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decode simplification for AMD XOP prefix

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This commit is contained in:
Stanislav Shwartsman 2013-08-28 19:56:19 +00:00
parent 5d61c19b0b
commit 7e2ab5ca81
2 changed files with 9 additions and 30 deletions
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16
bochs/cpu/fetchdecode.cc
View File

@ -1411,11 +1411,12 @@ fetch_b1:
else if (b1 == 0x8f && (*iptr & 0xc8) == 0xc8) {
// 3 byte XOP prefix
had_xop = 1;
if (sse_prefix) had_xop = -1;
if (! protected_mode()) had_xop = -1;
unsigned vex;
if (remain != 0) {
remain--;
if (remain > 2) {
remain -= 3;
vex = *iptr++; // fetch XOP2
}
else
@ -1425,12 +1426,7 @@ fetch_b1:
if (xop_opcext >= 3)
had_xop = -1;
if (remain != 0) {
remain--;
vex = *iptr++; // fetch XOP3
}
else
return(-1);
vex_w = (vex >> 7) & 0x1;
vvv = 15 - ((vex >> 3) & 0xf);
@ -1439,13 +1435,7 @@ fetch_b1:
sse_prefix = vex & 0x3;
if (sse_prefix) had_xop = -1;
if (remain != 0) {
remain--;
b1 = *iptr++; // fetch new b1
}
else
return(-1);
has_modrm = 1;
b1 += 256 * xop_opcext;
}

15
bochs/cpu/fetchdecode64.cc
View File

@ -1880,8 +1880,8 @@ fetch_b1:
if (! protected_mode()) had_xop = -1;
unsigned vex;
if (remain != 0) {
remain--;
if (remain > 2) {
remain -= 3;
vex = *iptr++; // fetch XOP2
}
else
@ -1895,12 +1895,7 @@ fetch_b1:
if (xop_opcext >= 3)
had_xop = -1;
if (remain != 0) {
remain--;
vex = *iptr++; // fetch XOP3
}
else
return(-1);
if (vex & 0x80) {
vex_w = 1;
@ -1914,13 +1909,7 @@ fetch_b1:
sse_prefix = vex & 0x3;
if (sse_prefix) had_xop = -1;
if (remain != 0) {
remain--;
b1 = *iptr++; // fetch new b1
}
else
return(-1);
has_modrm = 1;
b1 += 256 * xop_opcext;
}