diff --git a/math/libm-test.inc b/math/libm-test.inc
index 17d65b4..4981138 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -7306,14 +7306,13 @@ static const struct test_f_f_data floor_test_data[] =
     TEST_f_f (floor, snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
     TEST_f_f (floor, -snan_value, qnan_value, NO_INEXACT_EXCEPTION|INVALID_EXCEPTION),
 
-    /* Bug 15479: spurious "inexact" exception may occur.  */
-    TEST_f_f (floor, lit_pi, 3.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -lit_pi, -4.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, min_subnorm_value, 0.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, min_value, 0.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 0.1, 0.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 0.25, 0.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 0.625, 0.0, ERRNO_UNCHANGED),
+    TEST_f_f (floor, lit_pi, 3.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -lit_pi, -4.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, min_subnorm_value, 0.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, min_value, 0.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 0.1, 0.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 0.25, 0.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 0.625, 0.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, 1, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, 2, 2, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, 0x1p23, 0x1p23, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
@@ -7332,11 +7331,11 @@ static const struct test_f_f_data floor_test_data[] =
     TEST_f_f (floor, 0x1p113, 0x1p113, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, 0x1p114, 0x1p114, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, max_value, max_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
-    TEST_f_f (floor, -min_subnorm_value, -1.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -min_value, -1.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -0.1, -1.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -0.25, -1.0, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -0.625, -1.0, ERRNO_UNCHANGED),
+    TEST_f_f (floor, -min_subnorm_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -min_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -0.1, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -0.25, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -0.625, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, -1, -1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, -2, -2, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
     TEST_f_f (floor, -0x1p23, -0x1p23, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
@@ -7358,78 +7357,78 @@ static const struct test_f_f_data floor_test_data[] =
 
 #if MANT_DIG >= 64
     /* The result can only be represented in long double.  */
-    TEST_f_f (floor, 4503599627370495.5L, 4503599627370495.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370496.25L, 4503599627370496.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370496.5L, 4503599627370496.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370496.75L, 4503599627370496.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370497.5L, 4503599627370497.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370495.5L, 4503599627370495.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370496.25L, 4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370496.5L, 4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370496.75L, 4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370497.5L, 4503599627370497.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # if MANT_DIG > 100
-    TEST_f_f (floor, 4503599627370494.5000000000001L, 4503599627370494.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370495.5000000000001L, 4503599627370495.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 4503599627370496.5000000000001L, 4503599627370496.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370494.5000000000001L, 4503599627370494.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370495.5000000000001L, 4503599627370495.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 4503599627370496.5000000000001L, 4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # endif
 
-    TEST_f_f (floor, -4503599627370495.5L, -4503599627370496.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370496.25L, -4503599627370497.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370496.5L, -4503599627370497.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370496.75L, -4503599627370497.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370497.5L, -4503599627370498.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370495.5L, -4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370496.25L, -4503599627370497.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370496.5L, -4503599627370497.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370496.75L, -4503599627370497.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370497.5L, -4503599627370498.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # if MANT_DIG > 100
-    TEST_f_f (floor, -4503599627370494.5000000000001L, -4503599627370495.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370495.5000000000001L, -4503599627370496.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -4503599627370496.5000000000001L, -4503599627370497.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370494.5000000000001L, -4503599627370495.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370495.5000000000001L, -4503599627370496.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -4503599627370496.5000000000001L, -4503599627370497.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # endif
 
-    TEST_f_f (floor, 9007199254740991.5L, 9007199254740991.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740992.25L, 9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740992.5L, 9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740992.75L, 9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740993.5L, 9007199254740993.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740991.5L, 9007199254740991.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740992.25L, 9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740992.5L, 9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740992.75L, 9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740993.5L, 9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 
 # if MANT_DIG > 100
-    TEST_f_f (floor, 9007199254740991.0000000000001L, 9007199254740991.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740992.0000000000001L, 9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740993.0000000000001L, 9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740991.5000000000001L, 9007199254740991.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740992.5000000000001L, 9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 9007199254740993.5000000000001L, 9007199254740993.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740991.0000000000001L, 9007199254740991.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740992.0000000000001L, 9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740993.0000000000001L, 9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740991.5000000000001L, 9007199254740991.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740992.5000000000001L, 9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 9007199254740993.5000000000001L, 9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # endif
 
