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target/tricore: Clarify special case for FTOUZ insn

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this is not something other ISAs do, so clarify it with a comment.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-ID: <20230828112651.522058-6-kbastian@mail.uni-paderborn.de>
This commit is contained in:
Bastian Koppelmann 2023-08-28 13:26:45 +02:00
parent 2bdbe35632
commit e43692bce6
1 changed files with 5 additions and 0 deletions
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5
target/tricore/fpu_helper.c
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@ -475,6 +475,11 @@ uint32_t helper_ftouz(CPUTriCoreState *env, uint32_t arg)
if (float32_is_any_nan(f_arg)) {
result = 0;
}
/*
* we need to check arg < 0.0 before rounding as TriCore needs to raise
* float_flag_invalid as well. For instance, when we have a negative
* exponent and sign, softfloat would only raise float_flat_inexact.
*/
} else if (float32_lt_quiet(f_arg, 0, &env->fp_status)) {
flags = float_flag_invalid;
result = 0;