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Set default rounding mode to FE_NEAREST again. Thanks to Matthias Bentrup for providing some explanations.

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This commit is contained in:
Thilo Schulz 2011-09-27 14:43:20 +00:00
parent ebec84c55d
commit 8a500d71da
6 changed files with 34 additions and 59 deletions
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13
code/asm/ftola.c
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@ -22,6 +22,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#include "qasm-inline.h"
static const unsigned short fpucw = 0x0C7F;
/*
* GNU inline asm ftol conversion functions using SSE or FPU
*/
@ -59,14 +61,18 @@ int qvmftolsse(void)
long qftolx87(float f)
{
long retval;
unsigned short oldcw;
__asm__ volatile
(
"fnstcw %2\n"
"fldcw %3\n"
"flds %1\n"
"fistpl %1\n"
"fldcw %2\n"
"mov %1, %0\n"
: "=r" (retval)
: "m" (f)
: "m" (f), "m" (oldcw), "m" (fpucw)
);
return retval;
@ -75,13 +81,18 @@ long qftolx87(float f)
int qvmftolx87(void)
{
int retval;
unsigned short oldcw;
__asm__ volatile
(
"fnstcw %1\n"
"fldcw %2\n"
"flds (" EDI ", " EBX ", 4)\n"
"fistpl (" EDI ", " EBX ", 4)\n"
"fldcw %2\n"
"mov (" EDI ", " EBX ", 4), %0\n"
: "=r" (retval)
: "m" (oldcw), "m" (fpucw)
);
return retval;