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| author | Joseph Myers <joseph@codesourcery.com> | 2020-05-07 00:44:14 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-10 12:10:17 -0400 |
| commit | 0d48b436327955c69e2eb53f88aba9aa1e0dbaa0 (patch) | |
| tree | 213a5ebda7167b9e886062d49a02a7d593d72bb3 /target | |
| parent | c415f2c58296d86e9abb7e4a133111acf7031da3 (diff) | |
| download | qemu-0d48b436327955c69e2eb53f88aba9aa1e0dbaa0.zip qemu-0d48b436327955c69e2eb53f88aba9aa1e0dbaa0.tar.gz qemu-0d48b436327955c69e2eb53f88aba9aa1e0dbaa0.tar.bz2 | |
target/i386: fix fscale handling of signaling NaN
The implementation of the fscale instruction returns a NaN exponent
unchanged. Fix it to return a quiet NaN when the provided exponent is
a signaling NaN.
Signed-off-by: Joseph Myers <joseph@codesourcery.com>
Message-Id: <alpine.DEB.2.21.2005070043330.18350@digraph.polyomino.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target')
| -rw-r--r-- | target/i386/fpu_helper.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/target/i386/fpu_helper.c b/target/i386/fpu_helper.c index 568bd3b..0671de6 100644 --- a/target/i386/fpu_helper.c +++ b/target/i386/fpu_helper.c @@ -970,6 +970,10 @@ void helper_fscale(CPUX86State *env) { if (floatx80_is_any_nan(ST1)) { ST0 = ST1; + if (floatx80_is_signaling_nan(ST0, &env->fp_status)) { + float_raise(float_flag_invalid, &env->fp_status); + ST0 = floatx80_silence_nan(ST0, &env->fp_status); + } } else { int n = floatx80_to_int32_round_to_zero(ST1, &env->fp_status); ST0 = floatx80_scalbn(ST0, n, &env->fp_status); |