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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/lib/memcpy-sh4.S
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sh/lib/memcpy-sh4.S')
-rw-r--r--arch/sh/lib/memcpy-sh4.S800
1 files changed, 800 insertions, 0 deletions
diff --git a/arch/sh/lib/memcpy-sh4.S b/arch/sh/lib/memcpy-sh4.S
new file mode 100644
index 00000000000..55f227441f9
--- /dev/null
+++ b/arch/sh/lib/memcpy-sh4.S
@@ -0,0 +1,800 @@
+/*
+ * "memcpy" implementation of SuperH
+ *
+ * Copyright (C) 1999 Niibe Yutaka
+ * Copyright (c) 2002 STMicroelectronics Ltd
+ * Modified from memcpy.S and micro-optimised for SH4
+ * Stuart Menefy (stuart.menefy@st.com)
+ *
+ */
+#include <linux/linkage.h>
+#include <linux/config.h>
+
+/*
+ * void *memcpy(void *dst, const void *src, size_t n);
+ *
+ * It is assumed that there is no overlap between src and dst.
+ * If there is an overlap, then the results are undefined.
+ */
+
+ !
+ ! GHIJ KLMN OPQR --> ...G HIJK LMNO PQR.
+ !
+
+ ! Size is 16 or greater, and may have trailing bytes
+
+ .balign 32
+.Lcase1:
+ ! Read a long word and write a long word at once
+ ! At the start of each iteration, r7 contains last long load
+ add #-1,r5 ! 79 EX
+ mov r4,r2 ! 5 MT (0 cycles latency)
+
+ mov.l @(r0,r5),r7 ! 21 LS (2 cycles latency)
+ add #-4,r5 ! 50 EX
+
+ add #7,r2 ! 79 EX
+ !
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+ ! 6 cycles, 4 bytes per iteration
+3: mov.l @(r0,r5),r1 ! 21 LS (latency=2) ! NMLK
+ mov r7, r3 ! 5 MT (latency=0) ! RQPO
+
+ cmp/hi r2,r0 ! 57 MT
+ shll16 r3 ! 103 EX
+
+ mov r1,r6 ! 5 MT (latency=0)
+ shll8 r3 ! 102 EX ! Oxxx
+
+ shlr8 r6 ! 106 EX ! xNML
+ mov r1, r7 ! 5 MT (latency=0)
+
+ or r6,r3 ! 82 EX ! ONML
+ bt/s 3b ! 109 BR
+
+ mov.l r3,@-r0 ! 30 LS
+#else
+3: mov.l @(r0,r5),r1 ! 21 LS (latency=2) ! KLMN
+ mov r7,r3 ! 5 MT (latency=0) ! OPQR
+
+ cmp/hi r2,r0 ! 57 MT
+ shlr16 r3 ! 107 EX
+
+ shlr8 r3 ! 106 EX ! xxxO
+ mov r1,r6 ! 5 MT (latency=0)
+
+ shll8 r6 ! 102 EX ! LMNx
+ mov r1,r7 ! 5 MT (latency=0)
+
+ or r6,r3 ! 82 EX ! LMNO
+ bt/s 3b ! 109 BR
+
+ mov.l r3,@-r0 ! 30 LS
+#endif
+ ! Finally, copy a byte at once, if necessary
+
+ add #4,r5 ! 50 EX
+ cmp/eq r4,r0 ! 54 MT
+
+ add #-6,r2 ! 50 EX
+ bt 9f ! 109 BR
+
+8: cmp/hi r2,r0 ! 57 MT
+ mov.b @(r0,r5),r1 ! 20 LS (latency=2)
+
+ bt/s 8b ! 109 BR
+
+ mov.b r1,@-r0 ! 29 LS
+
+9: rts
+ nop
+
+
+ !
+ ! GHIJ KLMN OPQR --> .GHI JKLM NOPQ R...
+ !
