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Diffstat (limited to 'arch/metag/lib/ashrdi3.S')
| -rw-r--r-- | arch/metag/lib/ashrdi3.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/metag/lib/ashrdi3.S b/arch/metag/lib/ashrdi3.S new file mode 100644 index 00000000000..7cb7ed3bb1a --- /dev/null +++ b/arch/metag/lib/ashrdi3.S @@ -0,0 +1,33 @@ +! Copyright (C) 2012 by Imagination Technologies Ltd. +! +! 64-bit arithmetic shift right routine. +! + + .text + .global ___ashrdi3 + .type ___ashrdi3,function + +___ashrdi3: + 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 $L20 + +!! Shift < 32 + NEG D1Ar3,D1Ar3 ! N = - N + LSR D0Re0,D0Re0,D0Ar4 ! LO = LO >> COUNT + LSL D0Ar6,D1Re0,D1Ar3 ! TMP= HI << -(COUNT - 32) + OR D0Re0,D0Re0,D0Ar6 ! LO = LO | TMP + SWAP D1Ar3,D0Ar4 + ASR D1Re0,D1Re0,D1Ar3 ! HI = HI >> COUNT + MOV PC,D1RtP +$L20: +!! Shift >= 32 + ASR D0Re0,D1Re0,D1Ar3 ! LO = HI >> N + ASR D1Re0,D1Re0,#31 ! HI = HI >> 31 + MOV PC,D1RtP + .size ___ashrdi3,.-___ashrdi3 |