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powerpc/64: optimise LOAD_REG_IMMEDIATE_SYM()

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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
This commit is contained in:
Christophe Leroy
2019-08-20 14:34:14 +00:00
committed by Michael Ellerman
parent ba18025fb0
commit d7fb5b18a5
3 changed files with 20 additions and 16 deletions
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12
arch/powerpc/include/asm/ppc_asm.h
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@@ -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)