+
+ ! Size is 16 or greater, and may have trailing bytes
+
+ .balign 32
+.Lcase3:
+ ! Read a long word and write a long word at once
+ ! At the start of each iteration, r7 contains last long load
+ add #-3,r5 ! 79 EX
+ mov r4,r2 ! 5 MT (0 cycles latency)
+
+ mov.l @(r0,r5),r7 ! 21 LS (2 cycles latency)
+ add #-4,r5 ! 50 EX
+
+ add #7,r2 ! 79 EX
+ !
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+ ! 6 cycles, 4 bytes per iteration
+3: mov.l @(r0,r5),r1 ! 21 LS (latency=2) ! NMLK
+ mov r7, r3 ! 5 MT (latency=0) ! RQPO
+
+ cmp/hi r2,r0 ! 57 MT
+ shll8 r3 ! 102 EX ! QPOx
+
+ mov r1,r6 ! 5 MT (latency=0)
+ shlr16 r6 ! 107 EX
+
+ shlr8 r6 ! 106 EX ! xxxN
+ mov r1, r7 ! 5 MT (latency=0)
+
+ or r6,r3 ! 82 EX ! QPON
+ bt/s 3b ! 109 BR
+
+ mov.l r3,@-r0 ! 30 LS
+#else
+3: mov r1,r3 ! OPQR
+ shlr8 r3 ! xOPQ
+ mov.l @(r0,r5),r1 ! KLMN
+ mov r1,r6
+ shll16 r6
+ shll8 r6 ! Nxxx
+ or r6,r3 ! NOPQ
+ cmp/hi r2,r0
+ bt/s 3b
+ mov.l r3,@-r0
+#endif
+
+ ! Finally, copy a byte at once, if necessary
+
+ add #6,r5 ! 50 EX
+ cmp/eq r4,r0 ! 54 MT
+
+ add #-6,r2 ! 50 EX
+ bt 9f ! 109 BR
+
+8: cmp/hi r2,r0 ! 57 MT
+ mov.b @(r0,r5),r1 ! 20 LS (latency=2)
+
+ bt/s 8b ! 109 BR
+
+ mov.b r1,@-r0 ! 29 LS
+
+9: rts
+ nop
+
+ENTRY(memcpy)
+
+ ! Calculate the invariants which will be used in the remainder
+ ! of the code:
+ !
+ ! r4 --> [ ... ] DST [ ... ] SRC
+ ! [ ... ] [ ... ]
+ ! : :
+ ! r0 --> [ ... ] r0+r5 --> [ ... ]
+ !
+ !
+
+ ! Short circuit the common case of src, dst and len being 32 bit aligned
+ ! and test for zero length move
+
+ mov r6, r0 ! 5 MT (0 cycle latency)
+ or r4, r0 ! 82 EX
+
+ or r5, r0 ! 82 EX
+ tst r6, r6 ! 86 MT
+
+ bt/s 99f ! 111 BR (zero len)
+ tst #3, r0 ! 87 MT
+
+ mov r4, r0 ! 5 MT (0 cycle latency)
+ add r6, r0 ! 49 EX
+
+ mov #16, r1 ! 6 EX
+ bt/s .Lcase00 ! 111 BR (aligned)
+
+ sub r4, r5 ! 75 EX
+
+ ! Arguments are not nicely long word aligned or zero len.
+ ! Check for small copies, and if so do a simple byte at a time copy.
+ !
+ ! Deciding on an exact value of 'small' is not easy, as the point at which
+ ! using the optimised routines become worthwhile varies (these are the
+ ! cycle counts for differnet sizes using byte-at-a-time vs. optimised):
+ ! size byte-at-time long word byte
+ ! 16 42 39-40 46-50 50-55
+ ! 24 58 43-44 54-58 62-67
+ ! 36 82 49-50 66-70 80-85
+ ! However the penalty for getting it 'wrong' is much higher for long word
+ ! aligned data (and this is more common), so use a value of 16.
