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| author | Helge Deller <deller@gmx.de> | 2013-06-29 22:08:03 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-21 18:21:26 -0700 |
| commit | a2ebe4443fd55755cae5834e3f3021d3572cc463 (patch) | |
| tree | 1eef36eb34dbe5211c8d14aab963c0a1589668d2 /arch/parisc | |
| parent | 286f3bf473da48489bb539c08088fbb8dc64a35c (diff) | |
| download | linux-3.10-a2ebe4443fd55755cae5834e3f3021d3572cc463.tar.gz linux-3.10-a2ebe4443fd55755cae5834e3f3021d3572cc463.tar.bz2 linux-3.10-a2ebe4443fd55755cae5834e3f3021d3572cc463.zip | |
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>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/include/asm/special_insns.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/special_insns.h b/arch/parisc/include/asm/special_insns.h index d306b75bc77..e1509308899 100644 --- 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 long val) 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 */ |