a89262079e
Use of compiler builtin ffs/ctz functions will result in optimized instruction sequences when possible, and fall back to calling a function provided by the compiler run-time library. We have slowly shifted our platforms to take advantage of these builtins in60645781d6(arm64),1c76d3a9fb(arm),9e319462a0(powerpc, partial). Some platforms still rely on the libkern implementations of these functions provided by libkern, namely riscv, powerpc (ffs*, flsll), and i386 (ffsll and flsll). These routines are slow, as they perform a linear search for the bit in question. Even on platforms lacking dedicated bit-search instructions, such as riscv, the compiler library will provide better-optimized routines, e.g. by using binary search. Consolidate all definitions of these functions (whether currently using builtins or not) to libkern.h. This should result in equivalent or better performing routines in all cases. One wart in all of this is the existing HAVE_INLINE_F*** macros, which we use in a few places to conditionally avoid the slow libkern routines. These aren't easily removed in one commit. For now, provide these defines unconditionally, but marked for removal after subsequent cleanup. Removal of the now unused libkern routines will follow in the next commit. Reviewed by: dougm, imp (previous version) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D40698
75 lines
2.7 KiB
Plaintext
75 lines
2.7 KiB
Plaintext
# $FreeBSD$
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cddl/dev/dtrace/riscv/dtrace_asm.S optional dtrace compile-with "${DTRACE_S}"
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cddl/dev/dtrace/riscv/dtrace_subr.c optional dtrace compile-with "${DTRACE_C}"
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cddl/dev/dtrace/riscv/instr_size.c optional dtrace compile-with "${DTRACE_C}"
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cddl/dev/fbt/riscv/fbt_isa.c optional dtrace_fbt | dtraceall compile-with "${FBT_C}"
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crypto/des/des_enc.c optional netsmb
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dev/ofw/ofw_cpu.c optional fdt
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dev/ofw/ofw_pcib.c optional pci fdt
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dev/pci/pci_dw.c optional pci fdt
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dev/pci/pci_dw_if.m optional pci fdt
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dev/pci/pci_host_generic.c optional pci
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dev/pci/pci_host_generic_fdt.c optional pci fdt
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dev/uart/uart_cpu_fdt.c optional uart fdt
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dev/uart/uart_dev_lowrisc.c optional uart_lowrisc
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dev/xilinx/axi_quad_spi.c optional xilinx_spi
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dev/xilinx/axidma.c optional axidma xdma
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dev/xilinx/if_xae.c optional xae
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dev/xilinx/xlnx_pcib.c optional pci fdt xlnx_pcib
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kern/msi_if.m standard
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kern/pic_if.m standard
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kern/subr_devmap.c standard
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kern/subr_dummy_vdso_tc.c standard
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kern/subr_intr.c standard
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kern/subr_physmem.c standard
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libkern/bcopy.c standard
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libkern/memcmp.c standard
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libkern/memset.c standard
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libkern/strcmp.c standard
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libkern/strlen.c standard
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libkern/strncmp.c standard
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riscv/riscv/autoconf.c standard
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riscv/riscv/bus_machdep.c standard
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riscv/riscv/bus_space_asm.S standard
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riscv/riscv/busdma_bounce.c standard
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riscv/riscv/busdma_machdep.c standard
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riscv/riscv/clock.c standard
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riscv/riscv/copyinout.S standard
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riscv/riscv/cpufunc_asm.S standard
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riscv/riscv/db_disasm.c optional ddb
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riscv/riscv/db_interface.c optional ddb
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riscv/riscv/db_trace.c optional ddb
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riscv/riscv/dump_machdep.c standard
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riscv/riscv/elf_machdep.c standard
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riscv/riscv/exception.S standard
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riscv/riscv/exec_machdep.c standard
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riscv/riscv/gdb_machdep.c optional gdb
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riscv/riscv/intr_machdep.c standard
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riscv/riscv/identcpu.c standard
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riscv/riscv/locore.S standard no-obj
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riscv/riscv/machdep.c standard
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riscv/riscv/minidump_machdep.c standard
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riscv/riscv/mp_machdep.c optional smp
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riscv/riscv/mem.c standard
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riscv/riscv/nexus.c standard
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riscv/riscv/ofw_machdep.c optional fdt
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riscv/riscv/plic.c standard
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riscv/riscv/pmap.c standard
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riscv/riscv/ptrace_machdep.c standard
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riscv/riscv/riscv_console.c optional rcons
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riscv/riscv/riscv_syscon.c optional syscon riscv_syscon fdt
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riscv/riscv/sbi.c standard
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riscv/riscv/stack_machdep.c optional ddb | stack
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riscv/riscv/support.S standard
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riscv/riscv/swtch.S standard
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riscv/riscv/sys_machdep.c standard
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riscv/riscv/trap.c standard
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riscv/riscv/timer.c standard
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riscv/riscv/uio_machdep.c standard
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riscv/riscv/uma_machdep.c standard
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riscv/riscv/unwind.c optional ddb | kdtrace_hooks | stack
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riscv/riscv/vm_machdep.c standard
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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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