+
+ cmp/gt r6,r1 ! 56 MT
+
+ add #-1,r5 ! 50 EX
+ bf/s 6f ! 108 BR (not small)
+
+ mov r5, r3 ! 5 MT (latency=0)
+ shlr r6 ! 104 EX
+
+ mov.b @(r0,r5),r1 ! 20 LS (latency=2)
+ bf/s 4f ! 111 BR
+
+ add #-1,r3 ! 50 EX
+ tst r6, r6 ! 86 MT
+
+ bt/s 98f ! 110 BR
+ mov.b r1,@-r0 ! 29 LS
+
+ ! 4 cycles, 2 bytes per iteration
+3: mov.b @(r0,r5),r1 ! 20 LS (latency=2)
+
+4: mov.b @(r0,r3),r2 ! 20 LS (latency=2)
+ dt r6 ! 67 EX
+
+ mov.b r1,@-r0 ! 29 LS
+ bf/s 3b ! 111 BR
+
+ mov.b r2,@-r0 ! 29 LS
+98:
+ rts
+ nop
+
+99: rts
+ mov r4, r0
+
+ ! Size is not small, so its worthwhile looking for optimisations.
+ ! First align destination to a long word boundary.
+ !
+ ! r5 = normal value -1
+
+6: tst #3, r0 ! 87 MT
+ mov #3, r3 ! 6 EX
+
+ bt/s 2f ! 111 BR
+ and r0,r3 ! 78 EX
+
+ ! 3 cycles, 1 byte per iteration
+1: dt r3 ! 67 EX
+ mov.b @(r0,r5),r1 ! 19 LS (latency=2)
+
+ add #-1, r6 ! 79 EX
+ bf/s 1b ! 109 BR
+
+ mov.b r1,@-r0 ! 28 LS
+
+2: add #1, r5 ! 79 EX
+
+ ! Now select the appropriate bulk transfer code based on relative
+ ! alignment of src and dst.
+
+ mov r0, r3 ! 5 MT (latency=0)
+
+ mov r5, r0 ! 5 MT (latency=0)
+ tst #1, r0 ! 87 MT
+
+ bf/s 1f ! 111 BR
+ mov #64, r7 ! 6 EX
+
+ ! bit 0 clear
+
+ cmp/ge r7, r6 ! 55 MT
+
+ bt/s 2f ! 111 BR
+ tst #2, r0 ! 87 MT
+
+ ! small
+ bt/s .Lcase0
+ mov r3, r0
+
+ bra .Lcase2
+ nop
+
+ ! big
+2: bt/s .Lcase0b
+ mov r3, r0
+
+ bra .Lcase2b
+ nop
+
+ ! bit 0 set
+1: tst #2, r0 ! 87 MT
+
+ bt/s .Lcase1
+ mov r3, r0
+
+ bra .Lcase3
+ nop
+
+
+ !
+ ! GHIJ KLMN OPQR --> GHIJ KLMN OPQR
+ !
+
+ ! src, dst and size are all long word aligned
+ ! size is non-zero
+
+ .balign 32
+.Lcase00:
+ mov #64, r1 ! 6 EX
+ mov r5, r3 ! 5 MT (latency=0)
+
+ cmp/gt r6, r1 ! 56 MT
+ add #-4, r5 ! 50 EX
+
+ bf .Lcase00b ! 108 BR (big loop)
+ shlr2 r6 ! 105 EX
+
+ shlr r6 ! 104 EX
+ mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+
+ bf/s 4f ! 111 BR
+ add #-8, r3 ! 50 EX
+
+ tst r6, r6 ! 86 MT
+ bt/s 5f ! 110 BR
+
+ mov.l r1,@-r0 ! 30 LS
+
+ ! 4 cycles, 2 long words per iteration
+3: mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+
+4: mov.l @(r0, r3), r2 ! 21 LS (latency=2)
+ dt r6 ! 67 EX
+
+ mov.l r1, @-r0 ! 30 LS
+ bf/s 3b ! 109 BR
+
+ mov.l r2, @-r0 ! 30 LS
+
+5: rts
+ nop
+
+
+ ! Size is 16 or greater and less than 64, but may have trailing bytes
+
+ .balign 32
+.Lcase0:
+ add #-4, r5 ! 50 EX
+ mov r4, r7 ! 5 MT (latency=0)
+
+ mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+ mov #4, r2 ! 6 EX
+
+ add #11, r7 ! 50 EX
+ tst r2, r6 ! 86 MT
+
+ mov r5, r3 ! 5 MT (latency=0)
+ bt/s 4f ! 111 BR
+
+ add #-4, r3 ! 50 EX
+ mov.l r1,@-r0 ! 30 LS
+
+ ! 4 cycles, 2 long words per iteration
+3: mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+
+4: mov.l @(r0, r3), r2 ! 21 LS (latency=2)
+ cmp/hi r7, r0
+
+ mov.l r1, @-r0 ! 30 LS
+ bt/s 3b ! 109 BR
+
+ mov.l r2, @-r0 ! 30 LS
+
+ ! Copy the final 0-3 bytes
+
+ add #3,r5 ! 50 EX
+
+ cmp/eq r0, r4 ! 54 MT
+ add #-10, r7 ! 50 EX
+
+ bt 9f ! 110 BR
+
+ ! 3 cycles, 1 byte per iteration
+1: mov.b @(r0,r5),r1 ! 19 LS
+ cmp/hi r7,r0 ! 57 MT
+
+ bt/s 1b ! 111 BR
+ mov.b r1,@-r0 ! 28 LS
+
+9: rts
+ nop
+
+ ! Size is at least 64 bytes, so will be going round the big loop at least once.
