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target/s390x: Fix CONVERT TO LOGICAL/FIXED with out-of-range inputs

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CONVERT TO LOGICAL/FIXED deviate from IEEE 754 in that they raise an
inexact exception on out-of-range inputs. float_flag_invalid_cvti
aligns nicely with that behavior, so convert it to
S390_IEEE_MASK_INEXACT.

Cc: qemu-stable@nongnu.org
Fixes: defb0e3157 ("s390x: Implement opcode helpers")
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230724082032.66864-4-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 53684e344a)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Ilya Leoshkevich 2023-07-24 10:15:56 +02:00 committed by Michael Tokarev
parent 34009bfd68
commit 7cf3358451
1 changed files with 2 additions and 1 deletions
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3
target/s390x/tcg/fpu_helper.c
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@ -44,7 +44,8 @@ uint8_t s390_softfloat_exc_to_ieee(unsigned int exc)
s390_exc |= (exc & float_flag_divbyzero) ? S390_IEEE_MASK_DIVBYZERO : 0;
s390_exc |= (exc & float_flag_overflow) ? S390_IEEE_MASK_OVERFLOW : 0;
s390_exc |= (exc & float_flag_underflow) ? S390_IEEE_MASK_UNDERFLOW : 0;
s390_exc |= (exc & float_flag_inexact) ? S390_IEEE_MASK_INEXACT : 0;
s390_exc |= (exc & (float_flag_inexact | float_flag_invalid_cvti)) ?
S390_IEEE_MASK_INEXACT : 0;
return s390_exc;
}