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tests/tcg/x86_64/fma: add test for exact-denormal output

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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>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250519145114.2786534-5-peter.maydell@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Maydell 2025-05-19 15:51:14 +01:00 • committed by Paolo Bonzini
parent 57df511180
commit 3f9bdfb0dc
1 changed files with 12 additions and 0 deletions
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12
tests/tcg/x86_64/fma.c
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@ -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)