/openbmc/linux/arch/powerpc/net/ |
H A D | bpf_jit_comp32.c | 40272035 Mon Mar 22 11:37:53 CDT 2021 Christophe Leroy <christophe.leroy@csgroup.eu> powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32
When the BPF routine doesn't call any function, the non volatile registers can be reallocated to volatile registers in order to avoid having to save them/restore on the stack.
Before this patch, the test #359 ADD default X is:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 92 e1 00 2c stw r23,44(r1) 14: 93 01 00 30 stw r24,48(r1) 18: 93 21 00 34 stw r25,52(r1) 1c: 93 41 00 38 stw r26,56(r1) 20: 39 80 00 00 li r12,0 24: 39 60 00 00 li r11,0 28: 3b 40 00 00 li r26,0 2c: 3b 20 00 00 li r25,0 30: 7c 98 23 78 mr r24,r4 34: 7c 77 1b 78 mr r23,r3 38: 39 80 00 42 li r12,66 3c: 39 60 00 00 li r11,0 40: 7d 8c d2 14 add r12,r12,r26 44: 39 60 00 00 li r11,0 48: 7d 83 63 78 mr r3,r12 4c: 82 e1 00 2c lwz r23,44(r1) 50: 83 01 00 30 lwz r24,48(r1) 54: 83 21 00 34 lwz r25,52(r1) 58: 83 41 00 38 lwz r26,56(r1) 5c: 38 21 00 50 addi r1,r1,80 60: 4e 80 00 20 blr
After this patch, the same test has become:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 39 80 00 00 li r12,0 14: 39 60 00 00 li r11,0 18: 39 00 00 00 li r8,0 1c: 38 e0 00 00 li r7,0 20: 7c 86 23 78 mr r6,r4 24: 7c 65 1b 78 mr r5,r3 28: 39 80 00 42 li r12,66 2c: 39 60 00 00 li r11,0 30: 7d 8c 42 14 add r12,r12,r8 34: 39 60 00 00 li r11,0 38: 7d 83 63 78 mr r3,r12 3c: 38 21 00 50 addi r1,r1,80 40: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b94562d7d2bb21aec89de0c40bb3cd91054b65a2.1616430991.git.christophe.leroy@csgroup.eu
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H A D | bpf_jit.h | 40272035 Mon Mar 22 11:37:53 CDT 2021 Christophe Leroy <christophe.leroy@csgroup.eu> powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32
When the BPF routine doesn't call any function, the non volatile registers can be reallocated to volatile registers in order to avoid having to save them/restore on the stack.
Before this patch, the test #359 ADD default X is:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 92 e1 00 2c stw r23,44(r1) 14: 93 01 00 30 stw r24,48(r1) 18: 93 21 00 34 stw r25,52(r1) 1c: 93 41 00 38 stw r26,56(r1) 20: 39 80 00 00 li r12,0 24: 39 60 00 00 li r11,0 28: 3b 40 00 00 li r26,0 2c: 3b 20 00 00 li r25,0 30: 7c 98 23 78 mr r24,r4 34: 7c 77 1b 78 mr r23,r3 38: 39 80 00 42 li r12,66 3c: 39 60 00 00 li r11,0 40: 7d 8c d2 14 add r12,r12,r26 44: 39 60 00 00 li r11,0 48: 7d 83 63 78 mr r3,r12 4c: 82 e1 00 2c lwz r23,44(r1) 50: 83 01 00 30 lwz r24,48(r1) 54: 83 21 00 34 lwz r25,52(r1) 58: 83 41 00 38 lwz r26,56(r1) 5c: 38 21 00 50 addi r1,r1,80 60: 4e 80 00 20 blr
After this patch, the same test has become:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 39 80 00 00 li r12,0 14: 39 60 00 00 li r11,0 18: 39 00 00 00 li r8,0 1c: 38 e0 00 00 li r7,0 20: 7c 86 23 78 mr r6,r4 24: 7c 65 1b 78 mr r5,r3 28: 39 80 00 42 li r12,66 2c: 39 60 00 00 li r11,0 30: 7d 8c 42 14 add r12,r12,r8 34: 39 60 00 00 li r11,0 38: 7d 83 63 78 mr r3,r12 3c: 38 21 00 50 addi r1,r1,80 40: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b94562d7d2bb21aec89de0c40bb3cd91054b65a2.1616430991.git.christophe.leroy@csgroup.eu
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H A D | bpf_jit_comp.c | 40272035 Mon Mar 22 11:37:53 CDT 2021 Christophe Leroy <christophe.leroy@csgroup.eu> powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32
When the BPF routine doesn't call any function, the non volatile registers can be reallocated to volatile registers in order to avoid having to save them/restore on the stack.
