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Diffstat (limited to 'sysdeps/x86_64/fpu/e_log10l.S')
-rw-r--r--sysdeps/x86_64/fpu/e_log10l.S8
1 files changed, 7 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/e_log10l.S b/sysdeps/x86_64/fpu/e_log10l.S
index 2607ad199b..8fa61644c1 100644
--- a/sysdeps/x86_64/fpu/e_log10l.S
+++ b/sysdeps/x86_64/fpu/e_log10l.S
@@ -79,7 +79,13 @@ ENTRY(__log10l_finite)
 	fnstsw			// x-1 : x : log10(2)
 	andb	$0x45, %ah
 	jz	2b
-	fstp	%st(1)		// x-1 : log10(2)
+	fxam
+	fnstsw
+	andb	$0x45, %ah
+	cmpb	$0x40, %ah
+	jne	6f
+	fabs			// log10(1) is +0 in all rounding modes.
+6:	fstp	%st(1)		// x-1 : log10(2)
 	fyl2xp1			// log10(x)
 	ret
 END(__log10l_finite)