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1275 |
phoenix |
/* $Id: U3memcpy.S,v 1.1.1.1 2004-04-15 01:33:48 phoenix Exp $
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* U3memcpy.S: UltraSparc-III optimized memcpy.
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*
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* Copyright (C) 1999, 2000 David S. Miller (davem@redhat.com)
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*/
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#ifdef __KERNEL__
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#include
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#include
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#include
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#include
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#undef SMALL_COPY_USES_FPU
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#else
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#define ASI_BLK_P 0xf0
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#define FPRS_FEF 0x04
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#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
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#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
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#define SMALL_COPY_USES_FPU
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#endif
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/* Special/non-trivial issues of this code:
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*
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* 1) %o5 is preserved from VISEntryHalf to VISExitHalf
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* 2) Only low 32 FPU registers are used so that only the
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* lower half of the FPU register set is dirtied by this
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* code. This is especially important in the kernel.
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* 3) This code never prefetches cachelines past the end
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* of the source buffer.
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*/
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.text
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.align 32
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/* The cheetah's flexible spine, oversized liver, enlarged heart,
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* slender muscular body, and claws make it the swiftest hunter
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* in Africa and the fastest animal on land. Can reach speeds
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* of up to 2.4GB per second.
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*/
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.globl U3memcpy
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U3memcpy: /* %o0=dst, %o1=src, %o2=len */
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#ifndef __KERNEL__
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/* Save away original 'dst' for memcpy return value. */
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mov %o0, %g3 ! A0 Group
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#endif
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/* Anything to copy at all? */
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cmp %o2, 0 ! A1
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ble,pn %icc, U3memcpy_short_ret ! BR
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/* Extremely small copy? */
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cmp %o2, 31 ! A0 Group
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ble,pn %icc, U3memcpy_short ! BR
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/* Large enough to use unrolled prefetch loops? */
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cmp %o2, 0x100 ! A1
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bge,a,pt %icc, U3memcpy_enter ! BR Group
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andcc %o0, 0x3f, %g2 ! A0
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ba,pt %xcc, U3memcpy_toosmall ! BR Group
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andcc %o0, 0x7, %g2 ! A0
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.align 32
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U3memcpy_short:
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/* Copy %o2 bytes from src to dst, one byte at a time. */
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ldub [%o1 + 0x00], %o3 ! MS Group
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add %o1, 0x1, %o1 ! A0
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add %o0, 0x1, %o0 ! A1
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subcc %o2, 1, %o2 ! A0 Group
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bg,pt %icc, U3memcpy_short ! BR
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stb %o3, [%o0 + -1] ! MS Group (1-cycle stall)
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U3memcpy_short_ret:
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#ifdef __KERNEL__
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retl ! BR Group (0-4 cycle stall)
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clr %o0 ! A0
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#else
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retl ! BR Group (0-4 cycle stall)
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mov %g3, %o0 ! A0
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#endif
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/* Here len >= (6 * 64) and condition codes reflect execution
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* of "andcc %o0, 0x7, %g2", done by caller.
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*/
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.align 64
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U3memcpy_enter:
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/* Is 'dst' already aligned on an 64-byte boundary? */
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be,pt %xcc, 2f ! BR
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/* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number
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* of bytes to copy to make 'dst' 64-byte aligned. We pre-
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* subtract this from 'len'.
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*/
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sub %g2, 0x40, %g2 ! A0 Group
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sub %g0, %g2, %g2 ! A0 Group
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sub %o2, %g2, %o2 ! A0 Group
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/* Copy %g2 bytes from src to dst, one byte at a time. */
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1: ldub [%o1 + 0x00], %o3 ! MS (Group)
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add %o1, 0x1, %o1 ! A1
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add %o0, 0x1, %o0 ! A0 Group
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subcc %g2, 0x1, %g2 ! A1
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bg,pt %icc, 1b ! BR Group
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stb %o3, [%o0 + -1] ! MS Group
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2: VISEntryHalf ! MS+MS
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and %o1, 0x7, %g1 ! A1
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ba,pt %xcc, U3memcpy_begin ! BR
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alignaddr %o1, %g0, %o1 ! MS (Break-after)
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.align 64
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U3memcpy_begin:
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#ifdef __KERNEL__
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.globl U3memcpy_nop_1_6
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U3memcpy_nop_1_6:
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ldxa [%g0] ASI_DCU_CONTROL_REG, %g3
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sethi %uhi(DCU_PE), %o3
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sllx %o3, 32, %o3
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or %g3, %o3, %o3
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stxa %o3, [%g0] ASI_DCU_CONTROL_REG ! Enable P-cache
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membar #Sync
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#endif
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prefetch [%o1 + 0x000], #one_read ! MS Group1
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prefetch [%o1 + 0x040], #one_read ! MS Group2
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andn %o2, (0x40 - 1), %o4 ! A0
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prefetch [%o1 + 0x080], #one_read ! MS Group3
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cmp %o4, 0x140 ! A0
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prefetch [%o1 + 0x0c0], #one_read ! MS Group4
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ldd [%o1 + 0x000], %f0 ! MS Group5 (%f0 results at G8)
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bge,a,pt %icc, 1f ! BR
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prefetch [%o1 + 0x100], #one_read ! MS Group6
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1: ldd [%o1 + 0x008], %f2 ! AX (%f2 results at G9)
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cmp %o4, 0x180 ! A1
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bge,a,pt %icc, 1f ! BR
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prefetch [%o1 + 0x140], #one_read ! MS Group7
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1: ldd [%o1 + 0x010], %f4 ! AX (%f4 results at G10)
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cmp %o4, 0x1c0 ! A1
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bge,a,pt %icc, 1f ! BR
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prefetch [%o1 + 0x180], #one_read ! MS Group8
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1: faligndata %f0, %f2, %f16 ! FGA Group9 (%f16 at G12)
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ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G12)
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faligndata %f2, %f4, %f18 ! FGA Group10 (%f18 results at G13)
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ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G13)
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faligndata %f4, %f6, %f20 ! FGA Group12 (1-cycle stall,%f20 at G15)
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ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G15)
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faligndata %f6, %f8, %f22 ! FGA Group13 (%f22 results at G16)
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ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G16)
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faligndata %f8, %f10, %f24 ! FGA Group15 (1-cycle stall,%f24 at G18)
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ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18)
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faligndata %f10, %f12, %f26 ! FGA Group16 (%f26 results at G19)
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ldd [%o1 + 0x040], %f0 ! MS (%f0 results at G19)
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/* We only use the first loop if len > (7 * 64). */
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subcc %o4, 0x1c0, %o4 ! A0 Group17
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bg,pt %icc, U3memcpy_loop1 ! BR
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add %o1, 0x40, %o1 ! A1
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add %o4, 0x140, %o4 ! A0 Group18
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ba,pt %xcc, U3memcpy_loop2 ! BR
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srl %o4, 6, %o3 ! A0 Group19
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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/* This loop performs the copy and queues new prefetches.
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* We drop into the second loop when len <= (5 * 64). Note
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* that this (5 * 64) factor has been subtracted from len
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* already.
