mirror of https://gitee.com/openkylin/linux.git
Merge branch 'x86-mem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-mem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, mem: Optimize memmove for small size and unaligned cases x86, mem: Optimize memcpy by avoiding memory false dependece x86, mem: Don't implement forward memmove() as memcpy()
This commit is contained in:
Linus Torvalds
commit
8d8d2e9ccd
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@ -22,22 +22,187 @@ EXPORT_SYMBOL(memset);
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void *memmove(void *dest, const void *src, size_t n)
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{
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int d0, d1, d2;
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int d0,d1,d2,d3,d4,d5;
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char *ret = dest;
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__asm__ __volatile__(
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/* Handle more 16bytes in loop */
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"cmp $0x10, %0\n\t"
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"jb 1f\n\t"
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/* Decide forward/backward copy mode */
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"cmp %2, %1\n\t"
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"jb 2f\n\t"
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/*
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* movs instruction have many startup latency
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* so we handle small size by general register.
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*/
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"cmp $680, %0\n\t"
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"jb 3f\n\t"
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/*
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* movs instruction is only good for aligned case.
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*/
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"mov %1, %3\n\t"
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"xor %2, %3\n\t"
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"and $0xff, %3\n\t"
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"jz 4f\n\t"
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"3:\n\t"
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"sub $0x10, %0\n\t"
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/*
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* We gobble 16byts forward in each loop.
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*/
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"3:\n\t"
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"sub $0x10, %0\n\t"
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"mov 0*4(%1), %3\n\t"
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"mov 1*4(%1), %4\n\t"
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"mov %3, 0*4(%2)\n\t"
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"mov %4, 1*4(%2)\n\t"
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"mov 2*4(%1), %3\n\t"
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"mov 3*4(%1), %4\n\t"
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"mov %3, 2*4(%2)\n\t"
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"mov %4, 3*4(%2)\n\t"
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"lea 0x10(%1), %1\n\t"
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"lea 0x10(%2), %2\n\t"
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"jae 3b\n\t"
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"add $0x10, %0\n\t"
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"jmp 1f\n\t"
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/*
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* Handle data forward by movs.
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*/
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".p2align 4\n\t"
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"4:\n\t"
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"mov -4(%1, %0), %3\n\t"
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"lea -4(%2, %0), %4\n\t"
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"shr $2, %0\n\t"
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"rep movsl\n\t"
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"mov %3, (%4)\n\t"
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"jmp 11f\n\t"
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/*
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* Handle data backward by movs.
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*/
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".p2align 4\n\t"
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"6:\n\t"
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"mov (%1), %3\n\t"
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"mov %2, %4\n\t"
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"lea -4(%1, %0), %1\n\t"
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"lea -4(%2, %0), %2\n\t"
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"shr $2, %0\n\t"
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"std\n\t"
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"rep movsl\n\t"
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"mov %3,(%4)\n\t"
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"cld\n\t"
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"jmp 11f\n\t"
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/*
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* Start to prepare for backward copy.
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*/
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".p2align 4\n\t"
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"2:\n\t"
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"cmp $680, %0\n\t"
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"jb 5f\n\t"
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"mov %1, %3\n\t"
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"xor %2, %3\n\t"
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"and $0xff, %3\n\t"
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"jz 6b\n\t"
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/*
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* Calculate copy position to tail.
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*/
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"5:\n\t"
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"add %0, %1\n\t"
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"add %0, %2\n\t"
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"sub $0x10, %0\n\t"
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/*
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* We gobble 16byts backward in each loop.
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*/
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"7:\n\t"
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"sub $0x10, %0\n\t"
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"mov -1*4(%1), %3\n\t"
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"mov -2*4(%1), %4\n\t"
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"mov %3, -1*4(%2)\n\t"
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"mov %4, -2*4(%2)\n\t"
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"mov -3*4(%1), %3\n\t"
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"mov -4*4(%1), %4\n\t"
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"mov %3, -3*4(%2)\n\t"
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"mov %4, -4*4(%2)\n\t"
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"lea -0x10(%1), %1\n\t"
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"lea -0x10(%2), %2\n\t"
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"jae 7b\n\t"
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/*
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* Calculate copy position to head.
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*/
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"add $0x10, %0\n\t"
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"sub %0, %1\n\t"
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"sub %0, %2\n\t"
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/*
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* Move data from 8 bytes to 15 bytes.
