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x86_64 assembler optimization (Brain Shire)

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This commit is contained in:
Dmitry Stogov 2007-12-20 12:58:46 +00:00
parent d0bfef7f94
commit 1e5e110844
1 changed files with 35 additions and 5 deletions
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36
Zend/zend_alloc.c
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@ -661,6 +661,11 @@ static inline unsigned int zend_mm_high_bit(size_t _size)
__asm__("bsrl %1,%0\n\t" : "=r" (n) : "rm" (_size));
return n;
#elif defined(__GNUC__) && defined(__x86_64__)
unsigned long n;
__asm__("bsrq %1,%0\n\t" : "=r" (n) : "rm" (_size));
return (unsigned int)n;
#elif defined(_MSC_VER) && defined(_M_IX86)
__asm {
bsr eax, _size
@ -682,6 +687,11 @@ static inline unsigned int zend_mm_low_bit(size_t _size)
__asm__("bsfl %1,%0\n\t" : "=r" (n) : "rm" (_size));
return n;
#elif defined(__GNUC__) && defined(__x86_64__)
unsigned long n;
__asm__("bsfq %1,%0\n\t" : "=r" (n) : "rm" (_size));
return (unsigned int)n;
#elif defined(_MSC_VER) && defined(_M_IX86)
__asm {
bsf eax, _size
@ -2301,10 +2311,30 @@ ZEND_API size_t _zend_mem_block_size(void *ptr TSRMLS_DC ZEND_FILE_LINE_DC ZEND_
static inline size_t safe_address(size_t nmemb, size_t size, size_t offset)
{
size_t res = nmemb;
unsigned long overflow ;
unsigned long overflow = 0;
__asm__ ("mull %3\n\taddl %4,%0\n\tadcl $0,%1"
: "=a"(res), "=d" (overflow)
__asm__ ("mull %3\n\taddl %4,%0\n\tadcl %1,%1"
: "=&a"(res), "=&d" (overflow)
: "%0"(res),
"rm"(size),
"rm"(offset));
if (UNEXPECTED(overflow)) {
zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu * %zu + %zu)", nmemb, size, offset);
return 0;
}
return res;
}
#elif defined(__GNUC__) && defined(__x86_64__)
static inline size_t safe_address(size_t nmemb, size_t size, size_t offset)
{
size_t res = nmemb;
unsigned long overflow = 0;
__asm__ ("mulq %3\n\taddq %4,%0\n\tadcq %1,%1"
: "=&a"(res), "=&d" (overflow)
: "%0"(res),
"rm"(size),
"rm"(offset));