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Our float_flag_input_denormal exception flag is set when the fpu code flushes an input denormal to zero. This is what many guest architectures (eg classic Arm behaviour) require, but it is not the only donarmal-related reason we might want to set an exception flag. The x86 behaviour (which we do not currently model correctly) wants to see an exception flag when a denormal input is *not* flushed to zero and is actually used in an arithmetic operation. Arm's FEAT_AFP also wants these semantics. Rename float_flag_input_denormal to float_flag_input_denormal_flushed to make it clearer when it is set and to allow us to add a new float_flag_input_denormal_used next to it for the x86/FEAT_AFP semantics. Commit created with for f in `git grep -l float_flag_input_denormal`; do sed -i -e 's/float_flag_input_denormal/float_flag_input_denormal_flushed/' $f; done and manual editing of softfloat-types.h and softfloat.c to clean up the indentation afterwards and to fix a comment which wasn't using the full name of the flag. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20250124162836.2332150-20-peter.maydell@linaro.org |
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