Module Name: src
Committed By: macallan
Date: Wed Jun 12 20:43:22 UTC 2013
Modified Files:
src/sys/arch/sparc/dev: sxreg.h
Log Message:
document arithmetics instructions
To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/sparc/dev/sxreg.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/sparc/dev/sxreg.h
diff -u src/sys/arch/sparc/dev/sxreg.h:1.8 src/sys/arch/sparc/dev/sxreg.h:1.9
--- src/sys/arch/sparc/dev/sxreg.h:1.8 Wed Jun 12 04:23:46 2013
+++ src/sys/arch/sparc/dev/sxreg.h Wed Jun 12 20:43:21 2013
@@ -1,4 +1,4 @@
-/* $NetBSD: sxreg.h,v 1.8 2013/06/12 04:23:46 macallan Exp $ */
+/* $NetBSD: sxreg.h,v 1.9 2013/06/12 20:43:21 macallan Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -253,14 +253,15 @@
((sa) << 14) | ((d) << 7) | (sb))
/* arithmetic group */
-#define SX_ADD_V (0x00 << 21)
-#define SX_ADD_S (0x01 << 21)
-#define SX_ADD_I (0x02 << 21)
-#define SX_SUM (0x03 << 21)
-#define SX_SUB_V (0x04 << 21)
-#define SX_SUB_S (0x05 << 21)
-#define SX_SUB_I (0x06 << 21)
-#define SX_ABS (0x07 << 21)
+#define SX_ADD_V (0x00 << 21) /* vector + vector */
+#define SX_ADD_S (0x01 << 21) /* vector + scalar */
+#define SX_ADD_I (0x02 << 21) /* vector + immediate */
+#define SX_SUM (0x03 << 21) /* sum of vector and scalar */
+#define SX_SUB_V (0x04 << 21) /* vector - veector */
+#define SX_SUB_S (0x05 << 21) /* vector - scalar */
+#define SX_SUB_I (0x06 << 21) /* vector - immediate */
+#define SX_ABS (0x07 << 21) /* abs(sb) with sa=R0 */
+/* hardware does sa - sb for sb < 0 and sa + sb if sb > 0 */
#define SX_ADDV(sa, sb, d, cnt) (0xa0000000 | ((cnt) << 24) | SX_ADD_V | \
((sa) << 14) | ((d) << 7) | (sb))
