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-rw-r--r--powerpc-cpu/sysdeps/powerpc/powerpc32/power4/memcpy.S425
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diff --git a/powerpc-cpu/sysdeps/powerpc/powerpc32/power4/memcpy.S b/powerpc-cpu/sysdeps/powerpc/powerpc32/power4/memcpy.S
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index c48db2f3df..0000000000
--- a/powerpc-cpu/sysdeps/powerpc/powerpc32/power4/memcpy.S
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@@ -1,425 +0,0 @@
-/* Optimized memcpy implementation for PowerPC32 on PowerPC64.
- Copyright (C) 2003, 2006 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
- 02110-1301 USA. */
-
-#include <sysdep.h>
-#include <bp-sym.h>
-#include <bp-asm.h>
-
-/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
- Returns 'dst'.
-
- Memcpy handles short copies (< 32-bytes) using a binary move blocks
- (no loops) of lwz/stw. The tail (remaining 1-3) bytes is handled
- with the appropriate combination of byte and halfword load/stores.
- There is minimal effort to optimize the alignment of short moves.
-
- Longer moves (>= 32-bytes) justify the effort to get at least the
- destination word (4-byte) aligned. Further optimization is
- possible when both source and destination are word aligned.
- Each case has an optimized unrolled loop. */
-
-EALIGN (BP_SYM (memcpy), 5, 0)
- CALL_MCOUNT
-
- stwu 1,-32(1)
- cfi_adjust_cfa_offset(32)
- stw 30,20(1)
- cfi_offset(30,(20-32))
- mr 30,3
- cmplwi cr1,5,31
- stw 31,24(1)
- cfi_offset(31,(24-32))
- neg 0,3
- andi. 11,3,3 /* check alignment of dst. */
- clrlwi 0,0,30 /* Number of bytes until the 1st word of dst. */
- clrlwi 10,4,30 /* check alignment of src. */
- cmplwi cr6,5,8
- ble- cr1,.L2 /* If move < 32 bytes use short move code. */
- cmplw cr6,10,11
- mr 12,4
- srwi 9,5,2 /* Number of full words remaining. */
- mtcrf 0x01,0
- mr 31,5
- beq .L0
-
- subf 31,0,5
- /* Move 0-3 bytes as needed to get the destination word aligned. */
-1: bf 31,2f
- lbz 6,0(12)
- addi 12,12,1
- stb 6,0(3)
- addi 3,3,1
-2: bf 30,0f
- lhz 6,0(12)
- addi 12,12,2
- sth 6,0(3)
- addi 3,3,2
-0:
- clrlwi 10,12,30 /* check alignment of src again. */
- srwi 9,31,2 /* Number of full words remaining. */
-
- /* Copy words from source to destination, assuming the destination is
- aligned on a word boundary.
-
- At this point we know there are at least 25 bytes left (32-7) to copy.
- The next step is to determine if the source is also word aligned.
- If not branch to the unaligned move code at .L6. which uses
- a load, shift, store strategy.
-
- Otherwise source and destination are word aligned, and we can use
- the optimized word copy loop. */
-.L0:
- clrlwi 11,31,30 /* calculate the number of tail bytes */
- mtcrf 0x01,9
- bne- cr6,.L6 /* If source is not word aligned. */
-
- /* Move words where destination and source are word aligned.
- Use an unrolled loop to copy 4 words (16-bytes) per iteration.
- If the the copy is not an exact multiple of 16 bytes, 1-3
- words are copied as needed to set up the main loop. After
- the main loop exits there may be a tail of 1-3 bytes. These bytes are
- copied a halfword/byte at a time as needed to preserve alignment. */
-
- srwi 8,31,4 /* calculate the 16 byte loop count */
- cmplwi cr1,9,4
- cmplwi cr6,11,0
- mr 11,12
-
- bf 30,1f
- lwz 6,0(12)
- lwz 7,4(12)
- addi 11,12,8
- mtctr 8
- stw 6,0(3)
- stw 7,4(3)
- addi 10,3,8
- bf 31,4f
- lwz 0,8(12)
- stw 0,8(3)
- blt cr1,3f
- addi 11,12,12
- addi 10,3,12
- b 4f
- .align 4
-1:
- mr 10,3
- mtctr 8
- bf 31,4f
- lwz 6,0(12)
- addi 11,12,4
- stw 6,0(3)
- addi 10,3,4
-
- .align 4
-4:
- lwz 6,0(11)
- lwz 7,4(11)
- lwz 8,8(11)
- lwz 0,12(11)
- stw 6,0(10)
- stw 7,4(10)
- stw 8,8(10)
- stw 0,12(10)
- addi 11,11,16
- addi 10,10,16
- bdnz 4b
-3:
- clrrwi 0,31,2
- mtcrf 0x01,31
- beq cr6,0f
-.L9:
- add 3,3,0
- add 12,12,0
-
-/* At this point we have a tail of 0-3 bytes and we know that the
- destination is word aligned. */
-2: bf 30,1f
- lhz 6,0(12)
- addi 12,12,2
- sth 6,0(3)
- addi 3,3,2
-1: bf 31,0f
- lbz 6,0(12)
- stb 6,0(3)
-0:
- /* Return original dst pointer. */
- mr 3,30
- lwz 30,20(1)
- lwz 31,24(1)
- addi 1,1,32
- blr
-
-/* Copy up to 31 bytes. This is divided into two cases 0-8 bytes and
- 9-31 bytes. Each case is handled without loops, using binary
- (1,2,4,8) tests.
