Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / lib / ucmpdi2.S

diff --git a/kernel/arch/metag/lib/ucmpdi2.S b/kernel/arch/metag/lib/ucmpdi2.S
new file mode 100644 (file)
index 0000000..6f3347f
--- /dev/null
+++ b/kernel/arch/metag/lib/ucmpdi2.S
@@ -0,0 +1,27 @@
+! Copyright (C) 2012 by Imagination Technologies Ltd.
+!
+! 64-bit unsigned compare routine.
+!
+
+       .text
+       .global ___ucmpdi2
+       .type   ___ucmpdi2,function
+
+!         low    high
+! u64 a  (D0Ar2, D1Ar1)
+! u64 b  (D0Ar4, D1Ar3)
+___ucmpdi2:
+       ! start at 1 (equal) and conditionally increment or decrement
+       MOV     D0Re0,#1
+
+       ! high words
+       CMP     D1Ar1,D1Ar3
+       ! or if equal, low words
+       CMPEQ   D0Ar2,D0Ar4
+
+       ! unsigned compare
+       SUBLO   D0Re0,D0Re0,#1
+       ADDHI   D0Re0,D0Re0,#1
+
+       MOV     PC,D1RtP
+       .size ___ucmpdi2,.-___ucmpdi2