From: Peter Maydell Date: Mon, 19 May 2025 14:51:14 +0000 (+0100) Subject: tests/tcg/x86_64/fma: add test for exact-denormal output X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3f9bdfb0dc8162cbc080c868625336178ddcda56;p=thirdparty%2Fqemu.git tests/tcg/x86_64/fma: add test for exact-denormal output 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 Reviewed-by: Richard Henderson Reviewed-by: Zhao Liu Link: https://lore.kernel.org/r/20250519145114.2786534-5-peter.maydell@linaro.org Signed-off-by: Paolo Bonzini --- diff --git a/tests/tcg/x86_64/fma.c b/tests/tcg/x86_64/fma.c index 46f863005e..34219614c0 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)