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fpu: Rename float_flag_input_denormal to float_flag_input_denormal_flushed

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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
This commit is contained in:
Peter Maydell 2025-01-24 16:27:39 +00:00
parent 3847b5b1fb
commit 584b7aec81
8 changed files with 19 additions and 18 deletions
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5
include/fpu/softfloat-types.h
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@ -154,7 +154,8 @@ enum {
float_flag_overflow = 0x0004,
float_flag_underflow = 0x0008,
float_flag_inexact = 0x0010,
float_flag_input_denormal = 0x0020,
/* We flushed an input denormal to 0 (because of flush_inputs_to_zero) */
float_flag_input_denormal_flushed = 0x0020,
float_flag_output_denormal = 0x0040,
float_flag_invalid_isi = 0x0080, /* inf - inf */
float_flag_invalid_imz = 0x0100, /* inf * 0 */
@ -302,7 +303,7 @@ typedef struct float_status {
bool tininess_before_rounding;
/* should denormalised results go to zero and set the inexact flag? */
bool flush_to_zero;
/* should denormalised inputs go to zero and set the input_denormal flag? */
/* should denormalised inputs go to zero and set input_denormal_flushed? */
bool flush_inputs_to_zero;
bool default_nan_mode;
/*