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target/microblaze: Explicitly set 2-NaN propagation rule

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Set the NaN propagation rule explicitly for the float_status word
used in the microblaze target.

This is probably not the architecturally correct behaviour,
but since this is a no-behaviour-change patch, we leave a
TODO note to that effect.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241025141254.2141506-19-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-11-05 10:09:57 +00:00
parent c18a13edce
commit 4fafdcc833
2 changed files with 7 additions and 1 deletions
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3
fpu/softfloat-specialize.c.inc
View File

@ -406,7 +406,8 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls,
|| defined(TARGET_LOONGARCH64) || defined(TARGET_HPPA) \
|| defined(TARGET_S390X) || defined(TARGET_PPC) || defined(TARGET_M68K) \
|| defined(TARGET_SPARC) || defined(TARGET_XTENSA) \
|| defined(TARGET_I386) || defined(TARGET_ALPHA)
|| defined(TARGET_I386) || defined(TARGET_ALPHA) \
|| defined(TARGET_MICROBLAZE)
g_assert_not_reached();
#else
rule = float_2nan_prop_x87;

5
target/microblaze/cpu.c
View File

@ -202,6 +202,11 @@ static void mb_cpu_reset_hold(Object *obj, ResetType type)
env->pc = cpu->cfg.base_vectors;
set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
/*
* TODO: this is probably not the correct NaN propagation rule for
* this architecture.
*/
set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
#if defined(CONFIG_USER_ONLY)
/* start in user mode with interrupts enabled. */