-    TEST_f_f (floor, -9007199254740991.5L, -9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740992.25L, -9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740992.5L, -9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740992.75L, -9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740993.5L, -9007199254740994.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740991.5L, -9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740992.25L, -9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740992.5L, -9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740992.75L, -9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740993.5L, -9007199254740994.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 
 # if MANT_DIG > 100
-    TEST_f_f (floor, -9007199254740991.0000000000001L, -9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740992.0000000000001L, -9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740993.0000000000001L, -9007199254740994.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740991.5000000000001L, -9007199254740992.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740992.5000000000001L, -9007199254740993.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -9007199254740993.5000000000001L, -9007199254740994.0L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740991.0000000000001L, -9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740992.0000000000001L, -9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740993.0000000000001L, -9007199254740994.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740991.5000000000001L, -9007199254740992.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740992.5000000000001L, -9007199254740993.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -9007199254740993.5000000000001L, -9007199254740994.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 # endif
 
-    TEST_f_f (floor, 72057594037927935.5L, 72057594037927935.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 72057594037927936.25L, 72057594037927936.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 72057594037927936.5L, 72057594037927936.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 72057594037927936.75L, 72057594037927936.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 72057594037927937.5L, 72057594037927937.0L, ERRNO_UNCHANGED),
-
-    TEST_f_f (floor, -72057594037927935.5L, -72057594037927936.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -72057594037927936.25L, -72057594037927937.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -72057594037927936.5L, -72057594037927937.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -72057594037927936.75L, -72057594037927937.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -72057594037927937.5L, -72057594037927938.0L, ERRNO_UNCHANGED),
-
-    TEST_f_f (floor, 10141204801825835211973625643007.5L, 10141204801825835211973625643007.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 10141204801825835211973625643008.25L, 10141204801825835211973625643008.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 10141204801825835211973625643008.5L, 10141204801825835211973625643008.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 10141204801825835211973625643008.75L, 10141204801825835211973625643008.0L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, 10141204801825835211973625643009.5L, 10141204801825835211973625643009.0L, ERRNO_UNCHANGED),
-
-    TEST_f_f (floor, 0xf.ffffffffffffff8p+47L, 0xf.fffffffffffep+47L, ERRNO_UNCHANGED),
-    TEST_f_f (floor, -0x8.000000000000004p+48L, -0x8.000000000001p+48L, ERRNO_UNCHANGED),
+    TEST_f_f (floor, 72057594037927935.5L, 72057594037927935.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 72057594037927936.25L, 72057594037927936.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 72057594037927936.5L, 72057594037927936.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 72057594037927936.75L, 72057594037927936.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 72057594037927937.5L, 72057594037927937.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+
+    TEST_f_f (floor, -72057594037927935.5L, -72057594037927936.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -72057594037927936.25L, -72057594037927937.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -72057594037927936.5L, -72057594037927937.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -72057594037927936.75L, -72057594037927937.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -72057594037927937.5L, -72057594037927938.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+
+    TEST_f_f (floor, 10141204801825835211973625643007.5L, 10141204801825835211973625643007.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 10141204801825835211973625643008.25L, 10141204801825835211973625643008.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 10141204801825835211973625643008.5L, 10141204801825835211973625643008.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 10141204801825835211973625643008.75L, 10141204801825835211973625643008.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, 10141204801825835211973625643009.5L, 10141204801825835211973625643009.0L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+
+    TEST_f_f (floor, 0xf.ffffffffffffff8p+47L, 0xf.fffffffffffep+47L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_f_f (floor, -0x8.000000000000004p+48L, -0x8.000000000001p+48L, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
 #endif
   };
 
diff --git a/sysdeps/i386/fpu/s_floor.S b/sysdeps/i386/fpu/s_floor.S
index 2d6287d..ed837da 100644
--- a/sysdeps/i386/fpu/s_floor.S
+++ b/sysdeps/i386/fpu/s_floor.S
@@ -9,10 +9,10 @@ RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")
 
 ENTRY(__floor)
 	fldl	4(%esp)
-	subl	$8,%esp
-	cfi_adjust_cfa_offset (8)
+	subl	$32,%esp
+	cfi_adjust_cfa_offset (32)
 
-	fstcw	4(%esp)			/* store fpu control word */
+	fnstenv	4(%esp)			/* store fpu environment */
 
 	/* We use here %edx although only the low 1 bits are defined.
 	   But none of the operations should care and they are faster
@@ -25,10 +25,10 @@ ENTRY(__floor)
 
 	frndint				/* round */
 
-	fldcw	4(%esp)			/* restore original control word */
+	fldenv	4(%esp)			/* restore original environment */
 
