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Commit 92b59929 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: optimize mtsp(0,sr) inline assembly 



If the value which should be moved into a space register is zero, we can
optimize the inline assembly to become "mtsp %r0,%srX".

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # 3.10
parent 594174d8

arch/parisc/include/asm/special_insns.h

+6 −3
Original line number Diff line number Diff line
@@ -32,9 +32,12 @@ static inline void set_eiem(unsigned long val) 
	cr;				\

})



#define mtsp(gr, cr) \

#define mtsp(val, cr) \

	{ if (__builtin_constant_p(val) && ((val) == 0)) \

	 __asm__ __volatile__("mtsp %%r0,%0" : : "i" (cr) : "memory"); \

	else \

	 __asm__ __volatile__("mtsp %0,%1" \

		: /* no outputs */ \

		: "r" (gr), "i" (cr) : "memory")

		: "r" (val), "i" (cr) : "memory"); }



#endif /* __PARISC_SPECIAL_INSNS_H */