This patchset replaces the following bitops by builtin/generic ones:
- ffs() / __ffs()
- fls() / __fls() / fls64()
- ffz()
- __ilog2() / __ilog2_u32() / __ilog2_u64()
The current functions are written as inline assembly which prevents
GCC to optimise them in case of constant parameters and obliges GCC
to group the related instructions all together.
With the builtin alternatives, GCC optimises better
Christophe Leroy (4):
powerpc: Discard ffs()/__ffs() function and use builtin functions
instead
powerpc: Use builtin functions for fls()/__fls()/fls64()
powerpc: Replace ffz() by equivalent generic function
powerpc: remove __ilog2()s and use generic ones
arch/powerpc/Kconfig | 8 ----
arch/powerpc/include/asm/bitops.h | 87 ++++-----------------------------------
2 files changed, 7 insertions(+), 88 deletions(-)
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2.12.0