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*/
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".p2align 4\n\t"
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"1:\n\t"
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"cmp $8, %0\n\t"
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"jb 8f\n\t"
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"mov 0*4(%1), %3\n\t"
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"mov 1*4(%1), %4\n\t"
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"mov -2*4(%1, %0), %5\n\t"
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"mov -1*4(%1, %0), %1\n\t"
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"mov %3, 0*4(%2)\n\t"
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"mov %4, 1*4(%2)\n\t"
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"mov %5, -2*4(%2, %0)\n\t"
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"mov %1, -1*4(%2, %0)\n\t"
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"jmp 11f\n\t"
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/*
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* Move data from 4 bytes to 7 bytes.
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*/
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".p2align 4\n\t"
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"8:\n\t"
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"cmp $4, %0\n\t"
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"jb 9f\n\t"
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"mov 0*4(%1), %3\n\t"
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"mov -1*4(%1, %0), %4\n\t"
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"mov %3, 0*4(%2)\n\t"
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"mov %4, -1*4(%2, %0)\n\t"
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"jmp 11f\n\t"
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/*
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* Move data from 2 bytes to 3 bytes.
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*/
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".p2align 4\n\t"
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"9:\n\t"
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"cmp $2, %0\n\t"
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"jb 10f\n\t"
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"movw 0*2(%1), %%dx\n\t"
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"movw -1*2(%1, %0), %%bx\n\t"
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"movw %%dx, 0*2(%2)\n\t"
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"movw %%bx, -1*2(%2, %0)\n\t"
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"jmp 11f\n\t"
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/*
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* Move data for 1 byte.
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*/
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".p2align 4\n\t"
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"10:\n\t"
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"cmp $1, %0\n\t"
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"jb 11f\n\t"
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"movb (%1), %%cl\n\t"
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"movb %%cl, (%2)\n\t"
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".p2align 4\n\t"
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"11:"
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: "=&c" (d0), "=&S" (d1), "=&D" (d2),
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"=r" (d3),"=r" (d4), "=r"(d5)
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:"0" (n),
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"1" (src),
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"2" (dest)
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:"memory");
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return ret;
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if (dest < src) {
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memcpy(dest, src, n);
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} else {
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__asm__ __volatile__(
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"std\n\t"
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"rep\n\t"
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"movsb\n\t"
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"cld"
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: "=&c" (d0), "=&S" (d1), "=&D" (d2)
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:"0" (n),
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"1" (n-1+src),
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"2" (n-1+dest)
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:"memory");
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}
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return dest;
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}
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EXPORT_SYMBOL(memmove);
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@ -40,84 +40,132 @@
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ENTRY(__memcpy)
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ENTRY(memcpy)
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CFI_STARTPROC
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/*
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* Put the number of full 64-byte blocks into %ecx.
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* Tail portion is handled at the end:
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*/
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movq %rdi, %rax
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movl %edx, %ecx
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shrl $6, %ecx
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jz .Lhandle_tail
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/*
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* Use 32bit CMP here to avoid long NOP padding.
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*/
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cmp $0x20, %edx
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jb .Lhandle_tail
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/*
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* We check whether memory false dependece could occur,
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* then jump to corresponding copy mode.
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*/
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cmp %dil, %sil
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jl .Lcopy_backward
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subl $0x20, %edx
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.Lcopy_forward_loop:
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subq $0x20, %rdx
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/*
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* Move in blocks of 4x8 bytes:
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*/
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movq 0*8(%rsi), %r8
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movq 1*8(%rsi), %r9
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movq 2*8(%rsi), %r10
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movq 3*8(%rsi), %r11
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leaq 4*8(%rsi), %rsi
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movq %r8, 0*8(%rdi)
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movq %r9, 1*8(%rdi)
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movq %r10, 2*8(%rdi)
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movq %r11, 3*8(%rdi)
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leaq 4*8(%rdi), %rdi
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jae .Lcopy_forward_loop
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addq $0x20, %rdx
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jmp .Lhandle_tail
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.Lcopy_backward:
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/*
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* Calculate copy position to tail.
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*/
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addq %rdx, %rsi
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addq %rdx, %rdi
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subq $0x20, %rdx
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/*
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* At most 3 ALU operations in one cycle,
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* so append NOPS in the same 16bytes trunk.
