github-wownero/RandomX
1
0
Fork 0
mirror of https://github.com/wownero/RandomX.git synced 2026-10-18 16:01:40 +02:00
Code Issues Packages Projects Releases Wiki Activity

Fixed x87 math precision (i386 build)

Browse Source
This commit is contained in:
tevador
2019-05-15 16:30:20 +02:00
parent 177d2e7c98
commit 2a04dfdd4f
2 changed files with 38 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/instructions_portable.cpp
+23 -3
View File
@@ -127,9 +127,7 @@ along with RandomX. If not, see<http://www.gnu.org/licenses/>.
void rx_reset_float_state() {
setRoundMode_(FE_TONEAREST);
#ifdef RANDOMX_USE_X87
_control87(_PC_53, _MCW_PC); //set x87 precision to 53 bits
#endif
rx_set_double_precision(); //set precision to 53 bits if needed by the platform
}
void rx_set_rounding_mode(uint32_t mode) {
@@ -153,6 +151,28 @@ void rx_set_rounding_mode(uint32_t mode) {
#endif
#ifdef RANDOMX_USE_X87
#ifdef _M_IX86
void rx_set_double_precision() {
_control87(_PC_53, _MCW_PC);
}
#elif defined(__i386)
void rx_set_double_precision() {
uint16_t volatile x87cw;
asm volatile("fstcw %0" : "=m" (x87cw));
x87cw &= ~0x300;
x87cw |= 0x200;
asm volatile("fldcw %0" : : "m" (x87cw));
}
#endif
#endif //RANDOMX_USE_X87
union double_ser_t {
double f;
uint64_t i;