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ircd::utf16: Fix masking of unused lane result values.

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This commit is contained in:
Jason Volk 2020-09-03 21:40:47 -07:00
parent 0d586d6d0c
commit c92127a8cd
1 changed files with 12 additions and 8 deletions
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20
ircd/utf.cc
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@ -137,6 +137,12 @@ noexcept
(codepoint_paired <= 0xffffU) & ~(shl<32>(codepoint_high))
};
// When one surrogate is input, only lane[0]
const u32x4 ret_codepoint_single
{
codepoint_unpaired & ~surrogate_pair_range & ~surrogate_deuce
};
// When two surrogates in a pair are input, lane[0] only
const u32x4 ret_codepoint_paired
{
@ -149,16 +155,14 @@ noexcept
codepoint_unpaired & ~surrogate_pair_range & surrogate_deuce
};
// When one surrogate is input, only lane[0]
const u32x4 ret_codepoint_single
{
codepoint_unpaired & ~surrogate_pair_range & ~surrogate_deuce
};
static const u32x4
mask_one { -1U, 0U, 0U, 0U, },
mask_two { -1U, -1U, 0U, 0U, };
return 0
| ret_codepoint_paired
| ret_codepoint_unpaired
| ret_codepoint_single
| (ret_codepoint_single & mask_one)
| (ret_codepoint_paired & mask_one)
| (ret_codepoint_unpaired & mask_two)
;
}