Add some missing 64-bit math functions for gcc

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9715 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/CompilerIntrinsicsLib/Arm/ctzsi2.S

@@ -0,0 +1,51 @@
+#------------------------------------------------------------------------------ 
+#
+# Copyright (c) 2008-2010 Apple Inc. All rights reserved.
+#
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+	.text
+	.align 2
+	.globl ___ctzsi2
+___ctzsi2:
+	@ args = 0, pretend = 0, frame = 0
+	@ frame_needed = 0, uses_anonymous_args = 0
+	@ link register save eliminated.
+	uxth	r3, r0
+	cmp	r3, #0
+	moveq	ip, #16
+	movne	ip, #0
+	@ lr needed for prologue
+	mov	r0, r0, lsr ip
+	tst	r0, #255
+	movne	r3, #0
+	moveq	r3, #8
+	mov	r0, r0, lsr r3
+	tst	r0, #15
+	movne	r1, #0
+	moveq	r1, #4
+	add	r3, r3, ip
+	mov	r0, r0, lsr r1
+	tst	r0, #3
+	movne	r2, #0
+	moveq	r2, #2
+	add	r3, r3, r1
+	mov	r0, r0, lsr r2
+	and	r0, r0, #3
+	add	r2, r3, r2
+	eor	r3, r0, #1
+	mov	r0, r0, lsr #1
+	ands	r3, r3, #1
+	mvnne	r3, #0
+	rsb	r0, r0, #2
+	and	r0, r3, r0
+	add	r0, r2, r0
+	bx	lr