diff options
| author | James Hogan <james.hogan@imgtec.com> | 2012-10-05 17:02:09 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:09:52 +0000 |
| commit | 086e9dc0e2ca925b1b58caefd04ed2757d14790b (patch) | |
| tree | cfe182f1d07d40d09d2cae09e337423462250cac /arch/metag/lib/lshrdi3.S | |
| parent | f507758ccbed5c354cc1ce3b8f53ea072d7bc222 (diff) | |
metag: Optimised library functions
Add optimised library functions for metag.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'arch/metag/lib/lshrdi3.S')
| -rw-r--r-- | arch/metag/lib/lshrdi3.S | 33 |
1 files changed, 33 insertions, 0 deletions
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 |