#include <machine/asm.h>
-#ifdef __ELF__
- .section .rodata
-#else
- .text
-#endif
- .align ALIGNARG(4)
+ .section .rodata.cst8,"aM",@progbits,8
+
+ .p2align 3
ASM_TYPE_DIRECTIVE(one,@object)
one: .double 1.0
ASM_SIZE_DIRECTIVE(one)
#ifdef PIC
-#define MO(op) op##(%rip)
+# define MO(op) op##(%rip)
#else
-#define MO(op) op
+# define MO(op) op
#endif
.text
fxam
fnstsw
fld %st // x : x : 1
- andb $1,%ah
+ testb $1, %ah
jnz 3f // in case x is NaN or ±Inf
4: fsub %st(2), %st // x-1 : x : 1
fld %st // x-1 : x-1 : x : 1
fyl2x // log(x)
ret
-3: jp 4b // in case x is ±Inf
+3: testb $4, %ah
+ jnz 4b // in case x is ±Inf
fstp %st(1)
fstp %st(1)
ret
END (__ieee754_log2l)
+
+
+ENTRY(__log2l_finite)
+ fldl MO(one)
+ fldt 8(%rsp) // x : 1
+ fld %st // x : x : 1
+ fsub %st(2), %st // x-1 : x : 1
+ fld %st // x-1 : x-1 : x : 1
+ fabs // |x-1| : x-1 : x : 1
+ fcompl MO(limit) // x-1 : x : 1
+ fnstsw // x-1 : x : 1
+ andb $0x45, %ah
+ jz 2b
+ fstp %st(1) // x-1 : 1
+ fyl2xp1 // log(x)
+ ret
+END (__log2l_finite)