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package asm
import (
"encoding/binary"
. "github.com/mmcloughlin/avo/build"
"github.com/mmcloughlin/avo/operand"
)
func ConstBytes(name string, data []byte) operand.Mem {
m := GLOBL(name, RODATA|NOPTR)
switch {
case len(data)%8 == 0:
constBytes8(0, data)
case len(data)%4 == 0:
constBytes4(0, data)
default:
i := (len(data) / 8) * 8
constBytes8(0, data[:i])
constBytes1(i, data[i:])
}
return m
}
func ConstArray16(name string, elems ...uint16) operand.Mem {
data := make([]byte, 2*len(elems))
for i, elem := range elems {
binary.LittleEndian.PutUint16(data[i*2:], elem)
}
return ConstBytes(name, data)
}
func ConstArray32(name string, elems ...uint32) operand.Mem {
data := make([]byte, 4*len(elems))
for i, elem := range elems {
binary.LittleEndian.PutUint32(data[i*4:], elem)
}
return ConstBytes(name, data)
}
func ConstArray64(name string, elems ...uint64) operand.Mem {
data := make([]byte, 8*len(elems))
for i, elem := range elems {
binary.LittleEndian.PutUint64(data[i*8:], elem)
}
return ConstBytes(name, data)
}
func ConstShuffleMask32(name string, indices ...uint32) operand.Mem {
data := make([]byte, 4*len(indices))
for i, index := range indices {
for j := 0; j < 4; j++ {
data[i*4+j] = byte(index*4 + uint32(j))
}
}
return ConstBytes(name, data)
}
func ConstShuffleMask64(name string, indices ...uint64) operand.Mem {
data := make([]byte, 8*len(indices))
for i, index := range indices {
for j := 0; j < 8; j++ {
data[i*8+j] = byte(index*8 + uint64(j))
}
}
return ConstBytes(name, data)
}
func ConstLoadMask32(name string, indices ...uint32) operand.Mem {
data := make([]uint32, len(indices))
for i, index := range indices {
data[i] = index << 31
}
return ConstArray32(name, data...)
}
func ConstLoadMask64(name string, indices ...uint64) operand.Mem {
data := make([]uint64, len(indices))
for i, index := range indices {
data[i] = index << 63
}
return ConstArray64(name, data...)
}
func constBytes8(offset int, data []byte) {
for i := 0; i < len(data); i += 8 {
DATA(offset+i, operand.U64(binary.LittleEndian.Uint64(data[i:i+8])))
}
}
func constBytes4(offset int, data []byte) {
for i := 0; i < len(data); i += 4 {
DATA(offset+i, operand.U32(binary.LittleEndian.Uint32(data[i:i+4])))
}
}
func constBytes1(offset int, data []byte) {
for i, b := range data {
DATA(offset+i, operand.U8(b))
}
}
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