cmd/8c: disable use of prefetch with GO386=387

rsc · rsc · commit 594360cb1b31 · 2013-02-13T21:13:07.000-05:00
Fixes #4798. R=ken2 CC=golang-dev https://golang.org/cl/7323061
diff --git a/src/cmd/8c/txt.c b/src/cmd/8c/txt.c
@@ -1396,6 +1396,9 @@ gprefetch(Node *n)
 {
 	Node n1;
 	
+	if(strcmp(getgo386(), "sse2") != 0) // assume no prefetch on old machines
+		return;
+
 	regalloc(&n1, n, Z);
 	gmove(n, &n1);
 	n1.op = OINDREG;

Original file line number	Diff line number	Diff line change
`@@ -1396,6 +1396,9 @@ gprefetch(Node *n)`
`1396`	`1396`	`{`
`1397`	`1397`	`Node n1;`
`1398`	`1398`
	`1399`	`+ if(strcmp(getgo386(), "sse2") != 0) // assume no prefetch on old machines`
	`1400`	`+ return;`
	`1401`	`+`
`1399`	`1402`	`regalloc(&n1, n, Z);`
`1400`	`1403`	`gmove(n, &n1);`
`1401`	`1404`	`n1.op = OINDREG;`