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*/
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U3memcpy_loop1:
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ldd [%o1 + 0x008], %f2 ! MS Group2 (%f2 results at G5)
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faligndata %f12, %f14, %f28 ! FGA (%f28 results at G5)
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ldd [%o1 + 0x010], %f4 ! MS Group3 (%f4 results at G6)
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faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall, %f30 at G7)
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stda %f16, [%o0] ASI_BLK_P ! MS
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ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G7)
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faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
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ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G15)
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faligndata %f2, %f4, %f18 ! FGA Group13 (%f18 results at G16)
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ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G16)
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faligndata %f4, %f6, %f20 ! FGA Group14 (%f20 results at G17)
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ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G17)
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faligndata %f6, %f8, %f22 ! FGA Group15 (%f22 results at G18)
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ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18)
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faligndata %f8, %f10, %f24 ! FGA Group16 (%f24 results at G19)
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ldd [%o1 + 0x040], %f0 ! AX (%f0 results at G19)
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prefetch [%o1 + 0x180], #one_read ! MS
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faligndata %f10, %f12, %f26 ! FGA Group17 (%f26 results at G20)
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subcc %o4, 0x40, %o4 ! A0
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add %o1, 0x40, %o1 ! A1
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bg,pt %xcc, U3memcpy_loop1 ! BR
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add %o0, 0x40, %o0 ! A0 Group18
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U3memcpy_loop2_enter:
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mov 5, %o3 ! A1
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/* This loop performs on the copy, no new prefetches are
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* queued. We do things this way so that we do not perform
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* any spurious prefetches past the end of the src buffer.
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*/
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U3memcpy_loop2:
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ldd [%o1 + 0x008], %f2 ! MS
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faligndata %f12, %f14, %f28 ! FGA Group2
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ldd [%o1 + 0x010], %f4 ! MS
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faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall)
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stda %f16, [%o0] ASI_BLK_P ! MS
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ldd [%o1 + 0x018], %f6 ! AX
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faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
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ldd [%o1 + 0x020], %f8 ! MS
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faligndata %f2, %f4, %f18 ! FGA Group13
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ldd [%o1 + 0x028], %f10 ! MS
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faligndata %f4, %f6, %f20 ! FGA Group14
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ldd [%o1 + 0x030], %f12 ! MS
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faligndata %f6, %f8, %f22 ! FGA Group15
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| 227 |
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ldd [%o1 + 0x038], %f14 ! MS
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faligndata %f8, %f10, %f24 ! FGA Group16
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ldd [%o1 + 0x040], %f0 ! AX
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faligndata %f10, %f12, %f26 ! FGA Group17
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| 232 |
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subcc %o3, 0x01, %o3 ! A0
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| 233 |
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add %o1, 0x40, %o1 ! A1
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| 234 |
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bg,pt %xcc, U3memcpy_loop2 ! BR
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| 235 |
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add %o0, 0x40, %o0 ! A0 Group18
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| 237 |
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/* Finally we copy the last full 64-byte block. */
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| 238 |
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U3memcpy_loopfini:
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| 239 |
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ldd [%o1 + 0x008], %f2 ! MS
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| 240 |
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faligndata %f12, %f14, %f28 ! FGA
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| 241 |
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ldd [%o1 + 0x010], %f4 ! MS Group19
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| 242 |
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faligndata %f14, %f0, %f30 ! FGA
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| 243 |
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stda %f16, [%o0] ASI_BLK_P ! MS Group20
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| 244 |
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ldd [%o1 + 0x018], %f6 ! AX
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| 245 |
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faligndata %f0, %f2, %f16 ! FGA Group11 (7-cycle stall)
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| 246 |
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ldd [%o1 + 0x020], %f8 ! MS
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| 247 |
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faligndata %f2, %f4, %f18 ! FGA Group12
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| 248 |
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ldd [%o1 + 0x028], %f10 ! MS
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| 249 |
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faligndata %f4, %f6, %f20 ! FGA Group13
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| 250 |
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ldd [%o1 + 0x030], %f12 ! MS
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| 251 |
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faligndata %f6, %f8, %f22 ! FGA Group14
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| 252 |
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ldd [%o1 + 0x038], %f14 ! MS
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| 253 |
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faligndata %f8, %f10, %f24 ! FGA Group15
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| 254 |
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cmp %g1, 0 ! A0
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| 255 |
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be,pt %icc, 1f ! BR
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| 256 |
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add %o0, 0x40, %o0 ! A1
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| 257 |
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ldd [%o1 + 0x040], %f0 ! MS
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| 258 |
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1: faligndata %f10, %f12, %f26 ! FGA Group16
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| 259 |
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faligndata %f12, %f14, %f28 ! FGA Group17
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| 260 |
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faligndata %f14, %f0, %f30 ! FGA Group18
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| 261 |
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stda %f16, [%o0] ASI_BLK_P ! MS
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| 262 |
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add %o0, 0x40, %o0 ! A0
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| 263 |
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add %o1, 0x40, %o1 ! A1
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| 264 |
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#ifdef __KERNEL__
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| 265 |
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.globl U3memcpy_nop_2_3
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| 266 |
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U3memcpy_nop_2_3:
|
| 267 |
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mov PRIMARY_CONTEXT, %o3
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| 268 |
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stxa %g0, [%o3] ASI_DMMU ! Flush P-cache
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| 269 |
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stxa %g3, [%g0] ASI_DCU_CONTROL_REG ! Disable P-cache
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| 270 |
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#endif
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| 271 |
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membar #Sync ! MS Group26 (7-cycle stall)
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| 272 |
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| 273 |
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/* Now we copy the (len modulo 64) bytes at the end.
