/*************************************************************************** Copyright (c) 2009-2011 Code Aurora Forum. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Code Aurora nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***************************************************************************/ /*************************************************************************** * Neon memmove: Attempts to do a memmove with Neon registers if possible, * Inputs: * dest: The destination buffer * src: The source buffer * n: The size of the buffer to transfer * Outputs: * ***************************************************************************/ #include #if defined(SCORPION_NEON_OPTIMIZATION) /* * These can be overridden in: * device///BoardConfig.mk * by setting the following: * TARGET_USE_SCORPION_BIONIC_OPTIMIZATION := true * TARGET_USE_SCORPION_PLD_SET := true * TARGET_SCORPION_BIONIC_PLDOFFS := * TARGET_SCORPION_BIONIC_PLDSIZE := */ #ifndef PLDOFFS #define PLDOFFS (6) #endif #ifndef PLDSIZE #define PLDSIZE (128) /* L2 cache line size */ #endif .code 32 .align 5 .global memmove .type memmove, %function .global bcopy .type bcopy, %function bcopy: mov r12, r0 mov r0, r1 mov r1, r12 memmove: push {r0} /* * The requirements for memmove state that the function should * operate as if data were being copied from the source to a * buffer, then to the destination. This is to allow a user * to copy data from a source and target that overlap. * * We can't just do byte copies front-to-back automatically, since * there's a good chance we may have an overlap (why else would someone * intentionally use memmove then?). * * We'll break this into two parts. Front-to-back, or back-to-front * copies. */ .Lneon_memmove_cmf: cmp r0, r1 blt .Lneon_front_to_back_copy bgt .Lneon_back_to_front_copy b .Lneon_memmove_done /* ############################################################# * Front to Back copy */ .Lneon_front_to_back_copy: /* * For small copies, just do a quick memcpy. We can do this for * front-to-back copies, aligned or unaligned, since we're only * doing 1 byte at a time... */ cmp r2, #4 bgt .Lneon_f2b_gt4 cmp r2, #0 .Lneon_f2b_smallcopy_loop: beq .Lneon_memmove_done ldrb r12, [r1], #1 subs r2, r2, #1 strb r12, [r0], #1 b .Lneon_f2b_smallcopy_loop .Lneon_f2b_gt4: /* The window size is in r3. */ sub r3, r1, r0 /* ############################################################# * Front to Back copy */ /* * Note that we can't just route based on the size in r2. If that's * larger than the overlap window in r3, we could potentially * (and likely!) destroy data we're copying. */ cmp r2, r3 movle r12, r2 movgt r12, r3 cmp r12, #256 bge .Lneon_f2b_copy_128 cmp r12, #64 bge .Lneon_f2b_copy_32 cmp r12, #16 bge .Lneon_f2b_copy_16 cmp r12, #8 bge .Lneon_f2b_copy_8 cmp r12, #4 bge .Lneon_f2b_copy_4 b .Lneon_f2b_copy_1 nop .Lneon_f2b_copy_128: mov r12, r2, lsr #7 cmp r12, #PLDOFFS ble .Lneon_f2b_copy_128_loop_nopld sub r12, #PLDOFFS pld [r1, #(PLDOFFS-1)*PLDSIZE] .Lneon_f2b_copy_128_loop_outer: pld [r1, #(PLDOFFS*PLDSIZE)] vld1.32 {q0,q1}, [r1]! vld1.32 {q2,q3}, [r1]! vld1.32 {q8,q9}, [r1]! vld1.32 {q10,q11}, [r1]! subs r12, r12, #1 vst1.32 {q0,q1}, [r0]! vst1.32 {q2,q3}, [r0]! vst1.32 {q8,q9}, [r0]! vst1.32 {q10,q11}, [r0]! bne .Lneon_f2b_copy_128_loop_outer mov r12, #PLDOFFS .Lneon_f2b_copy_128_loop_nopld: vld1.32 {q0,q1}, [r1]! vld1.32 {q2,q3}, [r1]! vld1.32 {q8,q9}, [r1]! vld1.32 {q10,q11}, [r1]! subs r12, r12, #1 vst1.32 {q0,q1}, [r0]! vst1.32 {q2,q3}, [r0]! vst1.32 {q8,q9}, [r0]! vst1.32 {q10,q11}, [r0]! bne .Lneon_f2b_copy_128_loop_nopld ands r2, r2, #0x7f beq .Lneon_memmove_done cmp r2, #32 bge .Lneon_f2b_copy_32 b .Lneon_f2b_copy_finish .Lneon_f2b_copy_32: mov r12, r2, lsr #5 .Lneon_f2b_copy_32_loop: vld1.32 {q0,q1}, [r1]! subs