parisc: optimize mtsp(0,sr) inline assembly
commit 92b59929825d67db575043a76651865d16873b36 upstream. 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: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -32,9 +32,12 @@ static inline void set_eiem(unsigned long val)
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cr; \
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})
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#define mtsp(gr, cr) \
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__asm__ __volatile__("mtsp %0,%1" \
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#define mtsp(val, cr) \
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{ if (__builtin_constant_p(val) && ((val) == 0)) \
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__asm__ __volatile__("mtsp %%r0,%0" : : "i" (cr) : "memory"); \
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else \
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__asm__ __volatile__("mtsp %0,%1" \
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: /* no outputs */ \
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: "r" (gr), "i" (cr) : "memory")
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: "r" (val), "i" (cr) : "memory"); }
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#endif /* __PARISC_SPECIAL_INSNS_H */
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