xref: /aosp_15_r20/external/musl/src/math/x86_64/exp2l.s (revision c9945492fdd68bbe62686c5b452b4dc1be3f8453)
1*c9945492SAndroid Build Coastguard Worker.global expm1l
2*c9945492SAndroid Build Coastguard Worker.type expm1l,@function
3*c9945492SAndroid Build Coastguard Workerexpm1l:
4*c9945492SAndroid Build Coastguard Worker	fldt 8(%rsp)
5*c9945492SAndroid Build Coastguard Worker	fldl2e
6*c9945492SAndroid Build Coastguard Worker	fmulp
7*c9945492SAndroid Build Coastguard Worker	movl $0xc2820000,-4(%rsp)
8*c9945492SAndroid Build Coastguard Worker	flds -4(%rsp)
9*c9945492SAndroid Build Coastguard Worker	fucomip %st(1),%st
10*c9945492SAndroid Build Coastguard Worker	fld1
11*c9945492SAndroid Build Coastguard Worker	jb 1f
12*c9945492SAndroid Build Coastguard Worker		# x*log2e <= -65, return -1 without underflow
13*c9945492SAndroid Build Coastguard Worker	fstp %st(1)
14*c9945492SAndroid Build Coastguard Worker	fchs
15*c9945492SAndroid Build Coastguard Worker	ret
16*c9945492SAndroid Build Coastguard Worker1:	fld %st(1)
17*c9945492SAndroid Build Coastguard Worker	fabs
18*c9945492SAndroid Build Coastguard Worker	fucomip %st(1),%st
19*c9945492SAndroid Build Coastguard Worker	fstp %st(0)
20*c9945492SAndroid Build Coastguard Worker	ja 1f
21*c9945492SAndroid Build Coastguard Worker	f2xm1
22*c9945492SAndroid Build Coastguard Worker	ret
23*c9945492SAndroid Build Coastguard Worker1:	push %rax
24*c9945492SAndroid Build Coastguard Worker	call 1f
25*c9945492SAndroid Build Coastguard Worker	pop %rax
26*c9945492SAndroid Build Coastguard Worker	fld1
27*c9945492SAndroid Build Coastguard Worker	fsubrp
28*c9945492SAndroid Build Coastguard Worker	ret
29*c9945492SAndroid Build Coastguard Worker
30*c9945492SAndroid Build Coastguard Worker.global exp2l
31*c9945492SAndroid Build Coastguard Worker.type exp2l,@function
32*c9945492SAndroid Build Coastguard Workerexp2l:
33*c9945492SAndroid Build Coastguard Worker	fldt 8(%rsp)
34*c9945492SAndroid Build Coastguard Worker1:	fld %st(0)
35*c9945492SAndroid Build Coastguard Worker	sub $16,%rsp
36*c9945492SAndroid Build Coastguard Worker	fstpt (%rsp)
37*c9945492SAndroid Build Coastguard Worker	mov 8(%rsp),%ax
38*c9945492SAndroid Build Coastguard Worker	and $0x7fff,%ax
39*c9945492SAndroid Build Coastguard Worker	cmp $0x3fff+13,%ax
40*c9945492SAndroid Build Coastguard Worker	jb 4f             # |x| < 8192
41*c9945492SAndroid Build Coastguard Worker	cmp $0x3fff+15,%ax
42*c9945492SAndroid Build Coastguard Worker	jae 3f            # |x| >= 32768
43*c9945492SAndroid Build Coastguard Worker	fsts (%rsp)
44*c9945492SAndroid Build Coastguard Worker	cmpl $0xc67ff800,(%rsp)
45*c9945492SAndroid Build Coastguard Worker	jb 2f             # x > -16382
46*c9945492SAndroid Build Coastguard Worker	movl $0x5f000000,(%rsp)
47*c9945492SAndroid Build Coastguard Worker	flds (%rsp)       # 0x1p63
48*c9945492SAndroid Build Coastguard Worker	fld %st(1)
49*c9945492SAndroid Build Coastguard Worker	fsub %st(1)
50*c9945492SAndroid Build Coastguard Worker	faddp
51*c9945492SAndroid Build Coastguard Worker	fucomip %st(1),%st
52*c9945492SAndroid Build Coastguard Worker	je 2f             # x - 0x1p63 + 0x1p63 == x
53*c9945492SAndroid Build Coastguard Worker	movl $1,(%rsp)
54*c9945492SAndroid Build Coastguard Worker	flds (%rsp)       # 0x1p-149
55*c9945492SAndroid Build Coastguard Worker	fdiv %st(1)
56*c9945492SAndroid Build Coastguard Worker	fstps (%rsp)      # raise underflow
57*c9945492SAndroid Build Coastguard Worker2:	fld1
58*c9945492SAndroid Build Coastguard Worker	fld %st(1)
59*c9945492SAndroid Build Coastguard Worker	frndint
60*c9945492SAndroid Build Coastguard Worker	fxch %st(2)
61*c9945492SAndroid Build Coastguard Worker	fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
62*c9945492SAndroid Build Coastguard Worker	f2xm1
63*c9945492SAndroid Build Coastguard Worker	faddp             # 2^(x-rint(x))
64*c9945492SAndroid Build Coastguard Worker1:	fscale
65*c9945492SAndroid Build Coastguard Worker	fstp %st(1)
66*c9945492SAndroid Build Coastguard Worker	add $16,%rsp
67*c9945492SAndroid Build Coastguard Worker	ret
68*c9945492SAndroid Build Coastguard Worker3:	xor %eax,%eax
69*c9945492SAndroid Build Coastguard Worker4:	cmp $0x3fff-64,%ax
70*c9945492SAndroid Build Coastguard Worker	fld1
71*c9945492SAndroid Build Coastguard Worker	jb 1b             # |x| < 0x1p-64
72*c9945492SAndroid Build Coastguard Worker	fstpt (%rsp)
73*c9945492SAndroid Build Coastguard Worker	fistl 8(%rsp)
74*c9945492SAndroid Build Coastguard Worker	fildl 8(%rsp)
75*c9945492SAndroid Build Coastguard Worker	fsubrp %st(1)
76*c9945492SAndroid Build Coastguard Worker	addl $0x3fff,8(%rsp)
77*c9945492SAndroid Build Coastguard Worker	f2xm1
78*c9945492SAndroid Build Coastguard Worker	fld1
79*c9945492SAndroid Build Coastguard Worker	faddp             # 2^(x-rint(x))
80*c9945492SAndroid Build Coastguard Worker	fldt (%rsp)       # 2^rint(x)
81*c9945492SAndroid Build Coastguard Worker	fmulp
82*c9945492SAndroid Build Coastguard Worker	add $16,%rsp
83*c9945492SAndroid Build Coastguard Worker	ret
84