r12, r12, #1 vst1.32 {q0,q1}, [r0]! bne .Lneon_f2b_copy_32_loop ands r2, r2, #0x1f beq .Lneon_memmove_done .Lneon_f2b_copy_finish: .Lneon_f2b_copy_16: movs r12, r2, lsr #4 beq .Lneon_f2b_copy_8 .Lneon_f2b_copy_16_loop: vld1.32 {q0}, [r1]! subs r12, r12, #1 vst1.32 {q0}, [r0]! bne .Lneon_f2b_copy_16_loop ands r2, r2, #0xf beq .Lneon_memmove_done .Lneon_f2b_copy_8: movs r12, r2, lsr #3 beq .Lneon_f2b_copy_4 .Lneon_f2b_copy_8_loop: vld1.32 {d0}, [r1]! subs r12, r12, #1 vst1.32 {d0}, [r0]! bne .Lneon_f2b_copy_8_loop ands r2, r2, #0x7 beq .Lneon_memmove_done .Lneon_f2b_copy_4: movs r12, r2, lsr #2 beq .Lneon_f2b_copy_1 .Lneon_f2b_copy_4_loop: ldr r3, [r1], #4 subs r12, r12, #1 str r3, [r0], #4 bne .Lneon_f2b_copy_4_loop ands r2, r2, #0x3 nop .Lneon_f2b_copy_1: cmp r2, #0 beq .Lneon_memmove_done .Lneon_f2b_copy_1_loop: ldrb r12, [r1], #1 subs r2, r2, #1 strb r12, [r0], #1 bne .Lneon_f2b_copy_1_loop .Lneon_f2b_finish: b .Lneon_memmove_done /* ############################################################# * Back to Front copy */ .Lneon_back_to_front_copy: /* * Here, we'll want to shift to the end of the buffers. This * actually points us one past where we need to go, but since * we'll pre-decrement throughout, this will be fine. */ add r0, r0, r2 add r1, r1, r2 cmp r2, #4 bgt .Lneon_b2f_gt4 cmp r2, #0 .Lneon_b2f_smallcopy_loop: beq .Lneon_memmove_done ldrb r12, [r1, #-1]! subs r2, r2, #1 strb r12, [r0, #-1]! b .Lneon_b2f_smallcopy_loop .Lneon_b2f_gt4: /* * The minimum of the overlap window size and the copy size * is in r3. */ sub r3, r0, r1 /* * ############################################################# * Back to Front copy - */ cmp r2, r3 movle r12, r2 movgt r12, r3 cmp r12, #256 bge .Lneon_b2f_copy_128 cmp r12, #64 bge .Lneon_b2f_copy_32 cmp r12, #8 bge .Lneon_b2f_copy_8 cmp r12, #4 bge .Lneon_b2f_copy_4 b .Lneon_b2f_copy_1 nop .Lneon_b2f_copy_128: movs r12, r2, lsr #7 cmp r12, #PLDOFFS ble .Lneon_b2f_copy_128_loop_nopld sub r12, #PLDOFFS pld [r1, #-(PLDOFFS-1)*PLDSIZE] .Lneon_b2f_copy_128_loop_outer: pld [r1, #-(PLDOFFS*PLDSIZE)] sub r1, r1, #128 sub r0, r0, #128 vld1.32 {q0, q1}, [r1]! vld1.32 {q2, q3}, [r1]! vld1.32 {q8, q9}, [r1]! vld1.32 {q10, q11}, [r1]! subs r12, r12, #1 vst1.32 {q0, q1}, [r0]! vst1.32 {q2, q3}, [r0]! vst1.32 {q8, q9}, [r0]! vst1.32 {q10, q11}, [r0]! sub r1, r1, #128 sub r0, r0, #128 bne .Lneon_b2f_copy_128_loop_outer mov r12, #PLDOFFS .Lneon_b2f_copy_128_loop_nopld: sub r1, r1, #128 sub r0, r0, #128 vld1.32 {q0, q1}, [r1]! vld1.32 {q2, q3}, [r1]! vld1.32 {q8, q9}, [r1]! vld1.32 {q10, q11}, [r1]! subs r12, r12, #1 vst1.32 {q0, q1}, [r0]! vst1.32 {q2, q3}, [r0]! vst1.32 {q8, q9}, [r0]! vst1.32 {q10, q11}, [r0]! sub r1, r1, #128 sub r0, r0, #128 bne .Lneon_b2f_copy_128_loop_nopld ands r2, r2, #0x7f beq .Lneon_memmove_done cmp r2, #32 bge .Lneon_b2f_copy_32 b .Lneon_b2f_copy_finish .Lneon_b2f_copy_32: mov r12, r2, lsr #5 .Lneon_b2f_copy_32_loop: sub r1, r1, #32 sub r0, r0, #32 vld1.32 {q0,q1}, [r1] subs r12, r12, #1 vst1.32 {q0,q1}, [r0] bne .Lneon_b2f_copy_32_loop ands r2, r2, #0x1f beq .Lneon_memmove_done .Lneon_b2f_copy_finish: .Lneon_b2f_copy_8: movs r12, r2, lsr #0x3 beq .Lneon_b2f_copy_4 .Lneon_b2f_copy_8_loop: sub r1, r1, #8 sub r0, r0, #8 vld1.32 {d0}, [r1] subs r12, r12, #1 vst1.32 {d0}, [r0] bne .Lneon_b2f_copy_8_loop ands r2, r2, #0x7 beq .Lneon_memmove_done .Lneon_b2f_copy_4: movs r12, r2, lsr #0x2 beq .Lneon_b2f_copy_1 .Lneon_b2f_copy_4_loop: ldr r3, [r1, #-4]! subs r12, r12, #1 str r3, [r0, #-4]! bne .Lneon_b2f_copy_4_loop ands r2, r2, #0x3 nop .Lneon_b2f_copy_1: cmp r2, #0 beq .Lneon_memmove_done .Lneon_b2f_copy_1_loop: ldrb r12, [r1, #-1]! subs r2, r2, #1 strb r12, [r0, #-1]! bne .Lneon_b2f_copy_1_loop .Lneon_memmove_done: pop {r0} bx lr .end #endif /* SCORPION_NEON_OPTIMIZATION */