| Message ID | 20250213142613.151308-5-peter.maydell@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | target/i386: Emulate ftz and denormal flag bits correctly | expand |
On Thu, Feb 13, 2025 at 02:26:13PM +0000, Peter Maydell wrote: > Date: Thu, 13 Feb 2025 14:26:13 +0000 > From: Peter Maydell <peter.maydell@linaro.org> > Subject: [PATCH 4/4] tests/tcg/x86_64/fma: add test for exact-denormal > output > X-Mailer: git-send-email 2.43.0 > > Add some fma test cases that check for correct handling of FTZ and > for the flag that indicates that the input denormal was consumed. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> > Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > --- > tests/tcg/x86_64/fma.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
diff --git a/tests/tcg/x86_64/fma.c b/tests/tcg/x86_64/fma.c index 46f863005ed..34219614c0a 100644 --- a/tests/tcg/x86_64/fma.c +++ b/tests/tcg/x86_64/fma.c @@ -82,6 +82,18 @@ static testdata tests[] = { */ { 0x3fdfffffffffffff, 0x001fffffffffffff, 0x801fffffffffffff, true, 0x8010000000000000, 0x20 }, /* Enabling FTZ shouldn't change flags */ + /* + * normal * 0 + a denormal. With FTZ disabled this gives an exact + * result (equal to the input denormal) that has consumed the denormal. + */ + { 0x3cc8000000000000, 0x0000000000000000, 0x8008000000000000, false, + 0x8008000000000000, 0x2 }, /* Denormal */ + /* + * With FTZ enabled, this consumes the denormal, returns zero (because + * flushed) and indicates also Underflow and Precision. + */ + { 0x3cc8000000000000, 0x0000000000000000, 0x8008000000000000, true, + 0x8000000000000000, 0x32 }, /* Precision, Underflow, Denormal */ }; int main(void)