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*/
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.p2align 4
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.Lloop_64:
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/*
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* We decrement the loop index here - and the zero-flag is
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* checked at the end of the loop (instructions inbetween do
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* not change the zero flag):
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*/
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decl %ecx
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.Lcopy_backward_loop:
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subq $0x20, %rdx
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movq -1*8(%rsi), %r8
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movq -2*8(%rsi), %r9
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movq -3*8(%rsi), %r10
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movq -4*8(%rsi), %r11
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leaq -4*8(%rsi), %rsi
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movq %r8, -1*8(%rdi)
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movq %r9, -2*8(%rdi)
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movq %r10, -3*8(%rdi)
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movq %r11, -4*8(%rdi)
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leaq -4*8(%rdi), %rdi
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jae .Lcopy_backward_loop
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/*
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* Move in blocks of 4x16 bytes:
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* Calculate copy position to head.
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*/
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movq 0*8(%rsi), %r11
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movq 1*8(%rsi), %r8
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movq %r11, 0*8(%rdi)
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movq %r8, 1*8(%rdi)
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movq 2*8(%rsi), %r9
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movq 3*8(%rsi), %r10
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movq %r9, 2*8(%rdi)
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movq %r10, 3*8(%rdi)
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movq 4*8(%rsi), %r11
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movq 5*8(%rsi), %r8
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movq %r11, 4*8(%rdi)
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movq %r8, 5*8(%rdi)
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movq 6*8(%rsi), %r9
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movq 7*8(%rsi), %r10
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movq %r9, 6*8(%rdi)
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movq %r10, 7*8(%rdi)
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leaq 64(%rsi), %rsi
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leaq 64(%rdi), %rdi
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jnz .Lloop_64
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addq $0x20, %rdx
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subq %rdx, %rsi
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subq %rdx, %rdi
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.Lhandle_tail:
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movl %edx, %ecx
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andl $63, %ecx
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shrl $3, %ecx
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jz .Lhandle_7
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cmpq $16, %rdx
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jb .Lless_16bytes
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/*
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* Move data from 16 bytes to 31 bytes.
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*/
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movq 0*8(%rsi), %r8
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movq 1*8(%rsi), %r9
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movq -2*8(%rsi, %rdx), %r10
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movq -1*8(%rsi, %rdx), %r11
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movq %r8, 0*8(%rdi)
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||||
movq %r9, 1*8(%rdi)
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movq %r10, -2*8(%rdi, %rdx)
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movq %r11, -1*8(%rdi, %rdx)
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retq
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.p2align 4
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.Lloop_8:
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||||
decl %ecx
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||||
movq (%rsi), %r8
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||||
movq %r8, (%rdi)
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||||
leaq 8(%rdi), %rdi
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||||
leaq 8(%rsi), %rsi
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||||
jnz .Lloop_8
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||||
|
||||
.Lhandle_7:
|
||||
movl %edx, %ecx
|
||||
andl $7, %ecx
|
||||
jz .Lend
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||||
|
||||
.Lless_16bytes:
|
||||
cmpq $8, %rdx
|
||||
jb .Lless_8bytes
|
||||
/*
|
||||
* Move data from 8 bytes to 15 bytes.
|
||||
*/
|
||||
movq 0*8(%rsi), %r8
|
||||
movq -1*8(%rsi, %rdx), %r9
|
||||
movq %r8, 0*8(%rdi)
|
||||
movq %r9, -1*8(%rdi, %rdx)
|
||||
retq
|
||||
.p2align 4
|
||||
.Lless_8bytes:
|
||||
cmpq $4, %rdx
|
||||
jb .Lless_3bytes
|
||||
|
||||
/*
|
||||
* Move data from 4 bytes to 7 bytes.
|
||||
*/
|
||||
movl (%rsi), %ecx
|
||||
movl -4(%rsi, %rdx), %r8d
|
||||
movl %ecx, (%rdi)
|
||||
movl %r8d, -4(%rdi, %rdx)
|
||||
retq
|
||||
.p2align 4
|
||||
.Lless_3bytes:
|
||||
cmpl $0, %edx
|
||||
je .Lend
|
||||
/*
|
||||
* Move data from 1 bytes to 3 bytes.
