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>		2010-11-18 14:53:18 +09:00
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asm	sh: Use GCC __builtin_prefetch() to implement prefetch().	2010-11-18 14:53:18 +09:00
cpu-common/cpu
cpu-sh2/cpu
cpu-sh2a/cpu
cpu-sh3/cpu	sh: Fix up the SH-3 build.	2010-10-07 02:57:39 +09:00
cpu-sh4/cpu	sh: pinmux support for SH-X3 proto CPUs.	2010-10-02 19:20:51 +09:00
cpu-sh5/cpu
mach-common/mach	sh: mach-edosk7705: Kill off machtype, consolidate board def.	2010-10-29 19:38:19 +09:00
mach-dreamcast/mach
mach-ecovec24/mach
mach-kfr2r09/mach	sh: add a parameter to LCDC driver's .display_on() callback	2010-08-04 16:12:11 +09:00
mach-landisk/mach
mach-migor/mach
mach-sdk7786/mach	sh: mach-sdk7786: Add support for the FPGA SRAM.	2010-10-15 02:13:04 +09:00
mach-se/mach
mach-sh03/mach
mach-x3proto/mach	sh: mach-x3proto: Support for baseboard GPIOs.	2010-10-04 02:59:29 +09:00