softfloat: add uint128_to_float128

Based on parts_uint_to_float, implements uint128_to_float128 to convert
an unsigned 128-bit value received through an Int128 argument.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-4-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index d34b2c4..8e026e5 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -95,6 +95,7 @@
 
 #include "fpu/softfloat-types.h"
 #include "fpu/softfloat-helpers.h"
+#include "qemu/int128.h"
 
 /*----------------------------------------------------------------------------
 | Routine to raise any or all of the software IEC/IEEE floating-point
@@ -183,6 +184,7 @@
 float128 int32_to_float128(int32_t, float_status *status);
 float128 int64_to_float128(int64_t, float_status *status);
 float128 uint64_to_float128(uint64_t, float_status *status);
+float128 uint128_to_float128(Int128, float_status *status);
 
 /*----------------------------------------------------------------------------
 | Software half-precision conversion routines.