From: Russ Cox <rsc@golang.org>
Date: Tue, 10 Apr 2012 14:09:27 +0000 (-0400)
Subject: 8a, 8l: add PREFETCH instructions
X-Git-Tag: go1.1rc2~3412
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=3d462449f670e2c0a810a6ef3bfc732a117f3cf7;p=gostls13.git

8a, 8l: add PREFETCH instructions

R=ken2
CC=golang-dev
https://golang.org/cl/5992082
---

diff --git a/src/cmd/8a/lex.c b/src/cmd/8a/lex.c
index c54e4fe462..5d361f53c5 100644
--- a/src/cmd/8a/lex.c
+++ b/src/cmd/8a/lex.c
@@ -667,6 +667,10 @@ struct
 	"MFENCE",	LTYPE0, AMFENCE,
 	"SFENCE",	LTYPE0, ASFENCE,
 	"EMMS",		LTYPE0, AEMMS,
+	"PREFETCHT0",		LTYPE2,	APREFETCHT0,
+	"PREFETCHT1",		LTYPE2,	APREFETCHT1,
+	"PREFETCHT2",		LTYPE2,	APREFETCHT2,
+	"PREFETCHNTA",		LTYPE2,	APREFETCHNTA,
 
 	0
 };
diff --git a/src/cmd/8l/8.out.h b/src/cmd/8l/8.out.h
index 9d2751cf0a..e13f1d3454 100644
--- a/src/cmd/8l/8.out.h
+++ b/src/cmd/8l/8.out.h
@@ -451,6 +451,11 @@ enum	as
 	ASFENCE,
 
 	AEMMS,
+	
+	APREFETCHT0,
+	APREFETCHT1,
+	APREFETCHT2,
+	APREFETCHNTA,
 
 	ALAST
 };
diff --git a/src/cmd/8l/optab.c b/src/cmd/8l/optab.c
index 856482290d..bb2e4705a5 100644
--- a/src/cmd/8l/optab.c
+++ b/src/cmd/8l/optab.c
@@ -349,6 +349,11 @@ uchar	ysvrs[] =
 	Ym,	Ynone,	Zm_o,	2,
 	0
 };
+uchar	yprefetch[] =
+{
+	Ym,	Ynone,	Zm_o,	2,
+	0,
+};
 
 Optab optab[] =
 /*	as, ytab, andproto, opcode */
@@ -761,5 +766,10 @@ Optab optab[] =
 
 	{ AEMMS, ynone, Pm, 0x77 },
 
+	{ APREFETCHT0,	yprefetch,	Pm,	0x18,(01) },
+	{ APREFETCHT1,	yprefetch,	Pm,	0x18,(02) },
+	{ APREFETCHT2,	yprefetch,	Pm,	0x18,(03) },
+	{ APREFETCHNTA,	yprefetch,	Pm,	0x18,(00) },
+
 	0
 };
diff --git a/src/pkg/runtime/asm_386.s b/src/pkg/runtime/asm_386.s
index 3ab34d34cb..f3de78cbb9 100644
--- a/src/pkg/runtime/asm_386.s
+++ b/src/pkg/runtime/asm_386.s
@@ -417,8 +417,7 @@ TEXT runtime·atomicstore64(SB), 7, $0
 
 TEXT runtime·prefetch(SB), 7, $0
 	MOVL    4(SP), AX
-	// PREFETCHNTA (AX)
-	BYTE $0x0f; BYTE $0x18; BYTE $0x00
+	PREFETCHNTA (AX)
 	RET
 
 // void jmpdefer(fn, sp);