1 files changed, 0 insertions, 45 deletions
diff --git a/src/cmd/compile/internal/ssa/rewrite.go b/src/cmd/compile/internal/ssa/rewrite.go
index 082aacd9c9..1c4815dc81 100644
--- a/src/cmd/compile/internal/ssa/rewrite.go
+++ b/src/cmd/compile/internal/ssa/rewrite.go
@@ -259,51 +259,6 @@ func isSamePtr(p1, p2 *Value) bool {
 	return false
 }
 
-func duffStartAMD64(size int64) int64 {
-	x, _ := duffAMD64(size)
-	return x
-}
-func duffAdjAMD64(size int64) int64 {
-	_, x := duffAMD64(size)
-	return x
-}
-
-// duff returns the offset (from duffzero, in bytes) and pointer adjust (in bytes)
-// required to use the duffzero mechanism for a block of the given size.
-func duffAMD64(size int64) (int64, int64) {
-	// DUFFZERO consists of repeated blocks of 4 MOVUPSs + ADD,
-	// See runtime/mkduff.go.
-	const (
-		dzBlocks    = 16 // number of MOV/ADD blocks
-		dzBlockLen  = 4  // number of clears per block
-		dzBlockSize = 19 // size of instructions in a single block
-		dzMovSize   = 4  // size of single MOV instruction w/ offset
-		dzAddSize   = 4  // size of single ADD instruction
-		dzClearStep = 16 // number of bytes cleared by each MOV instruction
-
-		dzTailLen  = 4 // number of final STOSQ instructions
-		dzTailSize = 2 // size of single STOSQ instruction
-
-		dzClearLen = dzClearStep * dzBlockLen // bytes cleared by one block
-		dzSize     = dzBlocks * dzBlockSize
-	)
-
-	if size < 32 || size > 1024 || size%dzClearStep != 0 {
-		panic("bad duffzero size")
-	}
-	steps := size / dzClearStep
-	blocks := steps / dzBlockLen
-	steps %= dzBlockLen
-	off := dzBlockSize * (dzBlocks - blocks)
-	var adj int64
-	if steps != 0 {
-		off -= dzAddSize
-		off -= dzMovSize * steps
-		adj -= dzClearStep * (dzBlockLen - steps)
-	}
-	return off, adj
-}
-
 // moveSize returns the number of bytes an aligned MOV instruction moves
 func moveSize(align int64, c *Config) int64 {
 	switch {