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Improve multiplication on x64.

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Thanks Bob for the spot.
This commit is contained in:
Anatol Belski
2016-12-03 15:44:36 +01:00
parent 143ee76fe4
commit c5af4b2585
3 changed files with 165 additions and 2 deletions
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149
Zend/tests/zend_signed_multiply-64bit-2.phpt Normal file
View File

@@ -0,0 +1,149 @@
--TEST--
Zend signed multiply 64-bit, variation 2
--SKIPIF--
<?php if ((1 << 31) < 0) print "skip Running on 32-bit target"; ?>
--FILE--
<?php
for($c = -16; $c < 0; $c++) {
var_dump($c, intdiv(PHP_INT_MIN, 10), intdiv(PHP_INT_MIN, 10) * $c);
echo "-----------\n";
}
for($c = 0; $c <= 16; $c++) {
var_dump($c, intdiv(PHP_INT_MAX, 10), intdiv(PHP_INT_MAX, 10) * $c);
echo "-----------\n";
}
?>
--EXPECTF--
int(-16)
int(-922337203685477580)
float(1.4757395258968E+19)
-----------
int(-15)
int(-922337203685477580)
float(1.3835058055282E+19)
-----------
int(-14)
int(-922337203685477580)
float(1.2912720851597E+19)
-----------
int(-13)
int(-922337203685477580)
float(1.1990383647911E+19)
-----------
int(-12)
int(-922337203685477580)
float(1.1068046444226E+19)
-----------
int(-11)
int(-922337203685477580)
float(1.014570924054E+19)
-----------
int(-10)
int(-922337203685477580)
int(9223372036854775800)
-----------
int(-9)
int(-922337203685477580)
int(8301034833169298220)
-----------
int(-8)
int(-922337203685477580)
int(7378697629483820640)
-----------
int(-7)
int(-922337203685477580)
int(6456360425798343060)
-----------
int(-6)
int(-922337203685477580)
int(5534023222112865480)
-----------
int(-5)
int(-922337203685477580)
int(4611686018427387900)
-----------
int(-4)
int(-922337203685477580)
int(3689348814741910320)
-----------
int(-3)
int(-922337203685477580)
int(2767011611056432740)
-----------
int(-2)
int(-922337203685477580)
int(1844674407370955160)
-----------
int(-1)
int(-922337203685477580)
int(922337203685477580)
-----------
int(0)
int(922337203685477580)
int(0)
-----------
int(1)
int(922337203685477580)
int(922337203685477580)
-----------
int(2)
int(922337203685477580)
int(1844674407370955160)
-----------
int(3)
int(922337203685477580)
int(2767011611056432740)
-----------
int(4)
int(922337203685477580)
int(3689348814741910320)
-----------
int(5)
int(922337203685477580)
int(4611686018427387900)
-----------
int(6)
int(922337203685477580)
int(5534023222112865480)
-----------
int(7)
int(922337203685477580)
int(6456360425798343060)
-----------
int(8)
int(922337203685477580)
int(7378697629483820640)
-----------
int(9)
int(922337203685477580)
int(8301034833169298220)
-----------
int(10)
int(922337203685477580)
int(9223372036854775800)
-----------
int(11)
int(922337203685477580)
float(1.014570924054E+19)
-----------
int(12)
int(922337203685477580)
float(1.1068046444226E+19)
-----------
int(13)
int(922337203685477580)
float(1.1990383647911E+19)
-----------
int(14)
int(922337203685477580)
float(1.2912720851597E+19)
-----------
int(15)
int(922337203685477580)
float(1.3835058055282E+19)
-----------
int(16)
int(922337203685477580)
float(1.4757395258968E+19)
-----------

2
Zend/tests/zend_signed_multiply-64bit.phpt
View File

@@ -1,5 +1,5 @@
--TEST--
Zend signed multiply 64-bit
Zend signed multiply 64-bit, variation 1
--SKIPIF--
<?php if ((1 << 31) < 0) print "skip Running on 32-bit target"; ?>
--FILE--

16
Zend/zend_multiply.h
View File

@@ -83,7 +83,20 @@
#elif defined(ZEND_WIN32)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
# ifdef _M_X64
# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
__int64 __high; \
__int64 __low = _mul128((a), (b), &__high); \
if ((__low >> 63i64) == __high) { \
(usedval) = 0; \
(lval) = __low; \
} else { \
(usedval) = 1; \
(dval) = (double)(a) * (double)(b); \
} \
} while (0)
# else
# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
zend_long __lres = (a) * (b); \
long double __dres = (long double)(a) * (long double)(b); \
long double __delta = (long double) __lres - __dres; \
@@ -93,6 +106,7 @@
(lval) = __lres; \
} \
} while (0)
# endif
#elif defined(__powerpc64__) && defined(__GNUC__)