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.mayd...@linaro.org>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
---
tests/tcg/x86_64/fma.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
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)
--
2.43.0
