| From 92b59929825d67db575043a76651865d16873b36 Mon Sep 17 00:00:00 2001 |
| From: Helge Deller <deller@gmx.de> |
| Date: Sat, 29 Jun 2013 22:08:03 +0200 |
| Subject: parisc: optimize mtsp(0,sr) inline assembly |
| |
| From: Helge Deller <deller@gmx.de> |
| |
| 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> |
| |
| --- |
| arch/parisc/include/asm/special_insns.h | 9 ++++++--- |
| 1 file changed, 6 insertions(+), 3 deletions(-) |
| |
| --- a/arch/parisc/include/asm/special_insns.h |
| +++ b/arch/parisc/include/asm/special_insns.h |
| @@ -32,9 +32,12 @@ static inline void set_eiem(unsigned lon |
| cr; \ |
| }) |
| |
| -#define mtsp(gr, cr) \ |
| - __asm__ __volatile__("mtsp %0,%1" \ |
| +#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 */ |
