Commit ae35eea7 authored by Joseph Myers's avatar Joseph Myers Committed by Paolo Bonzini

target/i386: fix pcmpxstrx substring search

One of the cases of the SSE4.2 pcmpestri / pcmpestrm / pcmpistri /
pcmpistrm instructions does a substring search.  The implementation of
this case in the pcmpxstrx helper is incorrect.  The operation in this
case is a search for a string (argument d to the helper) in another
string (argument s to the helper); if a copy of d at a particular
position would run off the end of s, the resulting output bit should
be 0 whether or not the strings match in the region where they
overlap, but the QEMU implementation was wrongly comparing only up to
the point where s ends and counting it as a match if an initial
segment of d matched a terminal segment of s.  Here, "run off the end
of s" means that some byte of d would overlap some byte outside of s;
thus, if d has zero length, it is considered to match everywhere,
including after the end of s.  This patch fixes the implementation to
correspond with the proper instruction semantics.  This fixes four gcc
test failures in my GCC 6-based testing.
Signed-off-by: 's avatarJoseph Myers <>

Message-Id: <>
Signed-off-by: 's avatarPaolo Bonzini <>
parent 80e19606
......@@ -2040,10 +2040,14 @@ static inline unsigned pcmpxstrx(CPUX86State *env, Reg *d, Reg *s,
case 3:
for (j = valids; j >= 0; j--) {
if (validd == -1) {
res = (2 << upper) - 1;
for (j = valids - validd; j >= 0; j--) {
res <<= 1;
v = 1;
for (i = MIN(valids - j, validd); i >= 0; i--) {
for (i = validd; i >= 0; i--) {
v &= (pcmp_val(s, ctrl, i + j) == pcmp_val(d, ctrl, i));
res |= v;
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment