x64: Improve accuracy of x^-k.

2011-02-25 11:46:29 +01:00
parent b90d80d80a
commit d437086c5a
4 changed files with 1791 additions and 1794 deletions
--- a/src/buildvm_x86.dasc
+++ b/src/buildvm_x86.dasc
@@ -3074,14 +3074,12 @@ static void build_subroutines(BuildCtx *ctx, int cmov, int sse)
  |6:
  |  je <5				// x^1 ==> x
  |  jb >7
-  |  push RDa
+  |  neg eax
+  |  call <1
  |  sseconst_1 xmm1, RDa
  |  divsd xmm1, xmm0
-  |  pop RDa
  |  movaps xmm0, xmm1
-  |  neg eax
-  |  cmp eax, 1; je <5			// x^-1 ==> 1/x
-  |  jmp <1				// x^-i ==> (1/x)^i
+  |  ret
  |7:
  |  sseconst_1 xmm0, RDa
  |  ret