From 086e9dc0e2ca925b1b58caefd04ed2757d14790b Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 5 Oct 2012 17:02:09 +0100
Subject: metag: Optimised library functions

Add optimised library functions for metag.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
---
 arch/metag/lib/lshrdi3.S | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 arch/metag/lib/lshrdi3.S

(limited to 'arch/metag/lib/lshrdi3.S')

diff --git a/arch/metag/lib/lshrdi3.S b/arch/metag/lib/lshrdi3.S
new file mode 100644
index 00000000000..47f72028307
--- /dev/null
+++ b/arch/metag/lib/lshrdi3.S
@@ -0,0 +1,33 @@
+! Copyright (C) 2012 by Imagination Technologies Ltd.
+!
+! 64-bit logical shift right routine.
+!
+
+	.text
+	.global ___lshrdi3
+	.type   ___lshrdi3,function
+
+___lshrdi3:
+	MOV     D0Re0,D0Ar2
+	MOV     D1Re0,D1Ar1
+	CMP     D1Ar3,#0                ! COUNT == 0
+	MOVEQ   PC,D1RtP                ! Yes, return
+
+	MOV     D0Ar4,D1Ar3
+	SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
+	BGE     $L30
+
+!! Shift < 32
+	NEG     D1Ar3,D1Ar3             ! N = - N
+	LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
+	LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
+	OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
+	SWAP    D1Ar3,D0Ar4
+	LSR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
+	MOV     PC,D1RtP
+$L30:
+!! Shift >= 32
+	LSR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
+	MOV     D1Re0,#0                ! HI = 0
+	MOV     PC,D1RtP
+	.size ___lshrdi3,.-___lshrdi3
-- 
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