Shuffle some instructions around in the __hround macro to shave off
0.1 cycles per byte on Cortex-A57.
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
---
arch/arm64/crypto/aes-cipher-core.S | 52 +++++++-------------
1 file changed, 19 insertions(+), 33 deletions(-)
diff --git a/arch/arm64/crypto/aes-cipher-core.S
b/arch/arm64/crypto/aes-cipher-core.S
index cd58c61e6677..f2f9cc519309 100644
--- a/arch/arm64/crypto/aes-cipher-core.S
+++ b/arch/arm64/crypto/aes-cipher-core.S
@@ -20,46 +20,32 @@
tt .req x4
lt .req x2
- .macro __hround, out0, out1, in0, in1, in2, in3, t0, t1, enc
- ldp \out0, \out1, [rk], #8
-
- ubfx w13, \in0, #0, #8
- ubfx w14, \in1, #8, #8
- ldr w13, [tt, w13, uxtw #2]
- ldr w14, [tt, w14, uxtw #2]
-
+ .macro __pair, enc, reg0, reg1, in0, in1e, in1d, shift
+ ubfx \reg0, \in0, #\shift, #8
.if \enc
- ubfx w17, \in1, #0, #8
- ubfx w18, \in2, #8, #8
+ ubfx \reg1, \in1e, #\shift, #8
.else
- ubfx w17, \in3, #0, #8
- ubfx w18, \in0, #8, #8
+ ubfx \reg1, \in1d, #\shift, #8
.endif
- ldr w17, [tt, w17, uxtw #2]
- ldr w18, [tt, w18, uxtw #2]
+ ldr \reg0, [tt, \reg0, uxtw #2]
+ ldr \reg1, [tt, \reg1, uxtw #2]
+ .endm
- ubfx w15, \in2, #16, #8
- ubfx w16, \in3, #24, #8
- ldr w15, [tt, w15, uxtw #2]
- ldr w16, [tt, w16, uxtw #2]
+ .macro __hround, out0, out1, in0, in1, in2, in3, t0, t1, enc
+ ldp \out0, \out1, [rk], #8
- .if \enc
- ubfx \t0, \in3, #16, #8
- ubfx \t1, \in0, #24, #8
- .else
- ubfx \t0, \in1, #16, #8
- ubfx \t1, \in2, #24, #8
- .endif
- ldr \t0, [tt, \t0, uxtw #2]
- ldr \t1, [tt, \t1, uxtw #2]
+ __pair \enc, w13, w14, \in0, \in1, \in3, 0
+ __pair \enc, w15, w16, \in1, \in2, \in0, 8
+ __pair \enc, w17, w18, \in2, \in3, \in1, 16
+ __pair \enc, \t0, \t1, \in3, \in0, \in2, 24
eor \out0, \out0, w13
- eor \out1, \out1, w17
- eor \out0, \out0, w14, ror #24
- eor \out1, \out1, w18, ror #24
- eor \out0, \out0, w15, ror #16
- eor \out1, \out1, \t0, ror #16
- eor \out0, \out0, w16, ror #8
+ eor \out1, \out1, w14
+ eor \out0, \out0, w15, ror #24
+ eor \out1, \out1, w16, ror #24
+ eor \out0, \out0, w17, ror #16
+ eor \out1, \out1, w18, ror #16
+ eor \out0, \out0, \t0, ror #8
eor \out1, \out1, \t1, ror #8
.endm
--
2.7.4
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