602bb5197c
The Context.Label method and LABEL global function did not agree. Also breaks the convention I'd like to set that capitalized functions must agree with existing Go assembly syntax. To help avoid a conflict with `avo.Label`, attributes were moved to their own package. Fixes #35
717 B
717 B
fnv1a
FNV-1a in avo.
const (
OffsetBasis = 0xcbf29ce484222325
Prime = 0x100000001b3
)
func main() {
TEXT("Hash64", "func(data []byte) uint64")
Doc("Hash64 computes the FNV-1a hash of data.")
ptr := Load(Param("data").Base(), GP64())
n := Load(Param("data").Len(), GP64())
h := RAX
MOVQ(Imm(OffsetBasis), h)
p := GP64()
MOVQ(Imm(Prime), p)
Label("loop")
CMPQ(n, Imm(0))
JE(LabelRef("done"))
b := GP64()
MOVBQZX(Mem{Base: ptr}, b)
XORQ(b, h)
MULQ(p)
INCQ(ptr)
DECQ(n)
JMP(LabelRef("loop"))
Label("done")
Store(h, ReturnIndex(0))
RET()
Generate()
}