mirror of
https://github.com/opnsense/src.git
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9535440569
Tested with glibc test suite.
The C variant in libkern performs excessive branching to find the zero
byte instead of using the bsfq instruction. The same code patched to use
it is still slower than the routine implemented here as the compiler
keeps neglecting to perform certain optimizations (like using leaq).
On top of that the routine can be used as a starting point for copyinstr
which operates on words intead of bytes.
The previous attempt had an instance of swapped operands to andq when
dealing with fully aligned case, which had a side effect of breaking the
code for certain corner cases. Noted by jrtc27.
Sample results:
$(perl -e "print 'A' x 3"):
stock: 211198039
patched:338626619
asm: 465609618
$(perl -e "print 'A' x 100"):
stock: 83151997
patched: 98285919
asm: 120719888
Reviewed by: jhb, kib
Differential Revision: https://reviews.freebsd.org/D28779
(cherry picked from commit 5fa12fe0cd)
115 lines
3.7 KiB
Text
115 lines
3.7 KiB
Text
# This file tells config what files go into building a kernel,
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# files marked standard are always included.
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#
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# $FreeBSD$
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#
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# Arch dependent files
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mips/mips/autoconf.c standard
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mips/mips/bus_space_generic.c standard
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mips/mips/busdma_machdep.c standard
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mips/mips/cache.c standard
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mips/mips/cache_mipsNN.c standard
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mips/mips/cpu.c standard
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mips/mips/db_disasm.c optional ddb
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mips/mips/db_interface.c optional ddb
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mips/mips/db_trace.c optional ddb
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mips/mips/dump_machdep.c standard
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mips/mips/elf_machdep.c standard
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mips/mips/exception.S standard
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mips/mips/fp.S standard
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mips/mips/freebsd32_machdep.c optional compat_freebsd32
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mips/mips/gdb_machdep.c standard
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mips/mips/in_cksum.c optional inet
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mips/mips/libkern_machdep.c standard
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mips/mips/locore.S standard no-obj
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mips/mips/machdep.c standard
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mips/mips/mem.c optional mem
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mips/mips/minidump_machdep.c standard
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mips/mips/mp_machdep.c optional smp
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mips/mips/mpboot.S optional smp
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mips/mips/nexus.c standard
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mips/mips/ofw_machdep.c optional fdt
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mips/mips/pm_machdep.c standard
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mips/mips/pmap.c standard
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mips/mips/ptrace_machdep.c standard
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mips/mips/sc_machdep.c standard
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mips/mips/stack_machdep.c optional ddb | stack
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mips/mips/stdatomic.c standard \
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compile-with "${NORMAL_C:N-Wmissing-prototypes}"
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mips/mips/support.S standard
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mips/mips/bcopy.S standard
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mips/mips/swtch.S standard
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mips/mips/sys_machdep.c standard
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mips/mips/tlb.c standard
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mips/mips/trap.c standard
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mips/mips/uio_machdep.c standard
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mips/mips/uma_machdep.c standard
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mips/mips/vm_machdep.c standard
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# misc opt-in bits
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kern/link_elf_obj.c standard
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kern/subr_atomic64.c optional mips | mipsel | mipshf | mipselhf
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kern/subr_busdma_bufalloc.c standard
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kern/subr_dummy_vdso_tc.c standard
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kern/subr_sfbuf.c optional mips | mipsel | mipsn32
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kern/subr_sfbuf.c optional mipshf | mipselhf
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# gcc/clang runtime
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libkern/ffsl.c standard
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libkern/ffsll.c standard
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libkern/fls.c standard
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libkern/flsl.c standard
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libkern/flsll.c standard
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libkern/cmpdi2.c optional mips | mipshf | mipsel | mipselhf
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libkern/ucmpdi2.c optional mips | mipshf | mipsel | mipselhf
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libkern/ashldi3.c standard
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libkern/ashrdi3.c standard
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libkern/memcmp.c standard
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libkern/strlen.c standard
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# cfe support
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dev/cfe/cfe_api.c optional cfe
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dev/cfe/cfe_console.c optional cfe_console
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dev/cfe/cfe_env.c optional cfe_env
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# syscons support
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dev/fb/fb.c optional sc
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dev/syscons/scgfbrndr.c optional sc
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mips/mips/sc_machdep.c optional sc
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# FDT support
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dev/uart/uart_cpu_fdt.c optional uart fdt
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# crypto support -- use generic
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crypto/des/des_enc.c optional netsmb
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# AP common nvram interface MIPS specific, but maybe should be more generic
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dev/nvram2env/nvram2env_mips.c optional nvram2env
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dev/nvram2env/nvram2env.c optional nvram2env
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# hwpmc support
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dev/hwpmc/hwpmc_beri.c optional hwpmc_beri
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dev/hwpmc/hwpmc_mips.c optional hwpmc_mips24k | \
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hwpmc_mips74k
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dev/hwpmc/hwpmc_mips24k.c optional hwpmc_mips24k
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dev/hwpmc/hwpmc_mips74k.c optional hwpmc_mips74k
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# ofw support
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dev/ofw/ofwpci.c optional fdt pci
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# INTRNG support code
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kern/msi_if.m optional intrng
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kern/pic_if.m optional intrng
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kern/subr_intr.c optional intrng
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# INTRNG compatible MIPS32 interrupt controller
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mips/mips/mips_pic.c optional intrng
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# DTrace
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cddl/compat/opensolaris/kern/opensolaris_atomic.c optional zfs | dtrace compile-with "${CDDL_C}"
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cddl/dev/dtrace/mips/dtrace_asm.S optional dtrace compile-with "${DTRACE_S}"
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cddl/dev/dtrace/mips/dtrace_subr.c optional dtrace compile-with "${DTRACE_C}"
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cddl/dev/fbt/mips/fbt_isa.c optional dtrace_fbt | dtraceall compile-with "${FBT_C}"
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# Zstd
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contrib/zstd/lib/freebsd/zstd_kfreebsd.c optional zstdio compile-with ${ZSTD_C}
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