cmd/compile/internal/gc: correctly use Float32 in mpgetfltN

This resolves the compiler part of issue golang#10321. Change-Id: I44b9909f992b37dd34b1c5292decd12de3d3a65e Reviewed-on: https://go-review.googlesource.com/10355 Reviewed-by: Alan Donovan <[email protected]>
thorandre · May 22, 2015 · bd7c1f1 · bd7c1f1
1 parent 1c0498f
commit bd7c1f1
Showing 1 changed file with 2 additions and 9 deletions.
diff --git a/src/cmd/compile/internal/gc/mparith3.go b/src/cmd/compile/internal/gc/mparith3.go
@@ -111,15 +111,8 @@ func mpgetfltN(a *Mpflt, prec int, bias int) float64 {
  case 53:
  x, _ = a.Val.Float64()
  case 24:
- // We should be using a.Val.Float32() here but that seems incorrect
- // for certain denormal values (all.bash fails). The current code
- // appears to work for all existing test cases, though there ought
- // to be issues with denormal numbers that are incorrectly rounded.
- // TODO(gri) replace with a.Val.Float32() once correctly working
- // See also: https://github.com/golang/go/issues/10321
- var t Mpflt
- t.Val.SetPrec(24).Set(&a.Val)
- x, _ = t.Val.Float64()
+ x32, _ := a.Val.Float32()
+ x = float64(x32)
  default:
  panic("unreachable")
  }