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Fix GH-11514: PHP 8.3 build fails with --enable-mbstring enabled #11516

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Fix GH-11514: PHP 8.3 build fails with --enable-mbstring enabled #11516

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6 changes: 6 additions & 0 deletions ext/mbstring/mbstring.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4981,6 +4981,12 @@ static void init_check_utf8(void)

#if defined(ZEND_INTRIN_AVX2_NATIVE) || defined(ZEND_INTRIN_AVX2_RESOLVER)

/* GCC prior to version 8 does not define all intrinsics. See GH-11514.
* Use a workaround from https://stackoverflow.com/questions/32630458/setting-m256i-to-the-value-of-two-m128i-values */
#if defined(__GNUC__) && !defined(__llvm__) && !defined(__INTEL_COMPILER) && __GNUC__ < 8
# define _mm256_set_m128i(v0, v1) _mm256_insertf128_si256(_mm256_castsi128_si256(v1), (v0), 1)
#endif

/* Take (256-bit) `hi` and `lo` as a 512-bit value, shift down by some
* number of bytes, then take the low 256 bits
* This is used to take some number of trailing bytes from the previous 32-byte
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