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target/loongarch: Explicitly set 2-NaN propagation rule

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Set the 2-NaN propagation rule explicitly in the float_status word we
use.

(There are a couple of places in fpu_helper.c where we create a
dummy float_status word with "float_status *s = { };", but these
are only used for calling float*_is_quiet_nan() so it doesn't
matter that we don't set a 2-NaN propagation rule there.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241025141254.2141506-6-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-11-05 10:09:54 +00:00
parent 0c587f1339
commit 1bb5257def
2 changed files with 4 additions and 3 deletions
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6
fpu/softfloat-specialize.c.inc
View File

@ -402,10 +402,10 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls,
/* target didn't set the rule: fall back to old ifdef choices */
#if defined(TARGET_AVR) || defined(TARGET_HEXAGON) \
|| defined(TARGET_RISCV) || defined(TARGET_SH4) \
|| defined(TARGET_TRICORE) || defined(TARGET_ARM) || defined(TARGET_MIPS)
|| defined(TARGET_TRICORE) || defined(TARGET_ARM) || defined(TARGET_MIPS) \
|| defined(TARGET_LOONGARCH64)
g_assert_not_reached();
#elif defined(TARGET_HPPA) || \
defined(TARGET_LOONGARCH64) || defined(TARGET_S390X)
#elif defined(TARGET_HPPA) || defined(TARGET_S390X)
rule = float_2nan_prop_s_ab;
#elif defined(TARGET_PPC) || defined(TARGET_M68K)
/*

1
target/loongarch/tcg/fpu_helper.c
View File

@ -31,6 +31,7 @@ void restore_fp_status(CPULoongArchState *env)
set_float_rounding_mode(ieee_rm[(env->fcsr0 >> FCSR0_RM) & 0x3],
&env->fp_status);
set_flush_to_zero(0, &env->fp_status);
set_float_2nan_prop_rule(float_2nan_prop_s_ab, &env->fp_status);
}
int ieee_ex_to_loongarch(int xcpt)