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| 274 |
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* Note how we borrow the %f0 loaded above.
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| 275 |
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*
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| 276 |
|
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* Also notice how this code is careful not to perform a
|
| 277 |
|
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* load past the end of the src buffer just like similar
|
| 278 |
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* code found in U3memcpy_toosmall processing.
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| 279 |
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*/
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| 280 |
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U3memcpy_loopend:
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| 281 |
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and %o2, 0x3f, %o2 ! A0 Group
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| 282 |
|
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andcc %o2, 0x38, %g2 ! A0 Group
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| 283 |
|
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be,pn %icc, U3memcpy_endcruft ! BR
|
| 284 |
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subcc %g2, 0x8, %g2 ! A1
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| 285 |
|
|
be,pn %icc, U3memcpy_endcruft ! BR Group
|
| 286 |
|
|
cmp %g1, 0 ! A0
|
| 287 |
|
|
|
| 288 |
|
|
be,a,pt %icc, 1f ! BR Group
|
| 289 |
|
|
ldd [%o1 + 0x00], %f0 ! MS
|
| 290 |
|
|
|
| 291 |
|
|
1: ldd [%o1 + 0x08], %f2 ! MS Group
|
| 292 |
|
|
add %o1, 0x8, %o1 ! A0
|
| 293 |
|
|
sub %o2, 0x8, %o2 ! A1
|
| 294 |
|
|
subcc %g2, 0x8, %g2 ! A0 Group
|
| 295 |
|
|
faligndata %f0, %f2, %f8 ! FGA Group
|
| 296 |
|
|
std %f8, [%o0 + 0x00] ! MS (XXX does it stall here? XXX)
|
| 297 |
|
|
be,pn %icc, U3memcpy_endcruft ! BR
|
| 298 |
|
|
add %o0, 0x8, %o0 ! A0
|
| 299 |
|
|
ldd [%o1 + 0x08], %f0 ! MS Group
|
| 300 |
|
|
add %o1, 0x8, %o1 ! A0
|
| 301 |
|
|
sub %o2, 0x8, %o2 ! A1
|
| 302 |
|
|
subcc %g2, 0x8, %g2 ! A0 Group
|
| 303 |
|
|
faligndata %f2, %f0, %f8 ! FGA
|
| 304 |
|
|
std %f8, [%o0 + 0x00] ! MS (XXX does it stall here? XXX)
|
| 305 |
|
|
bne,pn %icc, 1b ! BR
|
| 306 |
|
|
add %o0, 0x8, %o0 ! A0 Group
|
| 307 |
|
|
|
| 308 |
|
|
/* If anything is left, we copy it one byte at a time.
|
| 309 |
|
|
* Note that %g1 is (src & 0x3) saved above before the
|
| 310 |
|
|
* alignaddr was performed.