Before this patch, the test #359 ADD default X is:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 92 e1 00 2c stw r23,44(r1) 14: 93 01 00 30 stw r24,48(r1) 18: 93 21 00 34 stw r25,52(r1) 1c: 93 41 00 38 stw r26,56(r1) 20: 39 80 00 00 li r12,0 24: 39 60 00 00 li r11,0 28: 3b 40 00 00 li r26,0 2c: 3b 20 00 00 li r25,0 30: 7c 98 23 78 mr r24,r4 34: 7c 77 1b 78 mr r23,r3 38: 39 80 00 42 li r12,66 3c: 39 60 00 00 li r11,0 40: 7d 8c d2 14 add r12,r12,r26 44: 39 60 00 00 li r11,0 48: 7d 83 63 78 mr r3,r12 4c: 82 e1 00 2c lwz r23,44(r1) 50: 83 01 00 30 lwz r24,48(r1) 54: 83 21 00 34 lwz r25,52(r1) 58: 83 41 00 38 lwz r26,56(r1) 5c: 38 21 00 50 addi r1,r1,80 60: 4e 80 00 20 blr
After this patch, the same test has become:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 39 80 00 00 li r12,0 14: 39 60 00 00 li r11,0 18: 39 00 00 00 li r8,0 1c: 38 e0 00 00 li r7,0 20: 7c 86 23 78 mr r6,r4 24: 7c 65 1b 78 mr r5,r3 28: 39 80 00 42 li r12,66 2c: 39 60 00 00 li r11,0 30: 7d 8c 42 14 add r12,r12,r8 34: 39 60 00 00 li r11,0 38: 7d 83 63 78 mr r3,r12 3c: 38 21 00 50 addi r1,r1,80 40: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b94562d7d2bb21aec89de0c40bb3cd91054b65a2.1616430991.git.christophe.leroy@csgroup.eu
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H A D | bpf_jit_comp64.c | 40272035 Mon Mar 22 11:37:53 CDT 2021 Christophe Leroy <christophe.leroy@csgroup.eu> powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32
When the BPF routine doesn't call any function, the non volatile registers can be reallocated to volatile registers in order to avoid having to save them/restore on the stack.
Before this patch, the test #359 ADD default X is:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 92 e1 00 2c stw r23,44(r1) 14: 93 01 00 30 stw r24,48(r1) 18: 93 21 00 34 stw r25,52(r1) 1c: 93 41 00 38 stw r26,56(r1) 20: 39 80 00 00 li r12,0 24: 39 60 00 00 li r11,0 28: 3b 40 00 00 li r26,0 2c: 3b 20 00 00 li r25,0 30: 7c 98 23 78 mr r24,r4 34: 7c 77 1b 78 mr r23,r3 38: 39 80 00 42 li r12,66 3c: 39 60 00 00 li r11,0 40: 7d 8c d2 14 add r12,r12,r26 44: 39 60 00 00 li r11,0 48: 7d 83 63 78 mr r3,r12 4c: 82 e1 00 2c lwz r23,44(r1) 50: 83 01 00 30 lwz r24,48(r1) 54: 83 21 00 34 lwz r25,52(r1) 58: 83 41 00 38 lwz r26,56(r1) 5c: 38 21 00 50 addi r1,r1,80 60: 4e 80 00 20 blr
After this patch, the same test has become:
0: 7c 64 1b 78 mr r4,r3 4: 38 60 00 00 li r3,0 8: 94 21 ff b0 stwu r1,-80(r1) c: 60 00 00 00 nop 10: 39 80 00 00 li r12,0 14: 39 60 00 00 li r11,0 18: 39 00 00 00 li r8,0 1c: 38 e0 00 00 li r7,0 20: 7c 86 23 78 mr r6,r4 24: 7c 65 1b 78 mr r5,r3 28: 39 80 00 42 li r12,66 2c: 39 60 00 00 li r11,0 30: 7d 8c 42 14 add r12,r12,r8 34: 39 60 00 00 li r11,0 38: 7d 83 63 78 mr r3,r12 3c: 38 21 00 50 addi r1,r1,80 40: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b94562d7d2bb21aec89de0c40bb3cd91054b65a2.1616430991.git.christophe.leroy@csgroup.eu
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