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-rw-r--r--sysdeps/i386/fpu/e_log.S11
1 files changed, 10 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/e_log.S b/sysdeps/i386/fpu/e_log.S
index 5604e638f5..ce55b72292 100644
--- a/sysdeps/i386/fpu/e_log.S
+++ b/sysdeps/i386/fpu/e_log.S
@@ -36,11 +36,15 @@ limit: .double 0.29
ENTRY(__ieee754_log)
fldln2 // log(2)
fldl 4(%esp) // x : log(2)
+ fxam
+ fnstsw
#ifdef PIC
LOAD_PIC_REG (dx)
#endif
fld %st // x : x : log(2)
- fsubl MO(one) // x-1 : x : log(2)
+ sahf
+ jc 3f // in case x is NaN or +-Inf
+4: fsubl MO(one) // x-1 : x : log(2)
fld %st // x-1 : x-1 : x : log(2)
fabs // |x-1| : x-1 : x : log(2)
fcompl MO(limit) // x-1 : x : log(2)
@@ -54,4 +58,9 @@ ENTRY(__ieee754_log)
2: fstp %st(0) // x : log(2)
fyl2x // log(x)
ret
+
+3: jp 4b // in case x is +-Inf
+ fstp %st(1)
+ fstp %st(1)
+ ret
END (__ieee754_log)