math: move x86_64 exp2l implementation to exp2l.s from expl.s

src/math/x86_64/exp2l.s

-# see expl.s
+.global expm1l
+.type expm1l,@function
+expm1l:
+	fldt 8(%rsp)
+	fldl2e
+	fmulp
+	fld1
+	fld %st(1)
+	fabs
+	fucom %st(1)
+	fnstsw %ax
+	fstp %st(0)
+	fstp %st(0)
+	sahf
+	ja 1f
+	f2xm1
+	ret
+1:	push %rax
+	call 1f
+	pop %rax
+	fld1
+	fsubrp
+	ret
+
+.global exp2l
+.type exp2l,@function
+exp2l:
+	fldt 8(%rsp)
+1:	mov $0x467ff000,%eax
+	mov %eax,-16(%rsp)
+	mov $0x80000000,%eax
+	mov %eax,-20(%rsp)
+	xor %eax,%eax
+	mov %eax,-24(%rsp)
+	flds -16(%rsp)    # 16380
+	fld %st(1)
+	fabs
+	fucom %st(1)
+	fnstsw
+	fstp %st(0)
+	fstp %st(0)
+	sahf
+	ja 3f             # |x| > 16380
+	jp 2f             # x is nan (avoid invalid except in fistp)
+	fld %st(0)
+	fistpl -16(%rsp)
+	fildl -16(%rsp)
+	fxch %st(1)
+	fsub %st(1)
+	mov $0x3fff,%eax
+	add %eax,-16(%rsp)
+	f2xm1
+	fld1
+	faddp             # 2^(x-rint(x))
+	fldt -24(%rsp)    # 2^rint(x)
+	fmulp
+2:	fstp %st(1)
+	ret
+
+3:	fld %st(0)
+	fstpt -24(%rsp)
+	fld1
+	mov -15(%rsp),%ax
+	and $0x7fff,%ax
+	cmp $0x7fff,%ax
+	je 1f             # x = +-inf
+	fld %st(1)
+	frndint
+	fxch %st(2)
+	fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
+	f2xm1
+	faddp             # 2^(x-rint(x))
+1:	fscale
+	fstp %st(1)
+	ret

src/math/x86_64/expl.s

-.global expm1l
-.type expm1l,@function
-expm1l:
-	fldt 8(%rsp)
-1:	fldl2e
-	fmulp
-	fld1
-	fld %st(1)
-	fabs
-	fucom %st(1)
-	fnstsw %ax
-	fstp %st(0)
-	fstp %st(0)
-	sahf
-	ja 1f
-	f2xm1
-	ret
-1:	push %rax
-	call 1f
-	pop %rax
-	fld1
-	fsubrp
-	ret
-
-.global expl
-.type expl,@function
-expl:
-	fldt 8(%rsp)
-	fldl2e
-	fmulp
-	jmp 1f
-
-.global exp2l
-.type exp2l,@function
-exp2l:
-	fldt 8(%rsp)
-1:	mov $0x467ff000,%eax
-	mov %eax,-16(%rsp)
-	mov $0x80000000,%eax
-	mov %eax,-20(%rsp)
-	xor %eax,%eax
-	mov %eax,-24(%rsp)
-	flds -16(%rsp)    # 16380
-	fld %st(1)
-	fabs
-	fucom %st(1)
-	fnstsw
-	fstp %st(0)
-	fstp %st(0)
-	sahf
-	ja 3f             # |x| > 16380
-	jp 2f             # x is nan (avoid invalid except in fistp)
-	fld %st(0)
-	fistpl -16(%rsp)
-	fildl -16(%rsp)
-	fxch %st(1)
-	fsub %st(1)
-	mov $0x3fff,%eax
-	add %eax,-16(%rsp)
-	f2xm1
-	fld1
-	faddp             # 2^(x-rint(x))
-	fldt -24(%rsp)    # 2^rint(x)
-	fmulp
-2:	fstp %st(1)
-	ret
-
-3:	fld %st(0)
-	fstpt -24(%rsp)
-	fld1
-	mov -15(%rsp),%ax
-	and $0x7fff,%ax
-	cmp $0x7fff,%ax
-	je 1f             # x = +-inf
-	fld %st(1)
-	frndint
-	fxch %st(2)
-	fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
-	f2xm1
-	faddp             # 2^(x-rint(x))
-1:	fscale
-	fstp %st(1)
-	ret

src/math/x86_64/expm1l.s

-# see expm1.s
+# see exp2l.s