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target/arm: Copy entire float_status in is_ebf

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Now that float_status has a bunch of fp parameters,
it is easier to copy an existing structure than create
one from scratch.  Begin by copying the structure that
corresponds to the FPSR and make only the adjustments
required for BFloat16 semantics.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20241203203949.483774-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-11 15:31:03 +00:00 committed by Peter Maydell
parent 46eb7b92db
commit 47aa9001d8
1 changed files with 7 additions and 13 deletions
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20
target/arm/tcg/vec_helper.c
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@ -2813,25 +2813,19 @@ bool is_ebf(CPUARMState *env, float_status *statusp, float_status *oddstatusp)
* no effect on AArch32 instructions.
*/
bool ebf = is_a64(env) && env->vfp.fpcr & FPCR_EBF;
*statusp = (float_status){
.tininess_before_rounding = float_tininess_before_rounding,
.float_rounding_mode = float_round_to_odd_inf,
.flush_to_zero = true,
.flush_inputs_to_zero = true,
.default_nan_mode = true,
};
*statusp = env->vfp.fp_status;
set_default_nan_mode(true, statusp);
if (ebf) {
float_status *fpst = &env->vfp.fp_status;
set_flush_to_zero(get_flush_to_zero(fpst), statusp);
set_flush_inputs_to_zero(get_flush_inputs_to_zero(fpst), statusp);
set_float_rounding_mode(get_float_rounding_mode(fpst), statusp);
/* EBF=1 needs to do a step with round-to-odd semantics */
*oddstatusp = *statusp;
set_float_rounding_mode(float_round_to_odd, oddstatusp);
} else {
set_flush_to_zero(true, statusp);
set_flush_inputs_to_zero(true, statusp);
set_float_rounding_mode(float_round_to_odd_inf, statusp);
}
return ebf;
}