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hash_amd64.s
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// +build amd64,!appengine,!gccgo
// This is a translation of the gcc output of FloodyBerry's pure-C public
// domain siphash implementation at https://github.com/floodyberry/siphash
// func Hash(k0, k1 uint64, b []byte) uint64
TEXT ·Hash(SB),4,$0-48
MOVQ k0+0(FP),CX
MOVQ $0x736F6D6570736575,R9
MOVQ k1+8(FP),DI
MOVQ $0x6C7967656E657261,BX
MOVQ $0x646F72616E646F6D,AX
MOVQ b_len+24(FP),DX
MOVQ DX,R11
MOVQ DX,R10
XORQ CX,R9
XORQ CX,BX
MOVQ $0x7465646279746573,CX
XORQ DI,AX
XORQ DI,CX
SHLQ $0x38,R11
XORQ DI,DI
MOVQ b_base+16(FP),SI
ANDQ $0xFFFFFFFFFFFFFFF8,R10
JE afterLoop
XCHGQ AX,AX
loopBody:
MOVQ 0(SI)(DI*1),R8
ADDQ AX,R9
RORQ $0x33,AX
XORQ R9,AX
RORQ $0x20,R9
ADDQ $0x8,DI
XORQ R8,CX
ADDQ CX,BX
RORQ $0x30,CX
XORQ BX,CX
ADDQ AX,BX
RORQ $0x2F,AX
ADDQ CX,R9
RORQ $0x2B,CX
XORQ BX,AX
XORQ R9,CX
RORQ $0x20,BX
ADDQ AX,R9
ADDQ CX,BX
RORQ $0x33,AX
RORQ $0x30,CX
XORQ R9,AX
XORQ BX,CX
RORQ $0x20,R9
ADDQ AX,BX
ADDQ CX,R9
RORQ $0x2F,AX
RORQ $0x2B,CX
XORQ BX,AX
RORQ $0x20,BX
XORQ R9,CX
XORQ R8,R9
CMPQ R10,DI
JA loopBody
afterLoop:
SUBQ R10,DX
CMPQ DX,$0x7
JA afterSwitch
// no support for jump tables
CMPQ DX,$0x7
JE sw7
CMPQ DX,$0x6
JE sw6
CMPQ DX,$0x5
JE sw5
CMPQ DX,$0x4
JE sw4
CMPQ DX,$0x3
JE sw3
CMPQ DX,$0x2
JE sw2
CMPQ DX,$0x1
JE sw1
JMP afterSwitch
sw7: MOVBQZX 6(SI)(DI*1),DX
SHLQ $0x30,DX
ORQ DX,R11
sw6: MOVBQZX 0x5(SI)(DI*1),DX
SHLQ $0x28,DX
ORQ DX,R11
sw5: MOVBQZX 0x4(SI)(DI*1),DX
SHLQ $0x20,DX
ORQ DX,R11
sw4: MOVBQZX 0x3(SI)(DI*1),DX
SHLQ $0x18,DX
ORQ DX,R11
sw3: MOVBQZX 0x2(SI)(DI*1),DX
SHLQ $0x10,DX
ORQ DX,R11
sw2: MOVBQZX 0x1(SI)(DI*1),DX
SHLQ $0x8,DX
ORQ DX,R11
sw1: MOVBQZX 0(SI)(DI*1),DX
ORQ DX,R11
afterSwitch:
LEAQ (AX)(R9*1),SI
XORQ R11,CX
RORQ $0x33,AX
ADDQ CX,BX
MOVQ CX,DX
XORQ SI,AX
RORQ $0x30,DX
RORQ $0x20,SI
LEAQ 0(BX)(AX*1),CX
XORQ BX,DX
RORQ $0x2F,AX
ADDQ DX,SI
RORQ $0x2B,DX
XORQ CX,AX
XORQ SI,DX
RORQ $0x20,CX
ADDQ AX,SI
RORQ $0x33,AX
ADDQ DX,CX
XORQ SI,AX
RORQ $0x30,DX
RORQ $0x20,SI
XORQ CX,DX
ADDQ AX,CX
RORQ $0x2F,AX
ADDQ DX,SI
XORQ CX,AX
RORQ $0x2B,DX
RORQ $0x20,CX
XORQ SI,DX
XORQ R11,SI
XORB $0xFF,CL
ADDQ AX,SI
RORQ $0x33,AX
ADDQ DX,CX
RORQ $0x30,DX
XORQ SI,AX
XORQ CX,DX
RORQ $0x20,SI
ADDQ AX,CX
ADDQ DX,SI
RORQ $0x2F,AX
RORQ $0x2B,DX
XORQ CX,AX
XORQ SI,DX
RORQ $0x20,CX
ADDQ AX,SI
ADDQ DX,CX
RORQ $0x33,AX
RORQ $0x30,DX
XORQ SI,AX
RORQ $0x20,SI
XORQ CX,DX
ADDQ AX,CX
RORQ $0x2F,AX
ADDQ DX,SI
RORQ $0x2B,DX
XORQ CX,AX
XORQ SI,DX
RORQ $0x20,CX
ADDQ AX,SI
ADDQ DX,CX
RORQ $0x33,AX
RORQ $0x30,DX
XORQ CX,DX
XORQ SI,AX
RORQ $0x20,SI
ADDQ DX,SI
ADDQ AX,CX
RORQ $0x2F,AX
XORQ CX,AX
RORQ $0x2B,DX
RORQ $0x20,CX
XORQ SI,DX
ADDQ AX,SI
RORQ $0x33,AX
ADDQ DX,CX
XORQ SI,AX
RORQ $0x30,DX
XORQ CX,DX
ADDQ AX,CX
RORQ $0x2F,AX
XORQ CX,AX
RORQ $0x2B,DX
RORQ $0x20,CX
XORQ DX,AX
XORQ CX,AX
MOVQ AX,ret+40(FP)
RET