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target-i386: fix helper_fscale() wrt softfloat

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Use the scalbn softfloat function to implement helper_fscale(). This
fixes corner cases (e.g. NaN) and makes a few more GNU libc math tests
to pass.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2011-04-20 13:04:23 +02:00
parent 4cc5383f80
commit be1c17c7fd
2 changed files with 10 additions and 1 deletions
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7
target-i386/op_helper.c
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@ -4174,7 +4174,12 @@ void helper_frndint(void)
void helper_fscale(void)
{
ST0 = ldexp (ST0, (int)(ST1));
if (floatx_is_any_nan(ST1)) {
ST0 = ST1;
} else {
int n = floatx_to_int32_round_to_zero(ST1, &env->fp_status);
ST0 = floatx_scalbn(ST0, n, &env->fp_status);
}
}
void helper_fsin(void)