[PATCH] libm: switch sf_log1p from double error routines to float

[Keith Packard]

sf_log1p was using __math_divzero and __math_invalid, which
drag in a pile of double-precision code. Switch to using the
single-precision variants. This also required making those
available in __OBSOLETE_MATH mode.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 newlib/libm/common/math_errf.c | 2 --
 newlib/libm/common/sf_log1p.c  | 4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/newlib/libm/common/math_errf.c b/newlib/libm/common/math_errf.c
index 762fc2799..53c68b1cf 100644
--- a/newlib/libm/common/math_errf.c
+++ b/newlib/libm/common/math_errf.c
@@ -75,7 +75,6 @@ __math_oflowf (uint32_t sign)
   return xflowf (sign, 0x1p97f);
 }
 
-#if !__OBSOLETE_MATH
 HIDDEN float
 __math_divzerof (uint32_t sign)
 {
@@ -89,4 +88,3 @@ __math_invalidf (float x)
   float y = (x - x) / (x - x);
   return isnan (x) ? y : with_errnof (y, EDOM);
 }
-#endif /* !__OBSOLETE_MATH */
diff --git a/newlib/libm/common/sf_log1p.c b/newlib/libm/common/sf_log1p.c
index d86768082..d326e00ba 100644
--- a/newlib/libm/common/sf_log1p.c
+++ b/newlib/libm/common/sf_log1p.c
@@ -56,9 +56,9 @@ static float zero = 0.0;
 	if (hx < 0x3ed413d7) {			/* x < 0.41422  */
 	    if(ax>=0x3f800000) {		/* x <= -1.0 */
 		if(x==(float)-1.0)
-		    return __math_divzero (1); /* log1p(-1)=-inf */
+		    return __math_divzerof (1); /* log1p(-1)=-inf */
 		else
-		    return __math_invalid (x);	/* log1p(x<-1)=NaN */
+		    return __math_invalidf (x);	/* log1p(x<-1)=NaN */
 	    }
 	    if(ax<0x31000000) {			/* |x| < 2**-29 */
 		if(two25+x>zero			/* raise inexact */
-- 
2.24.0