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PowerPC64 support in safe_address function #919

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PowerPC64 support in safe_address function #919

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24 changes: 24 additions & 0 deletions Zend/zend_multiply.h
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,30 @@ static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, si
return res;
}

#elif defined(__GNUC__) && defined(__powerpc64__)

static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
{
size_t res;
unsigned long m_overflow;

__asm__ ("mulld %0,%2,%3\n\t"
"mulhdu %1,%2,%3\n\t"
"addc %0,%0,%4\n\t"
"addze %1,%1\n"
: "=&r"(res), "=&r"(m_overflow)
: "r"(nmemb),
"r"(size),
"r"(offset));

if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}

#elif SIZEOF_SIZE_T == 4

static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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