-
- In the short (0-8 byte) case no attempt is made to force alignment
- of either source or destination. The hardware will handle the
- unaligned load/stores with small delays for crossing 32- 64-byte, and
- 4096-byte boundaries. Since these short moves are unlikely to be
- unaligned or cross these boundaries, the overhead to force
- alignment is not justified.
-
- The longer (9-31 byte) move is more likely to cross 32- or 64-byte
- boundaries. Since only loads are sensitive to the 32-/64-byte
- boundaries it is more important to align the source than the
- destination. If the source is not already word aligned, we first
- move 1-3 bytes as needed. While the destination and stores may
- still be unaligned, this is only an issue for page (4096 byte
- boundary) crossing, which should be rare for these short moves.
- The hardware handles this case automatically with a small delay. */
-
- .align 4
-.L2:
- mtcrf 0x01,5
- neg 8,4
- clrrwi 11,4,2
- andi. 0,8,3
- ble cr6,.LE8 /* Handle moves of 0-8 bytes. */
-/* At least 9 bytes left. Get the source word aligned. */
- cmplwi cr1,5,16
- mr 10,5
- mr 12,4
- cmplwi cr6,0,2
- beq .L3 /* If the source is already word aligned skip this. */
-/* Copy 1-3 bytes to get source address word aligned. */
- lwz 6,0(11)
- subf 10,0,5
- add 12,4,0
- blt cr6,5f
- srwi 7,6,16
- bgt cr6,3f
- sth 6,0(3)
- b 7f
- .align 4
-3:
- stb 7,0(3)
- sth 6,1(3)
- b 7f
- .align 4
-5:
- stb 6,0(3)
-7:
- cmplwi cr1,10,16
- add 3,3,0
- mtcrf 0x01,10
- .align 4
-.L3:
-/* At least 6 bytes left and the source is word aligned. */
- blt cr1,8f
-16: /* Move 16 bytes. */
- lwz 6,0(12)
- lwz 7,4(12)
- stw 6,0(3)
- lwz 6,8(12)
- stw 7,4(3)
- lwz 7,12(12)
- addi 12,12,16
- stw 6,8(3)
- stw 7,12(3)
- addi 3,3,16
-8: /* Move 8 bytes. */
- bf 28,4f
- lwz 6,0(12)
- lwz 7,4(12)
- addi 12,12,8
- stw 6,0(3)
- stw 7,4(3)
- addi 3,3,8
-4: /* Move 4 bytes. */
- bf 29,2f
- lwz 6,0(12)
- addi 12,12,4
- stw 6,0(3)
- addi 3,3,4
-2: /* Move 2-3 bytes. */
- bf 30,1f
- lhz 6,0(12)
- sth 6,0(3)
- bf 31,0f
- lbz 7,2(12)
- stb 7,2(3)
- mr 3,30
- lwz 30,20(1)
- addi 1,1,32
- blr
-1: /* Move 1 byte. */
- bf 31,0f
- lbz 6,0(12)
- stb 6,0(3)
-0:
- /* Return original dst pointer. */
- mr 3,30
- lwz 30,20(1)
- addi 1,1,32
- blr
-
-/* Special case to copy 0-8 bytes. */
- .align 4
-.LE8:
- mr 12,4
- bne cr6,4f
- lwz 6,0(4)
- lwz 7,4(4)
- stw 6,0(3)
- stw 7,4(3)
- /* Return original dst pointer. */
- mr 3,30
- lwz 30,20(1)
- addi 1,1,32
- blr
- .align 4
-4: bf 29,2b
- lwz 6,0(4)
- stw 6,0(3)
-6:
- bf 30,5f
- lhz 7,4(4)
- sth 7,4(3)
- bf 31,0f
- lbz 8,6(4)
- stb 8,6(3)
- mr 3,30
- lwz 30,20(1)
- addi 1,1,32
- blr
- .align 4
-5:
- bf 31,0f
- lbz 6,4(4)
- stb 6,4(3)
- .align 4
-0:
- /* Return original dst pointer. */
- mr 3,30
- lwz 30,20(1)
- addi 1,1,32
- blr
-
- .align 4
-.L6:
-
- /* Copy words where the destination is aligned but the source is
- not. Use aligned word loads from the source, shifted to realign
- the data, to allow aligned destination stores.
