mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-04-29 12:28:27 +02:00
Heiko Carstens
4335edb713
Remove superfluous newlines from inline assemblies. Compilers use the number of lines of inline assemblies as heuristic for the complexity and inline decisions. Therefore inline assemblies should only contain as many lines as required. A lot of inline assemblies contain a superfluous newline for the last line. Remove such newlines to improve compiler inlining decisions. Suggested-by: Juergen Christ <jchrist@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Juergen Christ <jchrist@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Optimized xor_block operation for RAID4/5
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*
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* Copyright IBM Corp. 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/export.h>
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#include <linux/raid/xor.h>
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#include <asm/xor.h>
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static void xor_xc_2(unsigned long bytes, unsigned long * __restrict p1,
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const unsigned long * __restrict p2)
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{
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asm volatile(
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" aghi %0,-1\n"
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" jm 3f\n"
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" srlg 0,%0,8\n"
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" ltgr 0,0\n"
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" jz 1f\n"
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"0: xc 0(256,%1),0(%2)\n"
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" la %1,256(%1)\n"
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" la %2,256(%2)\n"
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" brctg 0,0b\n"
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"1: exrl %0,2f\n"
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" j 3f\n"
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"2: xc 0(1,%1),0(%2)\n"
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"3:"
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: : "d" (bytes), "a" (p1), "a" (p2)
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: "0", "cc", "memory");
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}
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static void xor_xc_3(unsigned long bytes, unsigned long * __restrict p1,
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const unsigned long * __restrict p2,
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const unsigned long * __restrict p3)
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{
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asm volatile(
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" aghi %0,-1\n"
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" jm 4f\n"
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" srlg 0,%0,8\n"
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" ltgr 0,0\n"
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" jz 1f\n"
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"0: xc 0(256,%1),0(%2)\n"
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" xc 0(256,%1),0(%3)\n"
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" la %1,256(%1)\n"
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" la %2,256(%2)\n"
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" la %3,256(%3)\n"
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" brctg 0,0b\n"
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"1: exrl %0,2f\n"
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" exrl %0,3f\n"
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" j 4f\n"
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"2: xc 0(1,%1),0(%2)\n"
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"3: xc 0(1,%1),0(%3)\n"
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"4:"
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: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
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: : "0", "cc", "memory");
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}
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static void xor_xc_4(unsigned long bytes, unsigned long * __restrict p1,
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const unsigned long * __restrict p2,
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const unsigned long * __restrict p3,
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const unsigned long * __restrict p4)
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{
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asm volatile(
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" aghi %0,-1\n"
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" jm 5f\n"
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" srlg 0,%0,8\n"
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" ltgr 0,0\n"
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" jz 1f\n"
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"0: xc 0(256,%1),0(%2)\n"
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" xc 0(256,%1),0(%3)\n"
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" xc 0(256,%1),0(%4)\n"
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" la %1,256(%1)\n"
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" la %2,256(%2)\n"
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" la %3,256(%3)\n"
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" la %4,256(%4)\n"
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" brctg 0,0b\n"
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"1: exrl %0,2f\n"
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" exrl %0,3f\n"
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" exrl %0,4f\n"
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" j 5f\n"
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"2: xc 0(1,%1),0(%2)\n"
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"3: xc 0(1,%1),0(%3)\n"
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"4: xc 0(1,%1),0(%4)\n"
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"5:"
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: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
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: : "0", "cc", "memory");
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}
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static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
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const unsigned long * __restrict p2,
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const unsigned long * __restrict p3,
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const unsigned long * __restrict p4,
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const unsigned long * __restrict p5)
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{
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asm volatile(
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" larl 1,2f\n"
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" aghi %0,-1\n"
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" jm 6f\n"
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" srlg 0,%0,8\n"
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" ltgr 0,0\n"
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" jz 1f\n"
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"0: xc 0(256,%1),0(%2)\n"
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" xc 0(256,%1),0(%3)\n"
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" xc 0(256,%1),0(%4)\n"
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" xc 0(256,%1),0(%5)\n"
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" la %1,256(%1)\n"
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" la %2,256(%2)\n"
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" la %3,256(%3)\n"
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" la %4,256(%4)\n"
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" la %5,256(%5)\n"
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" brctg 0,0b\n"
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"1: exrl %0,2f\n"
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" exrl %0,3f\n"
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" exrl %0,4f\n"
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" exrl %0,5f\n"
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" j 6f\n"
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"2: xc 0(1,%1),0(%2)\n"
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"3: xc 0(1,%1),0(%3)\n"
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"4: xc 0(1,%1),0(%4)\n"
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"5: xc 0(1,%1),0(%5)\n"
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"6:"
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: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
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"+a" (p5)
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: : "0", "cc", "memory");
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}
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struct xor_block_template xor_block_xc = {
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.name = "xc",
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.do_2 = xor_xc_2,
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.do_3 = xor_xc_3,
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.do_4 = xor_xc_4,
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.do_5 = xor_xc_5,
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};
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EXPORT_SYMBOL(xor_block_xc);
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