64

Change-Id: I987d9f49fbd2650eef4224f72271bf752c54d39c
Reviewed-on: https://go-review.googlesource.com/c/go/+/700538
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>

2 files changed, 0 insertions, 935 deletions

diff --git a/src/runtime/duff_riscv64.s b/src/runtime/duff_riscv64.s
deleted file mode 100644
index ec447677ad..0000000000
--- a/src/runtime/duff_riscv64.s
+++ /dev/null
@@ -1,907 +0,0 @@
-// Code generated by mkduff.go; DO NOT EDIT.
-// Run go generate from src/runtime to update.
-// See mkduff.go for comments.
-
-#include "textflag.h"
-
-TEXT runtime·duffzero<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-0
-	MOV	ZERO, (X25)
-	ADD	$8, X25
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-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
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-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	MOV	ZERO, (X25)
-	ADD	$8, X25
-	RET
-
-TEXT runtime·duffcopy<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-0
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	MOV	(X24), X31
-	ADD	$8, X24
-	MOV	X31, (X25)
-	ADD	$8, X25
-
-	RET
diff --git a/src/runtime/mkduff.go b/src/runtime/mkduff.go
index 75ff437f26..06d8251fae 100644
--- a/src/runtime/mkduff.go
+++ b/src/runtime/mkduff.go
@@ -36,7 +36,6 @@ func main() {
 	gen("arm", notags, zeroARM, copyARM)
 	gen("ppc64x", tagsPPC64x, zeroPPC64x, copyPPC64x)
 	gen("mips64x", tagsMIPS64x, zeroMIPS64x, copyMIPS64x)
-	gen("riscv64", notags, zeroRISCV64, copyRISCV64)
 }
 
 func gen(arch string, tags, zero, copy func(io.Writer)) {
@@ -230,30 +229,3 @@ func copyMIPS64x(w io.Writer) {
 	}
 	fmt.Fprintln(w, "\tRET")
 }
-
-func zeroRISCV64(w io.Writer) {
-	// ZERO: always zero
-	// X25: ptr to memory to be zeroed
-	// X25 is updated as a side effect.
-	fmt.Fprintln(w, "TEXT runtime·duffzero<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-0")
-	for i := 0; i < 128; i++ {
-		fmt.Fprintln(w, "\tMOV\tZERO, (X25)")
-		fmt.Fprintln(w, "\tADD\t$8, X25")
-	}
-	fmt.Fprintln(w, "\tRET")
-}
-
-func copyRISCV64(w io.Writer) {
-	// X24: ptr to source memory
-	// X25: ptr to destination memory
-	// X24 and X25 are updated as a side effect
-	fmt.Fprintln(w, "TEXT runtime·duffcopy<ABIInternal>(SB), NOSPLIT|NOFRAME, $0-0")
-	for i := 0; i < 128; i++ {
-		fmt.Fprintln(w, "\tMOV\t(X24), X31")
-		fmt.Fprintln(w, "\tADD\t$8, X24")
-		fmt.Fprintln(w, "\tMOV\tX31, (X25)")
-		fmt.Fprintln(w, "\tADD\t$8, X25")
-		fmt.Fprintln(w)
-	}
-	fmt.Fprintln(w, "\tRET")
-}