90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "qemu/host-utils.h"
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#include "exec/helper-proto.h"
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#include "translate.h"
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static uint8_t reverse_bits(uint8_t b)
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{
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b = ((b & 0xf0) >> 4) | ((b & 0x0f) << 4);
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b = ((b & 0xcc) >> 2) | ((b & 0x33) << 2);
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b = ((b & 0xaa) >> 1) | ((b & 0x55) << 1);
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return b;
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}
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typedef union {
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uint64_t n;
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uint8_t s[8];
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} u8x8;
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uint64_t HELPER(packed_shuffle_i64)(uint64_t src1, uint64_t src2, uint64_t src3)
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{
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u8x8 ret, s1, s2, s3;
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unsigned int i;
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s1.n = src1;
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s2.n = src2;
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s3.n = src3;
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for (i = 0; i < 8; i++) {
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uint8_t desc = s3.s[i];
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int index = extract8(desc, 0, 3);
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uint8_t byte;
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if (desc < 0x80) {
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if (desc & 0x08) {
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byte = s1.s[index];
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} else {
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byte = s2.s[index];
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}
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switch(desc >> 5) {
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case 0x1:
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byte = reverse_bits(byte);
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break;
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case 0x2:
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if ((byte & 0x80) != 0) {
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byte = 0xff;
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} else {
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byte = 0;
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}
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break;
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case 0x3:
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if ((byte & 1) != 0) {
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byte = 0xff;
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} else {
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byte = 0;
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}
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break;
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default:
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break;
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}
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if (desc & 0x10) {
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byte = ~byte;
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}
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} else {
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switch(desc >> 6) {
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case 0xa:
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byte = 0x7f;
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break;
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case 0xc:
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byte = 0x80;
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break;
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case 0xe:
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byte = 0xff;
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break;
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default:
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byte = 0;
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break;
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}
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}
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ret.s[i] = byte;
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}
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return ret.n;
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}
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