|
| 311 |
|
|
*/
|
| 312 |
|
|
U3memcpy_endcruft:
|
| 313 |
|
|
cmp %o2, 0
|
| 314 |
|
|
add %o1, %g1, %o1
|
| 315 |
|
|
VISExitHalf
|
| 316 |
|
|
be,pn %icc, U3memcpy_short_ret
|
| 317 |
|
|
nop
|
| 318 |
|
|
ba,a,pt %xcc, U3memcpy_short
|
| 319 |
|
|
|
| 320 |
|
|
/* If we get here, then 32 <= len < (6 * 64) */
|
| 321 |
|
|
U3memcpy_toosmall:
|
| 322 |
|
|
|
| 323 |
|
|
#ifdef SMALL_COPY_USES_FPU
|
| 324 |
|
|
|
| 325 |
|
|
/* Is 'dst' already aligned on an 8-byte boundary? */
|
| 326 |
|
|
be,pt %xcc, 2f ! BR Group
|
| 327 |
|
|
|
| 328 |
|
|
/* Compute abs((dst & 7) - 8) into %g2. This is the number
|
| 329 |
|
|
* of bytes to copy to make 'dst' 8-byte aligned. We pre-
|
| 330 |
|
|
* subtract this from 'len'.
|
| 331 |
|
|
*/
|
| 332 |
|
|
sub %g2, 0x8, %g2 ! A0
|
| 333 |
|
|
sub %g0, %g2, %g2 ! A0 Group (reg-dep)
|
| 334 |
|
|
sub %o2, %g2, %o2 ! A0 Group (reg-dep)
|
| 335 |
|
|
|
| 336 |
|
|
/* Copy %g2 bytes from src to dst, one byte at a time. */
|
| 337 |
|
|
1: ldub [%o1 + 0x00], %o3 ! MS (Group) (%o3 in 3 cycles)
|
| 338 |
|
|
add %o1, 0x1, %o1 ! A1
|
| 339 |
|
|
add %o0, 0x1, %o0 ! A0 Group
|
| 340 |
|
|
subcc %g2, 0x1, %g2 ! A1
|
| 341 |
|
|
|
| 342 |
|
|
bg,pt %icc, 1b ! BR Group
|
| 343 |
|
|
stb %o3, [%o0 + -1] ! MS Group
|
| 344 |
|
|
|
| 345 |
|
|
2: VISEntryHalf ! MS+MS
|
| 346 |
|
|
|
| 347 |
|
|
/* Compute (len - (len % 8)) into %g2. This is guarenteed
|
| 348 |
|
|
* to be nonzero.
|
| 349 |
|
|
*/
|
| 350 |
|
|
andn %o2, 0x7, %g2 ! A0 Group
|
| 351 |
|
|
|
| 352 |
|
|
/* You may read this and believe that it allows reading
|
| 353 |
|
|
* one 8-byte longword past the end of src. It actually
|
| 354 |
|
|
* does not, as %g2 is subtracted as loads are done from
|
| 355 |
|
|
* src, so we always stop before running off the end.
|
| 356 |
|
|
* Also, we are guarenteed to have at least 0x10 bytes
|
| 357 |
|
|
* to move here.
