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fpu/softfloat: Add LoongArch specializations for pickNaN*

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The muladd (inf,zero,nan) case sets InvalidOp and returns the
input value 'c', and prefer sNaN over qNaN, in c,a,b order.
Binary operations prefer sNaN over qNaN and a,b order.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20220716085426.3098060-3-gaosong@loongson.cn>
[rth: Add specialization for pickNaN]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Song Gao 2022-07-16 16:54:20 +08:00 committed by Richard Henderson
parent fa90456f78
commit 2344f98e9c
1 changed files with 25 additions and 1 deletions
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26
fpu/softfloat-specialize.c.inc
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@ -390,7 +390,8 @@ bool float32_is_signaling_nan(float32 a_, float_status *status)
static int pickNaN(FloatClass a_cls, FloatClass b_cls, static int pickNaN(FloatClass a_cls, FloatClass b_cls,
bool aIsLargerSignificand, float_status *status) bool aIsLargerSignificand, float_status *status)
{ {
#if defined(TARGET_ARM) || defined(TARGET_MIPS) || defined(TARGET_HPPA) #if defined(TARGET_ARM) || defined(TARGET_MIPS) || defined(TARGET_HPPA) \
|| defined(TARGET_LOONGARCH64)
/* ARM mandated NaN propagation rules (see FPProcessNaNs()), take /* ARM mandated NaN propagation rules (see FPProcessNaNs()), take
* the first of: * the first of:
* 1. A if it is signaling * 1. A if it is signaling
@ -574,6 +575,29 @@ static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
return 1; return 1;
} }
} }
#elif defined(TARGET_LOONGARCH64)
/*
* For LoongArch systems that conform to IEEE754-2008, the (inf,zero,nan)
* case sets InvalidOp and returns the input value 'c'
*/
if (infzero) {
float_raise(float_flag_invalid | float_flag_invalid_imz, status);
return 2;
}
/* Prefer sNaN over qNaN, in the c, a, b order. */
if (is_snan(c_cls)) {
return 2;
} else if (is_snan(a_cls)) {
return 0;
} else if (is_snan(b_cls)) {
return 1;
} else if (is_qnan(c_cls)) {
return 2;
} else if (is_qnan(a_cls)) {
return 0;
} else {
return 1;
}
#elif defined(TARGET_PPC) #elif defined(TARGET_PPC)
/* For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer /* For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer
* to return an input NaN if we have one (ie c) rather than generating * to return an input NaN if we have one (ie c) rather than generating