From 2e77dc13f8bc2053642fcb136996f5f36c88c775 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 16 Mar 2012 23:58:49 -0400
Subject: [PATCH] make fma and lrint functions build without full fenv support

this is necessary to support archs where fenv is incomplete or
unavailable (presently arm). fma, fmal, and the lrint family should
work perfectly fine with this change; fmaf is slightly broken with
respect to rounding as it depends on non-default rounding modes to do
its work.
---
 src/math/fma.c   | 14 ++++++++++++--
 src/math/fmaf.c  |  2 ++
 src/math/fmal.c  | 14 ++++++++++++--
 src/math/lrint.c |  2 ++
 4 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/math/fma.c b/src/math/fma.c
index c53f3148..f44ecda7 100644
--- a/src/math/fma.c
+++ b/src/math/fma.c
@@ -199,27 +199,37 @@ double fma(double x, double y, double z)
 	 * modes other than FE_TONEAREST are painful.
 	 */
 	if (spread < -DBL_MANT_DIG) {
+#ifdef FE_INEXACT
 		feraiseexcept(FE_INEXACT);
+#endif
+#ifdef FE_UNDERFLOW
 		if (!isnormal(z))
 			feraiseexcept(FE_UNDERFLOW);
+#endif
 		switch (oround) {
-		case FE_TONEAREST:
+		default: /* FE_TONEAREST */
 			return (z);
+#ifdef FE_TOWARDZERO
 		case FE_TOWARDZERO:
 			if (x > 0.0 ^ y < 0.0 ^ z < 0.0)
 				return (z);
 			else
 				return (nextafter(z, 0));
+#endif
+#ifdef FE_DOWNWARD
 		case FE_DOWNWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (z);
 			else
 				return (nextafter(z, -INFINITY));
-		default:        /* FE_UPWARD */
+#endif
+#ifdef FE_UPWARD
+		case FE_UPWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (nextafter(z, INFINITY));
 			else
 				return (z);
+#endif
 		}
 	}
 	if (spread <= DBL_MANT_DIG * 2)
diff --git a/src/math/fmaf.c b/src/math/fmaf.c
index 0dccf108..cc427fb5 100644
--- a/src/math/fmaf.c
+++ b/src/math/fmaf.c
@@ -54,7 +54,9 @@ float fmaf(float x, float y, float z)
 	 * If result is inexact, and exactly halfway between two float values,
 	 * we need to adjust the low-order bit in the direction of the error.
 	 */
+#ifdef FE_TOWARDZERO
 	fesetround(FE_TOWARDZERO);
+#endif
 	volatile double vxy = xy;  /* XXX work around gcc CSE bug */
 	double adjusted_result = vxy + z;
 	fesetround(FE_TONEAREST);
diff --git a/src/math/fmal.c b/src/math/fmal.c
index 200bd5a5..3944c292 100644
--- a/src/math/fmal.c
+++ b/src/math/fmal.c
@@ -194,27 +194,37 @@ long double fmal(long double x, long double y, long double z)
 	 * modes other than FE_TONEAREST are painful.
 	 */
 	if (spread < -LDBL_MANT_DIG) {
+#ifdef FE_INEXACT
 		feraiseexcept(FE_INEXACT);
+#endif
+#ifdef FE_UNDERFLOW
 		if (!isnormal(z))
 			feraiseexcept(FE_UNDERFLOW);
+#endif
 		switch (oround) {
-		case FE_TONEAREST:
+		default: /* FE_TONEAREST */
 			return (z);
+#ifdef FE_TOWARDZERO
 		case FE_TOWARDZERO:
 			if (x > 0.0 ^ y < 0.0 ^ z < 0.0)
 				return (z);
 			else
 				return (nextafterl(z, 0));
+#endif
+#ifdef FE_DOWNWARD
 		case FE_DOWNWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (z);
 			else
 				return (nextafterl(z, -INFINITY));
-		default:        /* FE_UPWARD */
+#endif
+#ifdef FE_UPWARD
+		case FE_UPWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (nextafterl(z, INFINITY));
 			else
 				return (z);
+#endif
 		}
 	}
 	if (spread <= LDBL_MANT_DIG * 2)
diff --git a/src/math/lrint.c b/src/math/lrint.c
index 98d58ad0..9754fa74 100644
--- a/src/math/lrint.c
+++ b/src/math/lrint.c
@@ -49,8 +49,10 @@ dtype fn(type x)
 
 	feholdexcept(&env);
 	d = (dtype)roundit(x);
+#if defined(FE_INVALID) && defined(FE_INEXACT)
 	if (fetestexcept(FE_INVALID))
 		feclearexcept(FE_INEXACT);
+#endif
 	feupdateenv(&env);
 	return d;
 }
-- 
2.25.1