|
| 358 |
|
|
*/
|
| 359 |
|
|
sub %g2, 0x8, %g2 ! A0 Group (reg-dep)
|
| 360 |
|
|
alignaddr %o1, %g0, %g1 ! MS (Break-after)
|
| 361 |
|
|
ldd [%g1 + 0x00], %f0 ! MS Group (1-cycle stall)
|
| 362 |
|
|
add %g1, 0x8, %g1 ! A0
|
| 363 |
|
|
|
| 364 |
|
|
1: ldd [%g1 + 0x00], %f2 ! MS Group
|
| 365 |
|
|
add %g1, 0x8, %g1 ! A0
|
| 366 |
|
|
sub %o2, 0x8, %o2 ! A1
|
| 367 |
|
|
subcc %g2, 0x8, %g2 ! A0 Group
|
| 368 |
|
|
|
| 369 |
|
|
faligndata %f0, %f2, %f8 ! FGA Group (1-cycle stall)
|
| 370 |
|
|
std %f8, [%o0 + 0x00] ! MS Group (2-cycle stall)
|
| 371 |
|
|
add %o1, 0x8, %o1 ! A0
|
| 372 |
|
|
be,pn %icc, 2f ! BR
|
| 373 |
|
|
|
| 374 |
|
|
add %o0, 0x8, %o0 ! A1
|
| 375 |
|
|
ldd [%g1 + 0x00], %f0 ! MS Group
|
| 376 |
|
|
add %g1, 0x8, %g1 ! A0
|
| 377 |
|
|
sub %o2, 0x8, %o2 ! A1
|
| 378 |
|
|
|
| 379 |
|
|
subcc %g2, 0x8, %g2 ! A0 Group
|
| 380 |
|
|
faligndata %f2, %f0, %f8 ! FGA Group (1-cycle stall)
|
| 381 |
|
|
std %f8, [%o0 + 0x00] ! MS Group (2-cycle stall)
|
| 382 |
|
|
add %o1, 0x8, %o1 ! A0
|
| 383 |
|
|
|
| 384 |
|
|
bne,pn %icc, 1b ! BR
|
| 385 |
|
|
add %o0, 0x8, %o0 ! A1
|
| 386 |
|
|
|
| 387 |
|
|
/* Nothing left to copy? */
|
| 388 |
|
|
2: cmp %o2, 0 ! A0 Group
|
| 389 |
|
|
VISExitHalf ! A0+MS
|
| 390 |
|
|
be,pn %icc, U3memcpy_short_ret ! BR Group
|
| 391 |
|
|
nop ! A0
|
| 392 |
|
|
ba,a,pt %xcc, U3memcpy_short ! BR Group
|
| 393 |
|
|
|
| 394 |
|
|
#else /* !(SMALL_COPY_USES_FPU) */
|
| 395 |
|
|
|
| 396 |
|
|
xor %o1, %o0, %g2
|
| 397 |
|
|
andcc %g2, 0x7, %g0
|
| 398 |
|
|
bne,pn %icc, U3memcpy_short
|
| 399 |
|
|
andcc %o1, 0x7, %g2
|
| 400 |
|
|
|
| 401 |
|
|
be,pt %xcc, 2f
|
| 402 |
|
|
sub %g2, 0x8, %g2
|
| 403 |
|
|
sub %g0, %g2, %g2
|
| 404 |
|
|
sub %o2, %g2, %o2
|
| 405 |
|
|
|
| 406 |
|
|
1: ldub [%o1 + 0x00], %o3
|
| 407 |
|
|
add %o1, 0x1, %o1
|
| 408 |
|
|
add %o0, 0x1, %o0
|
| 409 |
|
|
subcc %g2, 0x1, %g2
|
| 410 |
|
|
bg,pt %icc, 1b
|
| 411 |
|
|
stb %o3, [%o0 + -1]
|
| 412 |
|
|
|
| 413 |
|
|
2: andn %o2, 0x7, %g2
|
| 414 |
|
|
sub %o2, %g2, %o2
|
| 415 |
|
|
|
| 416 |
|
|
3: ldx [%o1 + 0x00], %o3
|
| 417 |
|
|
add %o1, 0x8, %o1
|
| 418 |
|
|
add %o0, 0x8, %o0
|
| 419 |
|
|
subcc %g2, 0x8, %g2
|
| 420 |
|
|
bg,pt %icc, 3b
|
| 421 |
|
|
stx %o3, [%o0 + -8]
|
| 422 |
|
|
|
| 423 |
|
|
cmp %o2, 0
|
| 424 |
|
|
bne,pn %icc, U3memcpy_short
|
| 425 |
|
|
nop
|
| 426 |
|
|
ba,a,pt %xcc, U3memcpy_short_ret
|
| 427 |
|
|
|
| 428 |
|
|
#endif /* !(SMALL_COPY_USES_FPU) */
|
