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Giuseppe CAVALLARO d53e4307c2 sh: Use GCC __builtin_prefetch() to implement prefetch(). ... GCC's __builtin_prefetch() was introduced a long time ago, all supported GCC versions have it. So this patch is to use it for implementing the prefetch on SH2A and SH4. The current prefetch implementation is almost equivalent with __builtin_prefetch. The third parameter in the __builtin_prefetch is the locality that it's not supported on SH architectures. It has been set to three and it should be verified if it's suitable for SH2A as well. I didn't test on this architecture. The builtin usage should be more efficient that an __asm__ because less barriers, and because the compiler doesn't see the inst as a "black box" allowing better code generation. This has been already done on other architectures (see the commit: 0453fb3c52). Many thanks to Christian Bruel <christain.bruel@st.com> for his support on evaluate the impact of the gcc built-in on SH4 arch. No regressions found while testing with LMbench on STLinux targets. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>		14 years ago
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boards	Merge branches 'sh/pio-death', 'sh/nommu', 'sh/clkfwk', 'sh/core' and 'sh/intc-extension' into sh-fixes-for-linus	14 years ago
boot	sh: boot kernel with SR.BL set	15 years ago
cchips	sh: hd64461: irq_data conversion.	14 years ago
configs	sh: mach-systemh: Kill off dead board.	14 years ago
drivers	sh: pci: Convert to upper/lower_32_bits() helpers.	15 years ago
include	sh: Use GCC __builtin_prefetch() to implement prefetch().	14 years ago
kernel	sh: fix vsyscall compilation due to .eh_frame issue	14 years ago
lib	sh: change to new flag variable	15 years ago
lib64	sh64: Kill off special clear_page() implementation.	16 years ago
math-emu	sh: wire up perf alignment and emulation faults.	15 years ago
mm	sh: nommu: use 32-bit phys mode.	14 years ago
oprofile	sh: oprofile: Make sure the backtrace op is available for timer-fallback.	14 years ago
tools	sh: mach-systemh: Kill off dead board.	14 years ago
Kconfig	sh: nommu: use 32-bit phys mode.	14 years ago
Kconfig.cpu	sh: Turn on speculative return for SH7785 and SH7786	15 years ago
Kconfig.debug	sh: Remove old early serial console code V2	15 years ago
Makefile	sh: mach-edosk7705: Kill off machtype, consolidate board def.	14 years ago