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https://github.com/edk2-porting/linux-next.git
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f2db633d30
Similar to x86/sparc/powerpc implementations except: 1) we implement an extremely efficient has_zero()/find_zero() sequence with both prep_zero_mask() and create_zero_mask() no-operations. 2) Our output from prep_zero_mask() differs in that only the lowest eight bits are used to represent the zero bytes nevertheless it can be safely ORed with other similar masks from prep_zero_mask() and forms input to create_zero_mask(), the two fundamental properties prep_zero_mask() must satisfy. Tests on EV67 and EV68 CPUs revealed that the generic code is essentially as fast (to within 0.5% of CPU cycles) of the old Alpha specific code for large quadword-aligned strings, despite the 30% extra CPU instructions executed. In contrast, the generic code for unaligned strings is substantially slower (by more than a factor of 3) than the old Alpha specific code. Signed-off-by: Michael Cree <mcree@orcon.net.nz> Acked-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.3 KiB
Makefile
57 lines
1.3 KiB
Makefile
#
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# Makefile for alpha-specific library files..
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#
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asflags-y := $(KBUILD_CFLAGS)
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ccflags-y := -Werror
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# Many of these routines have implementations tuned for ev6.
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# Choose them iff we're targeting ev6 specifically.
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ev6-$(CONFIG_ALPHA_EV6) := ev6-
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# Several make use of the cttz instruction introduced in ev67.
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ev67-$(CONFIG_ALPHA_EV67) := ev67-
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lib-y = __divqu.o __remqu.o __divlu.o __remlu.o \
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udelay.o \
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$(ev6-y)memset.o \
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$(ev6-y)memcpy.o \
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memmove.o \
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checksum.o \
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csum_partial_copy.o \
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$(ev67-y)strlen.o \
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$(ev67-y)strcat.o \
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strcpy.o \
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$(ev67-y)strncat.o \
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strncpy.o \
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$(ev6-y)stxcpy.o \
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$(ev6-y)stxncpy.o \
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$(ev67-y)strchr.o \
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$(ev67-y)strrchr.o \
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$(ev6-y)memchr.o \
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$(ev6-y)copy_user.o \
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$(ev6-y)clear_user.o \
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$(ev6-y)csum_ipv6_magic.o \
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$(ev6-y)clear_page.o \
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$(ev6-y)copy_page.o \
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fpreg.o \
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callback_srm.o srm_puts.o srm_printk.o \
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fls.o
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lib-$(CONFIG_SMP) += dec_and_lock.o
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# The division routines are built from single source, with different defines.
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AFLAGS___divqu.o = -DDIV
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AFLAGS___remqu.o = -DREM
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AFLAGS___divlu.o = -DDIV -DINTSIZE
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AFLAGS___remlu.o = -DREM -DINTSIZE
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$(obj)/__divqu.o: $(obj)/$(ev6-y)divide.S
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$(cmd_as_o_S)
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$(obj)/__remqu.o: $(obj)/$(ev6-y)divide.S
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$(cmd_as_o_S)
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$(obj)/__divlu.o: $(obj)/$(ev6-y)divide.S
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$(cmd_as_o_S)
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$(obj)/__remlu.o: $(obj)/$(ev6-y)divide.S
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$(cmd_as_o_S)
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