+ !
+ ! r2 = rounded up r4
+ ! r3 = rounded down r0
+
+ .balign 32
+.Lcase0b:
+ add #-4, r5 ! 50 EX
+
+.Lcase00b:
+ mov r0, r3 ! 5 MT (latency=0)
+ mov #(~0x1f), r1 ! 6 EX
+
+ and r1, r3 ! 78 EX
+ mov r4, r2 ! 5 MT (latency=0)
+
+ cmp/eq r3, r0 ! 54 MT
+ add #0x1f, r2 ! 50 EX
+
+ bt/s 1f ! 110 BR
+ and r1, r2 ! 78 EX
+
+ ! copy initial words until cache line aligned
+
+ mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+ tst #4, r0 ! 87 MT
+
+ mov r5, r6 ! 5 MT (latency=0)
+ add #-4, r6 ! 50 EX
+
+ bt/s 4f ! 111 BR
+ add #8, r3 ! 50 EX
+
+ tst #0x18, r0 ! 87 MT
+
+ bt/s 1f ! 109 BR
+ mov.l r1,@-r0 ! 30 LS
+
+ ! 4 cycles, 2 long words per iteration
+3: mov.l @(r0, r5), r1 ! 21 LS (latency=2)
+
+4: mov.l @(r0, r6), r7 ! 21 LS (latency=2)
+ cmp/eq r3, r0 ! 54 MT
+
+ mov.l r1, @-r0 ! 30 LS
+ bf/s 3b ! 109 BR
+
+ mov.l r7, @-r0 ! 30 LS
+
+ ! Copy the cache line aligned blocks
+ !
+ ! In use: r0, r2, r4, r5
+ ! Scratch: r1, r3, r6, r7
+ !
+ ! We could do this with the four scratch registers, but if src
+ ! and dest hit the same cache line, this will thrash, so make
+ ! use of additional registers.
+ !
+ ! We also need r0 as a temporary (for movca), so 'undo' the invariant:
+ ! r5: src (was r0+r5)
+ ! r1: dest (was r0)
+ ! this can be reversed at the end, so we don't need to save any extra
+ ! state.
+ !