|
||||
*/
|
||||
.Lloop_1:
|
||||
movb (%rsi), %r8b
|
||||
movb %r8b, (%rdi)
|
||||
incq %rdi
|
||||
incq %rsi
|
||||
decl %ecx
|
||||
decl %edx
|
||||
jnz .Lloop_1
|
||||
|
||||
.Lend:
|
||||
ret
|
||||
retq
|
||||
CFI_ENDPROC
|
||||
ENDPROC(memcpy)
|
||||
ENDPROC(__memcpy)
|
||||
|
|
|
|||
|
|
@ -8,14 +8,185 @@
|
|||
#undef memmove
|
||||
void *memmove(void *dest, const void *src, size_t count)
|
||||
{
|
||||
if (dest < src) {
|
||||
return memcpy(dest, src, count);
|
||||
} else {
|
||||
char *p = dest + count;
|
||||
const char *s = src + count;
|
||||
while (count--)
|
||||
*--p = *--s;
|
||||
}
|
||||
return dest;
|
||||
unsigned long d0,d1,d2,d3,d4,d5,d6,d7;
|
||||
char *ret;
|
||||
|
||||
__asm__ __volatile__(
|
||||
/* Handle more 32bytes in loop */
|
||||
"mov %2, %3\n\t"
|
||||
"cmp $0x20, %0\n\t"
|
||||
"jb 1f\n\t"
|
||||
|
||||
/* Decide forward/backward copy mode */
|
||||
"cmp %2, %1\n\t"
|
||||
"jb 2f\n\t"
|
||||
|
||||
/*
|
||||
* movsq instruction have many startup latency
|
||||
* so we handle small size by general register.
|
||||
*/
|
||||
"cmp $680, %0\n\t"
|
||||
"jb 3f\n\t"
|
||||
/*
|
||||
* movsq instruction is only good for aligned case.
|
||||
*/
|
||||
"cmpb %%dil, %%sil\n\t"
|
||||
"je 4f\n\t"
|
||||
"3:\n\t"
|
||||
"sub $0x20, %0\n\t"
|
||||
/*
|
||||
* We gobble 32byts forward in each loop.
|
||||
*/
|
||||
"5:\n\t"
|
||||
"sub $0x20, %0\n\t"
|
||||
"movq 0*8(%1), %4\n\t"
|
||||
"movq 1*8(%1), %5\n\t"
|
||||
"movq 2*8(%1), %6\n\t"
|
||||
"movq 3*8(%1), %7\n\t"
|
||||
"leaq 4*8(%1), %1\n\t"
|
||||
|
||||
"movq %4, 0*8(%2)\n\t"
|
||||
"movq %5, 1*8(%2)\n\t"
|
||||
"movq %6, 2*8(%2)\n\t"
|
||||
"movq %7, 3*8(%2)\n\t"
|
||||
"leaq 4*8(%2), %2\n\t"
|
||||
"jae 5b\n\t"
|
||||
"addq $0x20, %0\n\t"
|
||||
"jmp 1f\n\t"
|
||||
/*
|
||||
* Handle data forward by movsq.
|
||||
*/
|
||||
".p2align 4\n\t"
|
||||
"4:\n\t"
|
||||
"movq %0, %8\n\t"
|
||||
"movq -8(%1, %0), %4\n\t"
|
||||
"lea -8(%2, %0), %5\n\t"
|
||||
"shrq $3, %8\n\t"
|
||||
"rep movsq\n\t"
|
||||
"movq %4, (%5)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
/*
|
||||
* Handle data backward by movsq.
|
||||
*/
|
||||
".p2align 4\n\t"
|
||||
"7:\n\t"
|
||||
"movq %0, %8\n\t"
|
||||
"movq (%1), %4\n\t"
|
||||
"movq %2, %5\n\t"
|
||||
"leaq -8(%1, %0), %1\n\t"
|
||||
"leaq -8(%2, %0), %2\n\t"
|
||||
"shrq $3, %8\n\t"
|
||||
"std\n\t"
|
||||
"rep movsq\n\t"
|
||||
"cld\n\t"
|
||||
"movq %4, (%5)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
|
||||
/*
|
||||
* Start to prepare for backward copy.
|
||||
*/
|
||||
".p2align 4\n\t"
|
||||
"2:\n\t"
|
||||
"cmp $680, %0\n\t"
|
||||
"jb 6f \n\t"
|
||||
"cmp %%dil, %%sil\n\t"
|
||||
"je 7b \n\t"
|
||||
"6:\n\t"
|
||||
/*
|
||||
* Calculate copy position to tail.