- Use an unrolled loop to copy 4 words (16-bytes) per iteration.
- A single word is retained for storing at loop exit to avoid walking
- off the end of a page within the loop.
- If the copy is not an exact multiple of 16 bytes, 1-3
- words are copied as needed to set up the main loop. After
- the main loop exits there may be a tail of 1-3 bytes. These bytes are
- copied a halfword/byte at a time as needed to preserve alignment. */
-
-
- cmplwi cr6,11,0 /* are there tail bytes left ? */
- subf 5,10,12 /* back up src pointer to prev word alignment */
- slwi 10,10,3 /* calculate number of bits to shift 1st word left */
- addi 11,9,-1 /* we move one word after the loop */
- srwi 8,11,2 /* calculate the 16 byte loop count */
- lwz 6,0(5) /* load 1st src word into R6 */
- mr 4,3
- lwz 7,4(5) /* load 2nd src word into R7 */
- mtcrf 0x01,11
- subfic 9,10,32 /* number of bits to shift 2nd word right */
- mtctr 8
- bf 30,1f
-
- /* there are at least two words to copy, so copy them */
- slw 0,6,10 /* shift 1st src word to left align it in R0 */
- srw 8,7,9 /* shift 2nd src word to right align it in R8 */
- or 0,0,8 /* or them to get word to store */
- lwz 6,8(5) /* load the 3rd src word */
- stw 0,0(4) /* store the 1st dst word */
- slw 0,7,10 /* now left align 2nd src word into R0 */
- srw 8,6,9 /* shift 3rd src word to right align it in R8 */
- or 0,0,8 /* or them to get word to store */
- lwz 7,12(5)
- stw 0,4(4) /* store the 2nd dst word */
- addi 4,4,8
- addi 5,5,16
- bf 31,4f
- /* there is a third word to copy, so copy it */
- slw 0,6,10 /* shift 3rd src word to left align it in R0 */
- srw 8,7,9 /* shift 4th src word to right align it in R8 */
- or 0,0,8 /* or them to get word to store */
- stw 0,0(4) /* store 3rd dst word */
- mr 6,7
- lwz 7,0(5)
- addi 5,5,4
- addi 4,4,4
- b 4f
- .align 4
-1:
- slw 0,6,10 /* shift 1st src word to left align it in R0 */
- srw 8,7,9 /* shift 2nd src word to right align it in R8 */
- addi 5,5,8
- or 0,0,8 /* or them to get word to store */
- bf 31,4f
- mr 6,7
- lwz 7,0(5)
- addi 5,5,4
- stw 0,0(4) /* store the 1st dst word */
- addi 4,4,4
-
- .align 4
-4:
- /* copy 16 bytes at a time */
- slw 0,6,10
- srw 8,7,9
- or 0,0,8
- lwz 6,0(5)
- stw 0,0(4)
- slw 0,7,10
- srw 8,6,9
- or 0,0,8
- lwz 7,4(5)
- stw 0,4(4)
- slw 0,6,10
- srw 8,7,9
- or 0,0,8
- lwz 6,8(5)
- stw 0,8(4)
- slw 0,7,10
- srw 8,6,9
- or 0,0,8
- lwz 7,12(5)
- stw 0,12(4)
- addi 5,5,16
- addi 4,4,16
- bdnz+ 4b
-8:
- /* calculate and store the final word */
- slw 0,6,10
- srw 8,7,9
- or 0,0,8
- stw 0,0(4)
-3:
- clrrwi 0,31,2
- mtcrf 0x01,31
- bne cr6,.L9 /* If the tail is 0 bytes we are done! */
-
- /* Return original dst pointer. */
- mr 3,30
- lwz 30,20(1)
- lwz 31,24(1)
- addi 1,1,32
- blr
-END (BP_SYM (memcpy))
-
-libc_hidden_builtin_def (memcpy)
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 10:52:40 +0000