+1: mov.l r8, @-r15 ! 30 LS
+ add r0, r5 ! 49 EX
+
+ mov.l r9, @-r15 ! 30 LS
+ mov r0, r1 ! 5 MT (latency=0)
+
+ mov.l r10, @-r15 ! 30 LS
+ add #-0x1c, r5 ! 50 EX
+
+ mov.l r11, @-r15 ! 30 LS
+
+ ! 16 cycles, 32 bytes per iteration
+2: mov.l @(0x00,r5),r0 ! 18 LS (latency=2)
+ add #-0x20, r1 ! 50 EX
+ mov.l @(0x04,r5),r3 ! 18 LS (latency=2)
+ mov.l @(0x08,r5),r6 ! 18 LS (latency=2)
+ mov.l @(0x0c,r5),r7 ! 18 LS (latency=2)
+ mov.l @(0x10,r5),r8 ! 18 LS (latency=2)
+ mov.l @(0x14,r5),r9 ! 18 LS (latency=2)
+ mov.l @(0x18,r5),r10 ! 18 LS (latency=2)
+ mov.l @(0x1c,r5),r11 ! 18 LS (latency=2)
+ movca.l r0,@r1 ! 40 LS (latency=3-7)
+ mov.l r3,@(0x04,r1) ! 33 LS
+ mov.l r6,@(0x08,r1) ! 33 LS
+ mov.l r7,@(0x0c,r1) ! 33 LS
+
+ mov.l r8,@(0x10,r1) ! 33 LS
+ add #-0x20, r5 ! 50 EX
+
+ mov.l r9,@(0x14,r1) ! 33 LS
+ cmp/eq r2,r1 ! 54 MT
+
+ mov.l r10,@(0x18,r1) ! 33 LS
+ bf/s 2b ! 109 BR
+
+ mov.l r11,@(0x1c,r1) ! 33 LS
+
+ mov r1, r0 ! 5 MT (latency=0)
+
+ mov.l @r15+, r11 ! 15 LS
+ sub r1, r5 ! 75 EX
+
+ mov.l @r15+, r10 ! 15 LS
+ cmp/eq r4, r0 ! 54 MT
+
+ bf/s 1f ! 109 BR
+ mov.l @r15+, r9 ! 15 LS
+
+ rts
+1: mov.l @r15+, r8 ! 15 LS
+ sub r4, r1 ! 75 EX (len remaining)
+
+ ! number of trailing bytes is non-zero
+ !
+ ! invariants restored (r5 already decremented by 4)
+ ! also r1=num bytes remaining
+
+ mov #4, r2 ! 6 EX
+ mov r4, r7 ! 5 MT (latency=0)
+
+ add #0x1c, r5 ! 50 EX (back to -4)
+ cmp/hs r2, r1 ! 58 MT
+
+ bf/s 5f ! 108 BR
+ add #11, r7 ! 50 EX
+
+ mov.l @(r0, r5), r6 ! 21 LS (latency=2)
+ tst r2, r1 ! 86 MT
+
+ mov r5, r3 ! 5 MT (latency=0)
+ bt/s 4f ! 111 BR
+
+ add #-4, r3 ! 50 EX
+ cmp/hs r2, r1 ! 58 MT
+
+ bt/s 5f ! 111 BR
+ mov.l r6,@-r0 ! 30 LS
+
+ ! 4 cycles, 2 long words per iteration
+3: mov.l @(r0, r5), r6 ! 21 LS (latency=2)
+
+4: mov.l @(r0, r3), r2 ! 21 LS (latency=2)
+ cmp/hi r7, r0
+
+ mov.l r6, @-r0 ! 30 LS
+ bt/s 3b ! 109 BR
+
+ mov.l r2, @-r0 ! 30 LS
+
+ ! Copy the final 0-3 bytes
+
+5: cmp/eq r0, r4 ! 54 MT
+ add #-10, r7 ! 50 EX
+
+ bt 9f ! 110 BR
+ add #3,r5 ! 50 EX
+
+ ! 3 cycles, 1 byte per iteration
+1: mov.b @(r0,r5),r1 ! 19 LS
+ cmp/hi r7,r0 ! 57 MT
+
+ bt/s 1b ! 111 BR
+ mov.b r1,@-r0 ! 28 LS
+
+9: rts
+ nop
+
+ !
+ ! GHIJ KLMN OPQR --> ..GH IJKL MNOP QR..
+ !
