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/cmpdi2.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/cmpdi2.S')
| -rw-r--r-- | arch/metag/lib/cmpdi2.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/metag/lib/cmpdi2.S b/arch/metag/lib/cmpdi2.S new file mode 100644 index 000000000000..9c5c663c5aea --- /dev/null +++ b/arch/metag/lib/cmpdi2.S @@ -0,0 +1,32 @@ +! Copyright (C) 2012 by Imagination Technologies Ltd. +! +! 64-bit signed compare routine. +! + + .text + .global ___cmpdi2 + .type ___cmpdi2,function + +! low high +! s64 a (D0Ar2, D1Ar1) +! s64 b (D0Ar4, D1Ar3) +___cmpdi2: + ! start at 1 (equal) and conditionally increment or decrement + MOV D0Re0,#1 + + ! high words differ? + CMP D1Ar1,D1Ar3 + BNE $Lhigh_differ + + ! unsigned compare low words + CMP D0Ar2,D0Ar4 + SUBLO D0Re0,D0Re0,#1 + ADDHI D0Re0,D0Re0,#1 + MOV PC,D1RtP + +$Lhigh_differ: + ! signed compare high words + SUBLT D0Re0,D0Re0,#1 + ADDGT D0Re0,D0Re0,#1 + MOV PC,D1RtP + .size ___cmpdi2,.-___cmpdi2 |