mips fesetround does not write back the rounding mode to FCSR


diff --git a/src/fenv/mips/fenv.s b/src/fenv/mips/fenv.s
index 9b45ffc..f60b0e7 100644
--- a/src/fenv/mips/fenv.s
+++ b/src/fenv/mips/fenv.s
@@ -43,6 +43,7 @@ __fesetround:
        li      $6, -4
        and     $5, $5, $6
        or      $5, $5, $4
+       ctc1    $5, $31
        jr      $ra
        li      $2, 0