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PowerPC64 support in long multiplication

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In long integer multiplications, avoid casting
both operands to long double and use an inline
assembly-based overflow checking function instead.
This commit is contained in:
Gustavo Frederico Temple Pedrosa 2014-11-25 15:41:15 +00:00 committed by Remi Collet
parent d04685732e
commit 87e0802a99
1 changed files with 18 additions and 0 deletions
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18
Zend/zend_multiply.h
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@ -84,6 +84,24 @@
} \
} while (0)
#elif defined(__powerpc64__) && defined(__GNUC__)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
long __tmpvar; \
__asm__("li 14, 0\n\t" \
"mtxer 14\n\t" \
"mulldo. %0, %2,%3\n\t" \
"xor %1, %1, %1\n\t" \
"bns+ 0f\n\t" \
"li %1, 1\n\t" \
"0:\n" \
: "=r"(__tmpvar),"=r"(usedval) \
: "r"(a), "r"(b) \
: "r14", "cc"); \
if (usedval) (dval) = (double) (a) * (double) (b); \
else (lval) = __tmpvar; \
} while (0)
#elif SIZEOF_ZEND_LONG == 4
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \