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| author | John David Anglin <dave.anglin@bell.net> | 2012-04-01 20:57:18 +0400 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2013-01-08 02:06:22 +0400 |
| commit | cabd91c3bb74a5bc43c3192126af752891d11d77 (patch) | |
| tree | 96be8d73cfe3a5228ecfee947d5dc6b2498503e8 /arch/parisc/math-emu/fcnvxf.c | |
| parent | d287b8750e47c1702dab0e37ac11012bb751ece0 (diff) | |
| download | linux-cabd91c3bb74a5bc43c3192126af752891d11d77.tar.xz | |
parisc: avoid undefined shift in cnv_float.h
The attached change fixes a float conversion problem found running the
GCC testsuite with GCC configured with --with-arch=2.0.
The actual problem occurs for an exponent value of 63. This is the
maximum exponent value that can be passed. This causes a left shift by
32 in the else hunk of the macro. This causes undefined behavior and the
wrong value is returned for dresultB. The fix is the check "exponent <=
62". If the exponent is 63, dresultB is set to 0. The patch also
optimizes the operation a bit by copying "Sall(sgl_value) <<
SGL_EXP_LENGTH" to val, so that sgl_value is not modified.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/math-emu/fcnvxf.c')
0 files changed, 0 insertions, 0 deletions