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#571: fix per M817058

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This commit is contained in:
Cameron Kaiser 2019-08-29 15:05:56 -07:00
parent 78ce567c46
commit 8a9eccaae8
1 changed files with 20 additions and 19 deletions
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39
dom/base/nsTextFragmentVMX.cpp
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@ -17,6 +17,9 @@ FirstNon8Bit(const char16_t *str, const char16_t *end)
{
const uint32_t numUnicharsPerVector = 8;
const uint32_t numCharsPerVector = 16;
// Paranoia. If this assertion is wrong, change the vector loop below.
MOZ_ASSERT((numCharsPerVector / numUnicharsPerVector) == sizeof(char16_t));
register vector unsigned short vect;
typedef Non8BitParameters<sizeof(size_t)> p;
@ -39,27 +42,25 @@ if ((len - alignLen) > (numUnicharsPerVector - 1)) {
register const vector unsigned short gtcompare =
vec_mergel( vec_splat_s8( 0 ), vec_splat_s8( -1 ) );
// Check one VMX register (16 bytes) at a time.
// This is simpler on AltiVec and involves no mucking about with masks,
// since the vec_any_gt intrinsic does exactly what we want.
const int32_t vectWalkEnd = ((len - i) / numUnicharsPerVector) * numUnicharsPerVector;
// We use this a lot, so let's calculate it now.
const int32_t vectFactor = (numCharsPerVector/numUnicharsPerVector);
int32_t i2 = i * vectFactor;
i2 = i * sizeof(char16_t);
while (1) {
#define CheckForASCII \
vect = vec_ld(i2, (unsigned short *)str); \
if (vec_any_gt(vect, gtcompare)) \
return (i2 / vectFactor); \
i2 += numCharsPerVector; \
if (!(i2 < vectWalkEnd)) \
break;
CheckForASCII
CheckForASCII
}
i = i2 / vectFactor;
}
else {
// Check one VMX register (8 unichars) at a time. The vec_any_gt
// intrinsic does exactly what we want. This loop is manually unrolled;
// it yields notable performance improvements this way.
#define CheckForASCII \
vect = vec_ld(i2, reinterpret_cast<const unsigned short*>(str)); \
if (vec_any_gt(vect, gtcompare)) return i; \
i += numUnicharsPerVector; \
if (!(i < vectWalkEnd)) break; \
i2 += numCharsPerVector;
CheckForASCII CheckForASCII
#undef CheckForASCII
}
} else {
// Align ourselves to a word boundary.
alignLen =
std::min(len, int32_t(((-NS_PTR_TO_UINT32(str)) & alignMask) / sizeof(char16_t)));