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| author | Paul Burton <paul.burton@imgtec.com> | 2016-05-06 13:35:03 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:02:17 +0200 |
| commit | 87321fddaeb8706a91293dc244408697a0a24ece (patch) | |
| tree | 4a3de3864e8ccbaaa15417001e7a8fd2d5d7edcb /arch/mips/Kconfig | |
| parent | 015aa05f534adabff2e4380f5ae6ea0fe20ec321 (diff) | |
| download | talos-obmc-linux-87321fddaeb8706a91293dc244408697a0a24ece.tar.gz talos-obmc-linux-87321fddaeb8706a91293dc244408697a0a24ece.zip | |
MIPS: Implement __arch_bitrev* using bitswap for MIPSr6
Release 6 of the MIPS architecture introduced the bitswap instruction,
which reverses the bits within each byte of a word. Make use of this
instruction to implement the __arch_bitrev* functions, which should be
faster for most MIPSr6 CPUs, reduces code size slightly and allows us to
avoid the lookup table used by the generic implementation, saving 256
bytes in the kernel binary by dropping that.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13204/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 2b7af9014cce..95f05826a16f 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2000,6 +2000,7 @@ config CPU_MIPSR2 config CPU_MIPSR6 bool default y if CPU_MIPS32_R6 || CPU_MIPS64_R6 + select HAVE_ARCH_BITREVERSE select MIPS_SPRAM config EVA |
