diff options
Diffstat (limited to 'arch/metag/lib/memset.S')
| -rw-r--r-- | arch/metag/lib/memset.S | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/arch/metag/lib/memset.S b/arch/metag/lib/memset.S deleted file mode 100644 index 6ee246d..0000000 --- a/arch/metag/lib/memset.S +++ /dev/null @@ -1,87 +0,0 @@ -! 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 - |
