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-rw-r--r--arch/metag/lib/memset.S87
1 files changed, 0 insertions, 87 deletions
diff --git a/arch/metag/lib/memset.S b/arch/metag/lib/memset.S
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-! SPDX-License-Identifier: GPL-2.0
-! Copyright (C) 2008-2012 Imagination Technologies Ltd.
-
- .text
- .global _memset
- .type _memset,function
-! D1Ar1 dst
-! D0Ar2 c
-! D1Ar3 cnt
-! D0Re0 dst
-_memset:
- AND D0Ar2,D0Ar2,#0xFF ! Ensure a byte input value
- MULW D0Ar2,D0Ar2,#0x0101 ! Duplicate byte value into 0-15
- ANDS D0Ar4,D1Ar1,#7 ! Extract bottom LSBs of dst
- LSL D0Re0,D0Ar2,#16 ! Duplicate byte value into 16-31
- ADD A0.2,D0Ar2,D0Re0 ! Duplicate byte value into 4 (A0.2)
- MOV D0Re0,D1Ar1 ! Return dst
- BZ $LLongStub ! if start address is aligned
- ! start address is not aligned on an 8 byte boundary, so we
- ! need the number of bytes up to the next 8 byte address
- ! boundary, or the length of the string if less than 8, in D1Ar5
- MOV D0Ar2,#8 ! Need 8 - N in D1Ar5 ...
- SUB D1Ar5,D0Ar2,D0Ar4 ! ... subtract N
- CMP D1Ar3,D1Ar5
- MOVMI D1Ar5,D1Ar3
- B $LByteStub ! dst is mis-aligned, do $LByteStub
-
-!
-! Preamble to LongLoop which generates 4*8 bytes per interation (5 cycles)
-!
-$LLongStub:
- LSRS D0Ar2,D1Ar3,#5
- AND D1Ar3,D1Ar3,#0x1F
- MOV A1.2,A0.2
- BEQ $LLongishStub
- SUB TXRPT,D0Ar2,#1
- CMP D1Ar3,#0
-$LLongLoop:
- SETL [D1Ar1++],A0.2,A1.2
- SETL [D1Ar1++],A0.2,A1.2
- SETL [D1Ar1++],A0.2,A1.2
- SETL [D1Ar1++],A0.2,A1.2
- BR $LLongLoop
- BZ $Lexit
-!
-! Preamble to LongishLoop which generates 1*8 bytes per interation (2 cycles)
-!
-$LLongishStub:
- LSRS D0Ar2,D1Ar3,#3
- AND D1Ar3,D1Ar3,#0x7
- MOV D1Ar5,D1Ar3
- BEQ $LByteStub
- SUB TXRPT,D0Ar2,#1
- CMP D1Ar3,#0
-$LLongishLoop:
- SETL [D1Ar1++],A0.2,A1.2
- BR $LLongishLoop
- BZ $Lexit
-!
-! This does a byte structured burst of up to 7 bytes
-!
-! D1Ar1 should point to the location required
-! D1Ar3 should be the remaining total byte count
-! D1Ar5 should be burst size (<= D1Ar3)
-!
-$LByteStub:
- SUBS D1Ar3,D1Ar3,D1Ar5 ! Reduce count
- ADD D1Ar1,D1Ar1,D1Ar5 ! Advance pointer to end of area
- MULW D1Ar5,D1Ar5,#4 ! Scale to (1*4), (2*4), (3*4)
- SUB D1Ar5,D1Ar5,#(8*4) ! Rebase to -(7*4), -(6*4), -(5*4), ...
- MOV A1.2,D1Ar5
- SUB PC,CPC1,A1.2 ! Jump into table below
- SETB [D1Ar1+#(-7)],A0.2
- SETB [D1Ar1+#(-6)],A0.2
- SETB [D1Ar1+#(-5)],A0.2
- SETB [D1Ar1+#(-4)],A0.2
- SETB [D1Ar1+#(-3)],A0.2
- SETB [D1Ar1+#(-2)],A0.2
- SETB [D1Ar1+#(-1)],A0.2
-!
-! Return if all data has been output, otherwise do $LLongStub
-!
- BNZ $LLongStub
-$Lexit:
- MOV PC,D1RtP
- .size _memset,.-_memset
-