|
||||
*/
|
||||
"addq %0, %1\n\t"
|
||||
"addq %0, %2\n\t"
|
||||
"subq $0x20, %0\n\t"
|
||||
/*
|
||||
* We gobble 32byts backward in each loop.
|
||||
*/
|
||||
"8:\n\t"
|
||||
"subq $0x20, %0\n\t"
|
||||
"movq -1*8(%1), %4\n\t"
|
||||
"movq -2*8(%1), %5\n\t"
|
||||
"movq -3*8(%1), %6\n\t"
|
||||
"movq -4*8(%1), %7\n\t"
|
||||
"leaq -4*8(%1), %1\n\t"
|
||||
|
||||
"movq %4, -1*8(%2)\n\t"
|
||||
"movq %5, -2*8(%2)\n\t"
|
||||
"movq %6, -3*8(%2)\n\t"
|
||||
"movq %7, -4*8(%2)\n\t"
|
||||
"leaq -4*8(%2), %2\n\t"
|
||||
"jae 8b\n\t"
|
||||
/*
|
||||
* Calculate copy position to head.
|
||||
*/
|
||||
"addq $0x20, %0\n\t"
|
||||
"subq %0, %1\n\t"
|
||||
"subq %0, %2\n\t"
|
||||
"1:\n\t"
|
||||
"cmpq $16, %0\n\t"
|
||||
"jb 9f\n\t"
|
||||
/*
|
||||
* Move data from 16 bytes to 31 bytes.
|
||||
*/
|
||||
"movq 0*8(%1), %4\n\t"
|
||||
"movq 1*8(%1), %5\n\t"
|
||||
"movq -2*8(%1, %0), %6\n\t"
|
||||
"movq -1*8(%1, %0), %7\n\t"
|
||||
"movq %4, 0*8(%2)\n\t"
|
||||
"movq %5, 1*8(%2)\n\t"
|
||||
"movq %6, -2*8(%2, %0)\n\t"
|
||||
"movq %7, -1*8(%2, %0)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
".p2align 4\n\t"
|
||||
"9:\n\t"
|
||||
"cmpq $8, %0\n\t"
|
||||
"jb 10f\n\t"
|
||||
/*
|
||||
* Move data from 8 bytes to 15 bytes.
|
||||
*/
|
||||
"movq 0*8(%1), %4\n\t"
|
||||
"movq -1*8(%1, %0), %5\n\t"
|
||||
"movq %4, 0*8(%2)\n\t"
|
||||
"movq %5, -1*8(%2, %0)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
"10:\n\t"
|
||||
"cmpq $4, %0\n\t"
|
||||
"jb 11f\n\t"
|
||||
/*
|
||||
* Move data from 4 bytes to 7 bytes.
|
||||
*/
|
||||
"movl (%1), %4d\n\t"
|
||||
"movl -4(%1, %0), %5d\n\t"
|
||||
"movl %4d, (%2)\n\t"
|
||||
"movl %5d, -4(%2, %0)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
"11:\n\t"
|
||||
"cmp $2, %0\n\t"
|
||||
"jb 12f\n\t"
|
||||
/*
|
||||
* Move data from 2 bytes to 3 bytes.
|
||||
*/
|
||||
"movw (%1), %4w\n\t"
|
||||
"movw -2(%1, %0), %5w\n\t"
|
||||
"movw %4w, (%2)\n\t"
|
||||
"movw %5w, -2(%2, %0)\n\t"
|
||||
"jmp 13f\n\t"
|
||||
"12:\n\t"
|
||||
"cmp $1, %0\n\t"
|
||||
"jb 13f\n\t"
|
||||
/*
|
||||
* Move data for 1 byte.
|
||||
*/
|
||||
"movb (%1), %4b\n\t"
|
||||
"movb %4b, (%2)\n\t"
|
||||
"13:\n\t"
|
||||
: "=&d" (d0), "=&S" (d1), "=&D" (d2), "=&a" (ret) ,
|
||||
"=r"(d3), "=r"(d4), "=r"(d5), "=r"(d6), "=&c" (d7)
|
||||
:"0" (count),
|
||||
"1" (src),
|
||||
"2" (dest)
|
||||
:"memory");
|
||||
|
||||
return ret;
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(memmove);
|
||||
|
|
|
|||
Loading…
Reference in New Issue