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author | Bernhard Schommer <bernhardschommer@gmail.com> | 2022-03-22 16:03:57 +0100 |
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committer | Xavier Leroy <xavier.leroy@college-de-france.fr> | 2022-04-25 16:34:11 +0200 |
commit | 967c04de6c02bef349df579cddbfcac8cf262e6d (patch) | |
tree | 65be52a638e7f7ff559ea90a4111da0278b032bf /x86_32/Archi.v | |
parent | 9d3521b4db46773239a2c5f9f6970de826075508 (diff) | |
download | compcert-967c04de6c02bef349df579cddbfcac8cf262e6d.tar.gz compcert-967c04de6c02bef349df579cddbfcac8cf262e6d.zip |
Introduce float_conversion_default_nan parameter for float-float conversions
For RISC-V we need to return the canonical NaN value if the argument of
a float32->float64 or float64->float32 conversion is any NaN.
This is in line with 11.3 from the RISC-V manual, the description of
the conversion operations as well as what the spike ISA simulator and
qemu do.
Other platforms convert the NaN payload (by truncation or expansion)
in float32->float64 and float64->float32 conversions.
Fixes: #428
Diffstat (limited to 'x86_32/Archi.v')
-rw-r--r-- | x86_32/Archi.v | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/x86_32/Archi.v b/x86_32/Archi.v index 0a7f365b..775bdd44 100644 --- a/x86_32/Archi.v +++ b/x86_32/Archi.v @@ -59,6 +59,8 @@ Definition fma_invalid_mul_is_nan := false. Definition float_of_single_preserves_sNaN := false. +Definition float_conversion_default_nan := false. + (** Which ABI to use. *) Parameter win64: bool. (* Always false in 32 bits *) @@ -66,5 +68,5 @@ Global Opaque ptr64 big_endian splitlong default_nan_64 choose_nan_64 default_nan_32 choose_nan_32 fma_order fma_invalid_mul_is_nan - float_of_single_preserves_sNaN. - + float_of_single_preserves_sNaN + float_conversion_default_nan. |