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target/ppc: Explicitly set 2-NaN propagation rule

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Set the 2-NaN propagation rule explicitly in env->fp_status
and env->vec_status.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241025141254.2141506-9-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-11-05 10:09:54 +00:00
parent 841f9d7475
commit 5aaab56a1a
2 changed files with 10 additions and 8 deletions
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10
fpu/softfloat-specialize.c.inc
View File

@ -404,15 +404,9 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls,
|| defined(TARGET_RISCV) || defined(TARGET_SH4) \
|| defined(TARGET_TRICORE) || defined(TARGET_ARM) || defined(TARGET_MIPS) \
|| defined(TARGET_LOONGARCH64) || defined(TARGET_HPPA) \
|| defined(TARGET_S390X)
|| defined(TARGET_S390X) || defined(TARGET_PPC)
g_assert_not_reached();
#elif defined(TARGET_PPC) || defined(TARGET_M68K)
/*
* PowerPC propagation rules:
* 1. A if it sNaN or qNaN
* 2. B if it sNaN or qNaN
* A signaling NaN is always silenced before returning it.
*/
#elif defined(TARGET_M68K)
/*
* M68000 FAMILY PROGRAMMER'S REFERENCE MANUAL
* 3.4 FLOATING-POINT INSTRUCTION DETAILS

8
target/ppc/cpu_init.c
View File

@ -7326,6 +7326,14 @@ static void ppc_cpu_reset_hold(Object *obj, ResetType type)
/* tininess for underflow is detected before rounding */
set_float_detect_tininess(float_tininess_before_rounding,
&env->fp_status);
/*
* PowerPC propagation rules:
* 1. A if it sNaN or qNaN
* 2. B if it sNaN or qNaN
* A signaling NaN is always silenced before returning it.
*/
set_float_2nan_prop_rule(float_2nan_prop_ab, &env->fp_status);
set_float_2nan_prop_rule(float_2nan_prop_ab, &env->vec_status);
for (i = 0; i < ARRAY_SIZE(env->spr_cb); i++) {
ppc_spr_t *spr = &env->spr_cb[i];