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fpu/softfloat: Specialize on snan_bit_is_one

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Only MIPS requires snan_bit_is_one to be variable.  While we are
specializing softfloat behaviour, allow other targets to eliminate
this runtime check.

Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Yongbok Kim <yongbok.kim@mips.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Alexander Graf <agraf@suse.de>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-05-10 14:48:17 -07:00
parent 5240a30dcc
commit 03385dfdaa
6 changed files with 44 additions and 30 deletions
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1
include/fpu/softfloat-types.h
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@ -173,6 +173,7 @@ typedef struct float_status {
/* should denormalised inputs go to zero and set the input_denormal flag? */
flag flush_inputs_to_zero;
flag default_nan_mode;
/* not always used -- see snan_bit_is_one() in softfloat-specialize.h */
flag snan_bit_is_one;
} float_status;