From patchwork Tue Nov 27 00:46:38 2012
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Subject: [libgcc,ARM] __gnu_f2h_internal inaccuracy
Date: Mon, 26 Nov 2012 14:46:38 -0000
From: John Tytgat <John.Tytgat@aaug.net>
X-Patchwork-Id: 202056
Message-Id: <0aa9eef452.Jo@hobbes.bass-software.com>
To: gcc-patches@gcc.gnu.org, ian@airs.com, nickc@redhat.com,
 richard.earnshaw@arm.com, paul@codesourcery.com,
 ramana.radhakrishnan@arm.com

In message <ab11eef452.Jo@hobbes.bass-software.com>
          John Tytgat <john@bass-software.com> wrote:

> [...] Attached patch solves this problem. [...]

This time for real.

John Tytgat.


Index: libgcc/config/arm/fp16.c
===================================================================
--- libgcc/config/arm/fp16.c	(revision 193830)
+++ libgcc/config/arm/fp16.c	(working copy)
@@ -47,11 +47,9 @@
   mantissa |= 0x00800000;
   if (aexp < -14)
     {
-      mask = 0x007fffff;
-      if (aexp < -25)
-	aexp = -26;
-      else if (aexp != -25)
-	mask >>= 24 + aexp;
+      mask = 0x00ffffff;
+      if (aexp >= -25)
+        mask >>= 25 + aexp;
     }
   else
     mask = 0x00001fff;