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Commit b1a05787 authored by Naveen N. Rao's avatar Naveen N. Rao Committed by Michael Ellerman
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powerpc/bpf/jit: Optimize 64-bit Immediate loads 



Similar to the LI32() optimization, if the value can be represented
in 32-bits, use LI32(). Also handle loading a few specific forms of
immediate values in an optimum manner.

Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent aaf2f7e0

arch/powerpc/net/bpf_jit.h

+11 −6
Original line number Diff line number Diff line
@@ -244,20 +244,25 @@ DECLARE_LOAD_FUNC(sk_load_byte_msh); 
		} } while(0)



#define PPC_LI64(d, i)		do {					      \

		if (!((uintptr_t)(i) & 0xffffffff00000000ULL))		      \

		if ((long)(i) >= -2147483648 &&				      \

				(long)(i) < 2147483648)			      \

			PPC_LI32(d, i);					      \

		else {							      \

			if (!((uintptr_t)(i) & 0xffff800000000000ULL))	      \

				PPC_LI(d, ((uintptr_t)(i) >> 32) & 0xffff);   \

			else {						      \

				PPC_LIS(d, ((uintptr_t)(i) >> 48));	      \

				if ((uintptr_t)(i) & 0x0000ffff00000000ULL)   \

					PPC_ORI(d, d,			      \

					  ((uintptr_t)(i) >> 32) & 0xffff);   \

			}						      \

			PPC_SLDI(d, d, 32);				      \

			if ((uintptr_t)(i) & 0x00000000ffff0000ULL)	      \

				PPC_ORIS(d, d,				      \

					 ((uintptr_t)(i) >> 16) & 0xffff);    \

			if ((uintptr_t)(i) & 0x000000000000ffffULL)	      \

				PPC_ORI(d, d, (uintptr_t)(i) & 0xffff);	      \

		} } while (0);

		} } while (0)



#ifdef CONFIG_PPC64

#define PPC_FUNC_ADDR(d,i) do { PPC_LI64(d, i); } while(0)