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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-08-20 14:34:14 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-27 13:03:36 +1000 |
| commit | d7fb5b18a540efaf05da2b980fc11d50ba775677 (patch) | |
| tree | 6e88bfda47b1df1f090386a691b3c5f4540b378c /arch/powerpc/include/asm/ppc_asm.h | |
| parent | powerpc/32: replace LOAD_MSR_KERNEL() by LOAD_REG_IMMEDIATE() (diff) | |
| download | linux-dev-d7fb5b18a540efaf05da2b980fc11d50ba775677.tar.xz linux-dev-d7fb5b18a540efaf05da2b980fc11d50ba775677.zip | |
powerpc/64: optimise LOAD_REG_IMMEDIATE_SYM()
Optimise LOAD_REG_IMMEDIATE_SYM() using a temporary register to
parallelise operations.
It reduces the path from 5 to 3 instructions.
Suggested-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bad41ed02531bb0382420cbab50a0d7153b71767.1566311636.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm/ppc_asm.h')
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 20a00209c965..dd3b191bdcea 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -347,12 +347,12 @@ n: #define LOAD_REG_IMMEDIATE(reg, expr) __LOAD_REG_IMMEDIATE reg, expr -#define LOAD_REG_IMMEDIATE_SYM(reg,expr) \ - lis reg,(expr)@highest; \ - ori reg,reg,(expr)@higher; \ - rldicr reg,reg,32,31; \ - oris reg,reg,(expr)@__AS_ATHIGH; \ - ori reg,reg,(expr)@l; +#define LOAD_REG_IMMEDIATE_SYM(reg, tmp, expr) \ + lis tmp, (expr)@highest; \ + lis reg, (expr)@__AS_ATHIGH; \ + ori tmp, tmp, (expr)@higher; \ + ori reg, reg, (expr)@l; \ + rldimi reg, tmp, 32, 0 #define LOAD_REG_ADDR(reg,name) \ ld reg,name@got(r2) |