alpha: fix conversion from denormal float to double

The trap handler does properly update the fraction,
but not the exponent...

Thanks to Paolo Bonzini for the bug report and the testcase.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Paolo Bonzini <bonzini@gnu.org>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/math-emu/math.c b/arch/alpha/math-emu/math.c
index ae79dd970b021ff84ca59d3b5f6b14a4b19ce25f..58c2669a1dd4fa431f32ecbe8416c24a540525ba 100644 (file)
--- a/arch/alpha/math-emu/math.c
+++ b/arch/alpha/math-emu/math.c
@@ -225,7 +225,7 @@ alpha_fp_emul (unsigned long pc)
                                FP_UNPACK_SP(SB, &vb);
                                DR_c = DB_c;
                                DR_s = DB_s;
-                               DR_e = DB_e;
+                               DR_e = DB_e + (1024 - 128);
                                DR_f = SB_f << (52 - 23);
                                goto pack_d;
                        }