* x86-64: fpc_frac_real further improved: memory loads of extendeds are expensive

git-svn-id: trunk@49632 -
2025-08-30 20:40:20 +02:00 · 2021-07-22 21:15:03 +00:00 · 2021-07-22 21:15:03 +00:00 · cebf880df9
commit cebf880df9
parent 0e3d95b589
1 changed files with 4 additions and 4 deletions
--- a/rtl/x86_64/math.inc
+++ b/rtl/x86_64/math.inc
@ -1,3 +1,4 @@
+
 {
    Implementation of mathematical routines for x86_64

@ -292,15 +293,14 @@ const
        oldcw,newcw: word;
      asm
            fnstcw oldcw
+            fldt d
            movw oldcw,%cx
            orw $0x0c3f,%cx
            movw %cx,newcw
            fldcw newcw
-            fldt d
+            fld %st
            frndint
-            fldt d
-            fsub %st(1),%st
-            fstp %st(1)
+            fsubrp %st,%st(1)
            fldcw oldcw
            fwait
      end;