[newlib-cygwin] Fix modf/f for NaN input

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4ad9ba42fc3dd116bad8b9cb89d434256d3431fb

commit 4ad9ba42fc3dd116bad8b9cb89d434256d3431fb
Author: Fabian Schriever <fabian.schriever@gtd-gmbh.de>
Date:   Wed Mar 18 14:18:20 2020 +0100

    Fix modf/f for NaN input
    
    For NaN input the modf/f procedures should return NaN instead of zero
    with the sign of the input.

Diff:
---
 newlib/libm/common/s_modf.c  | 1 +
 newlib/libm/common/sf_modf.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/newlib/libm/common/s_modf.c b/newlib/libm/common/s_modf.c
index 8551a99e4..c948b8525 100644
--- a/newlib/libm/common/s_modf.c
+++ b/newlib/libm/common/s_modf.c
@@ -100,6 +100,7 @@ static double one = 1.0;
 	} else if (j0>51) {		/* no fraction part */
 	    __uint32_t high;
 	    *iptr = x*one;
+	    if (__fpclassifyd(x) == FP_NAN) return x+x; /* x is NaN, return NaN */
 	    GET_HIGH_WORD(high,x);
 	    INSERT_WORDS(x,high&0x80000000,0);	/* return +-0 */
 	    return x;
diff --git a/newlib/libm/common/sf_modf.c b/newlib/libm/common/sf_modf.c
index 6c64e3fa0..ae970762b 100644
--- a/newlib/libm/common/sf_modf.c
+++ b/newlib/libm/common/sf_modf.c
@@ -52,6 +52,7 @@ static float one = 1.0;
 	} else {			/* no fraction part */
 	    __uint32_t ix;
 	    *iptr = x*one;
+	    if (__fpclassifyf(x) == FP_NAN) return x+x; /* x is NaN, return NaN */
 	    GET_FLOAT_WORD(ix,x);
 	    SET_FLOAT_WORD(x,ix&0x80000000);	/* return +-0 */
 	    return x;