linux-kernel - [PATCH] alpha: fix conversion from denormal float to double

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Message-ID: <20080116091138.GA17506@jurassic.park.msu.ru>
Date:	Wed, 16 Jan 2008 12:11:38 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Richard Henderson <rth@...ddle.net>, linux-kernel@...r.kernel.org
Subject: [PATCH] alpha: fix conversion from denormal float to double

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

Thanks to Paolo Bonzini <bonzini@....org> for the bug report
and the testcase.

Signed-off-by: Ivan Kokshaysky <ink@...assic.park.msu.ru>
---
 arch/alpha/math-emu/math.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/alpha/math-emu/math.c b/arch/alpha/math-emu/math.c
index ae79dd9..58c2669 100644
--- 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;
 			}
--
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