-	addl	$8,%esp
-	cfi_adjust_cfa_offset (-8)
+	addl	$32,%esp
+	cfi_adjust_cfa_offset (-32)
 	ret
 END (__floor)
 weak_alias (__floor, floor)
diff --git a/sysdeps/i386/fpu/s_floorf.S b/sysdeps/i386/fpu/s_floorf.S
index e969fbe..84b6f7e 100644
--- a/sysdeps/i386/fpu/s_floorf.S
+++ b/sysdeps/i386/fpu/s_floorf.S
@@ -9,10 +9,10 @@ RCSID("$NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $")
 
 ENTRY(__floorf)
 	flds	4(%esp)
-	subl	$8,%esp
-	cfi_adjust_cfa_offset (8)
+	subl	$32,%esp
+	cfi_adjust_cfa_offset (32)
 
-	fstcw	4(%esp)			/* store fpu control word */
+	fnstenv	4(%esp)			/* store fpu environment */
 
 	/* We use here %edx although only the low 1 bits are defined.
 	   But none of the operations should care and they are faster
@@ -25,10 +25,10 @@ ENTRY(__floorf)
 
 	frndint				/* round */
 
-	fldcw	4(%esp)			/* restore original control word */
+	fldenv	4(%esp)			/* restore original environment */
 
-	addl	$8,%esp
-	cfi_adjust_cfa_offset (-8)
+	addl	$32,%esp
+	cfi_adjust_cfa_offset (-32)
 	ret
 END (__floorf)
 weak_alias (__floorf, floorf)
diff --git a/sysdeps/i386/fpu/s_floorl.S b/sysdeps/i386/fpu/s_floorl.S
index 1206554..dc74a0c 100644
--- a/sysdeps/i386/fpu/s_floorl.S
+++ b/sysdeps/i386/fpu/s_floorl.S
@@ -10,10 +10,10 @@ RCSID("$NetBSD: $")
 
 ENTRY(__floorl)
 	fldt	4(%esp)
-	subl	$8,%esp
-	cfi_adjust_cfa_offset (8)
+	subl	$32,%esp
+	cfi_adjust_cfa_offset (32)
 
-	fstcw	4(%esp)			/* store fpu control word */
+	fnstenv	4(%esp)			/* store fpu environment */
 
 	/* We use here %edx although only the low 1 bits are defined.
 	   But none of the operations should care and they are faster
@@ -26,10 +26,15 @@ ENTRY(__floorl)
 
 	frndint				/* round */
 
-	fldcw	4(%esp)			/* restore original control word */
+	/* Preserve "invalid" exceptions from sNaN input.  */
+	fnstsw
+	andl	$0x1, %eax
+	orl	%eax, 8(%esp)
 
-	addl	$8,%esp
-	cfi_adjust_cfa_offset (-8)
+	fldenv	4(%esp)			/* restore original environment */
+
+	addl	$32,%esp
+	cfi_adjust_cfa_offset (-32)
 	ret
 END (__floorl)
 weak_alias (__floorl, floorl)
diff --git a/sysdeps/x86_64/fpu/s_floorl.S b/sysdeps/x86_64/fpu/s_floorl.S
index f9ecc38..535fdd8 100644
--- a/sysdeps/x86_64/fpu/s_floorl.S
+++ b/sysdeps/x86_64/fpu/s_floorl.S
@@ -10,20 +10,25 @@
 ENTRY(__floorl)
 	fldt	8(%rsp)
 
-	fstcw	-4(%rsp)		/* store fpu control word */
+	fnstenv	-28(%rsp)		/* store fpu environment */
 
 	/* We use here %edx although only the low 1 bits are defined.
 	   But none of the operations should care and they are faster
 	   than the 16 bit operations.  */
 	movl	$0x400,%edx		/* round towards -oo */
-	orl	-4(%rsp),%edx
+	orl	-28(%rsp),%edx
 	andl	$0xf7ff,%edx
-	movl	%edx,-8(%rsp)
-	fldcw	-8(%rsp)		/* load modified control word */
+	movl	%edx,-32(%rsp)
+	fldcw	-32(%rsp)		/* load modified control word */
 
 	frndint				/* round */
 
-	fldcw	-4(%rsp)		/* restore original control word */
+	/* Preserve "invalid" exceptions from sNaN input.  */
+	fnstsw
+	andl	$0x1, %eax
+	orl	%eax, -24(%rsp)
+
+	fldenv	-28(%rsp)		/* restore original environment */
 
 	ret
 END (__floorl)
