[src/trunk]: src/sys/lib/libkern/arch/arm Support thumb

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d1314f84875c
branches:  trunk
changeset: 789222:d1314f84875c
user:      matt <matt%NetBSD.org@localhost>
date:      Sun Aug 11 04:58:01 2013 +0000

description:
Support thumb

diffstat:

 sys/lib/libkern/arch/arm/clzsi2.S |  12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diffs (31 lines):

diff -r c45dd77436cb -r d1314f84875c sys/lib/libkern/arch/arm/clzsi2.S
--- a/sys/lib/libkern/arch/arm/clzsi2.S Sun Aug 11 04:56:32 2013 +0000
+++ b/sys/lib/libkern/arch/arm/clzsi2.S Sun Aug 11 04:58:01 2013 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: clzsi2.S,v 1.4 2012/09/01 11:24:36 matt Exp $ */
+/* $NetBSD: clzsi2.S,v 1.5 2013/08/11 04:58:01 matt Exp $ */
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -39,11 +39,21 @@
 #define        LO      r0
 #endif
 #if defined(_ARM_ARCH_5)
+#ifdef __thumb__
+       cmp     HI, #0
+       beq     1f
+       clz     r0, HI          /* count leading zeros in high word */
+       RET
+1:     clz     r0, LO          /* yes, count in low word */
+       add     r0, r0, #32     /*      and add the bits in the high word */
+       RET
+#else
        teq     HI, #0          /* high word all zero? */
        clzne   r0, HI          /* count leading zeros in high word */
        clzeq   r0, LO          /* yes, count in low word */
        addeq   r0, r0, #32     /*      and add the bits in the high word */
        RET
+#endif
 #else
        movs    r3, HI
        movne   r0, #31