+
+ .balign 32
+.Lcase2:
+ ! Size is 16 or greater and less then 64, but may have trailing bytes
+
+2: mov r5, r6 ! 5 MT (latency=0)
+ add #-2,r5 ! 50 EX
+
+ mov r4,r2 ! 5 MT (latency=0)
+ add #-4,r6 ! 50 EX
+
+ add #7,r2 ! 50 EX
+3: mov.w @(r0,r5),r1 ! 20 LS (latency=2)
+
+ mov.w @(r0,r6),r3 ! 20 LS (latency=2)
+ cmp/hi r2,r0 ! 57 MT
+
+ mov.w r1,@-r0 ! 29 LS
+ bt/s 3b ! 111 BR
+
+ mov.w r3,@-r0 ! 29 LS
+
+ bra 10f
+ nop
+
+
+ .balign 32
+.Lcase2b:
+ ! Size is at least 64 bytes, so will be going round the big loop at least once.
+ !
+ ! r2 = rounded up r4
+ ! r3 = rounded down r0
+
+ mov r0, r3 ! 5 MT (latency=0)
+ mov #(~0x1f), r1 ! 6 EX
+
+ and r1, r3 ! 78 EX
+ mov r4, r2 ! 5 MT (latency=0)
+
+ cmp/eq r3, r0 ! 54 MT
+ add #0x1f, r2 ! 50 EX
+
+ add #-2, r5 ! 50 EX
+ bt/s 1f ! 110 BR
+ and r1, r2 ! 78 EX
+
+ ! Copy a short word one at a time until we are cache line aligned
+ ! Normal values: r0, r2, r3, r4
+ ! Unused: r1, r6, r7
+ ! Mod: r5 (=r5-2)
+ !
+ add #2, r3 ! 50 EX
+
+2: mov.w @(r0,r5),r1 ! 20 LS (latency=2)
+ cmp/eq r3,r0 ! 54 MT
+
+ bf/s 2b ! 111 BR
+
+ mov.w r1,@-r0 ! 29 LS
+
+ ! Copy the cache line aligned blocks
+ !
+ ! In use: r0, r2, r4, r5 (=r5-2)
+ ! Scratch: r1, r3, r6, r7
+ !
+ ! We could do this with the four scratch registers, but if src
+ ! and dest hit the same cache line, this will thrash, so make
+ ! use of additional registers.
+ !
+ ! We also need r0 as a temporary (for movca), so 'undo' the invariant:
+ ! r5: src (was r0+r5)
+ ! r1: dest (was r0)
+ ! this can be reversed at the end, so we don't need to save any extra
+ ! state.
+ !
+1: mov.l r8, @-r15 ! 30 LS
+ add r0, r5 ! 49 EX
+
+ mov.l r9, @-r15 ! 30 LS
+ mov r0, r1 ! 5 MT (latency=0)
+
+ mov.l r10, @-r15 ! 30 LS
+ add #-0x1e, r5 ! 50 EX
+
+ mov.l r11, @-r15 ! 30 LS
+
+ mov.l r12, @-r15 ! 30 LS
+
+ ! 17 cycles, 32 bytes per iteration
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+2: mov.w @r5+, r0 ! 14 LS (latency=2) ..JI
+ add #-0x20, r1 ! 50 EX
+
+ mov.l @r5+, r3 ! 15 LS (latency=2) NMLK
+
+ mov.l @r5+, r6 ! 15 LS (latency=2) RQPO
+ shll16 r0 ! 103 EX JI..
+
+ mov.l @r5+, r7 ! 15 LS (latency=2)
+ xtrct r3, r0 ! 48 EX LKJI
+
+ mov.l @r5+, r8 ! 15 LS (latency=2)
+ xtrct r6, r3 ! 48 EX PONM
+
+ mov.l @r5+, r9 ! 15 LS (latency=2)
+ xtrct r7, r6 ! 48 EX
+
+ mov.l @r5+, r10 ! 15 LS (latency=2)
+ xtrct r8, r7 ! 48 EX
+
+ mov.l @r5+, r11 ! 15 LS (latency=2)
+ xtrct r9, r8 ! 48 EX
+
+ mov.w @r5+, r12 ! 15 LS (latency=2)
+ xtrct r10, r9 ! 48 EX
+
+ movca.l r0,@r1 ! 40 LS (latency=3-7)
+ xtrct r11, r10 ! 48 EX
+
+ mov.l r3, @(0x04,r1) ! 33 LS
+ xtrct r12, r11 ! 48 EX
+
+ mov.l r6, @(0x08,r1) ! 33 LS
+
+ mov.l r7, @(0x0c,r1) ! 33 LS
+
+ mov.l r8, @(0x10,r1) ! 33 LS
+ add #-0x40, r5 ! 50 EX
+
+ mov.l r9, @(0x14,r1) ! 33 LS
+ cmp/eq r2,r1 ! 54 MT
+
+ mov.l r10, @(0x18,r1) ! 33 LS
+ bf/s 2b ! 109 BR
+
+ mov.l r11, @(0x1c,r1) ! 33 LS
+#else
+2: mov.w @(0x1e,r5), r0 ! 17 LS (latency=2)
+ add #-2, r5 ! 50 EX
+
+ mov.l @(0x1c,r5), r3 ! 18 LS (latency=2)
+ add #-4, r1 ! 50 EX
+
+ mov.l @(0x18,r5), r6 ! 18 LS (latency=2)
+ shll16 r0 ! 103 EX
+
+ mov.l @(0x14,r5), r7 ! 18 LS (latency=2)
+ xtrct r3, r0 ! 48 EX
+
+ mov.l @(0x10,r5), r8 ! 18 LS (latency=2)
+ xtrct r6, r3 ! 48 EX
+
+ mov.l @(0x0c,r5), r9 ! 18 LS (latency=2)
+ xtrct r7, r6 ! 48 EX
+
+ mov.l @(0x08,r5), r10 ! 18 LS (latency=2)
+ xtrct r8, r7 ! 48 EX
+
+ mov.l @(0x04,r5), r11 ! 18 LS (latency=2)
+ xtrct r9, r8 ! 48 EX
+
+ mov.w @(0x02,r5), r12 ! 18 LS (latency=2)
+ xtrct r10, r9 ! 48 EX
+
+ movca.l r0,@r1 ! 40 LS (latency=3-7)
+ add #-0x1c, r1 ! 50 EX
+
+ mov.l r3, @(0x1c,r1) ! 33 LS
+ xtrct r11, r10 ! 48 EX
+
+ mov.l r6, @(0x18,r1) ! 33 LS
+ xtrct r12, r11 ! 48 EX
+
+ mov.l r7, @(0x14,r1) ! 33 LS
+
+ mov.l r8, @(0x10,r1) ! 33 LS
+ add #-0x3e, r5 ! 50 EX
+
+ mov.l r9, @(0x0c,r1) ! 33 LS
+ cmp/eq r2,r1 ! 54 MT
+
+ mov.l r10, @(0x08,r1) ! 33 LS
+ bf/s 2b ! 109 BR
+
+ mov.l r11, @(0x04,r1) ! 33 LS
+#endif
+
+ mov.l @r15+, r12
+ mov r1, r0 ! 5 MT (latency=0)
+
+ mov.l @r15+, r11 ! 15 LS
+ sub r1, r5 ! 75 EX
+
+ mov.l @r15+, r10 ! 15 LS
+ cmp/eq r4, r0 ! 54 MT
+
+ bf/s 1f ! 109 BR
+ mov.l @r15+, r9 ! 15 LS
+
+ rts
+1: mov.l @r15+, r8 ! 15 LS
+
+ add #0x1e, r5 ! 50 EX
+
+ ! Finish off a short word at a time
+ ! r5 must be invariant - 2
+10: mov r4,r2 ! 5 MT (latency=0)
+ add #1,r2 ! 50 EX
+
+ cmp/hi r2, r0 ! 57 MT
+ bf/s 1f ! 109 BR
+
+ add #2, r2 ! 50 EX
+
+3: mov.w @(r0,r5),r1 ! 20 LS
+ cmp/hi r2,r0 ! 57 MT
+
+ bt/s 3b ! 109 BR
+
+ mov.w r1,@-r0 ! 29 LS
+1:
+
+ !
+ ! Finally, copy the last byte if necessary
+ cmp/eq r4,r0 ! 54 MT
+ bt/s 9b
+ add #1,r5
+ mov.b @(r0,r5),r1
+ rts
+ mov.b r1,@-r0
+