make type of st_dev explicitly dev_t in x86_64 stat.h

[musl] / src / math / i386 / exp.s

diff --git a/src/math/i386/exp.s b/src/math/i386/exp.s
index f4769d5..abb9036 100644 (file)
--- a/src/math/i386/exp.s
+++ b/src/math/i386/exp.s
@@ -1,3 +1,70 @@
+.global expm1f
+.type expm1f,@function
+expm1f:
+       flds 4(%esp)
+       mov 4(%esp),%eax
+       add %eax,%eax
+       cmp $0x01000000,%eax
+       jae 1f
+               # subnormal x, return x with underflow
+       fnstsw %ax
+       and $16,%ax
+       jnz 2f
+       fld %st(0)
+       fmul %st(1)
+       fstps 4(%esp)
+2:     ret
+
+.global expm1l
+.type expm1l,@function
+expm1l:
+       fldt 4(%esp)
+       jmp 1f
+
+.global expm1
+.type expm1,@function
+expm1:
+       fldl 4(%esp)
+       mov 8(%esp),%eax
+       add %eax,%eax
+       cmp $0x00200000,%eax
+       jae 1f
+               # subnormal x, return x with underflow
+       fnstsw %ax
+       and $16,%ax
+       jnz 2f
+       fsts 4(%esp)
+2:     ret
+1:     fldl2e
+       fmulp
+       mov $0xc2820000,%eax
+       push %eax
+       flds (%esp)
+       pop %eax
+       fucomp %st(1)
+       fnstsw %ax
+       sahf
+       fld1
+       jb 1f
+               # x*log2e < -65, return -1 without underflow
+       fstp %st(1)
+       fchs
+       ret
+1:     fld %st(1)
+       fabs
+       fucom %st(1)
+       fnstsw %ax
+       fstp %st(0)
+       fstp %st(0)
+       sahf
+       ja 1f
+       f2xm1
+       ret
+1:     call 1f
+       fld1
+       fsubrp
+       ret
+
 .global exp2f
 .type exp2f,@function
 exp2f:
@@ -16,12 +83,6 @@ expf:
        flds 4(%esp)
        jmp 2f
 
-.global expl
-.type expl,@function
-expl:
-       fldt 4(%esp)
-       jmp 2f
-
 .global exp
 .type exp,@function
 exp:
@@ -34,22 +95,55 @@ exp:
 .type exp2,@function
 exp2:
        fldl 4(%esp)
-1:     fxam
-       fnstsw %ax
+1:     sub $12,%esp
+       fld %st(0)
+       fstpt (%esp)
+       mov 8(%esp),%ax
+       and $0x7fff,%ax
+       cmp $0x3fff+13,%ax
+       jb 4f             # |x| < 8192
+       cmp $0x3fff+15,%ax
+       jae 3f            # |x| >= 32768
+       fsts (%esp)
+       cmpl $0xc67ff800,(%esp)
+       jb 2f             # x > -16382
+       movl $0x5f000000,(%esp)
+       flds (%esp)       # 0x1p63
+       fld %st(1)
+       fsub %st(1)
+       faddp
+       fucomp %st(1)
+       fnstsw
        sahf
-       jnp 1f
-       jnc 1f
-       fstps 4(%esp)
-       mov $0xfe,%al
-       and %al,7(%esp)
-       flds 4(%esp)
-1:     fld %st(0)
+       je 2f             # x - 0x1p63 + 0x1p63 == x
+       movl $1,(%esp)
+       flds (%esp)       # 0x1p-149
+       fdiv %st(1)
+       fstps (%esp)      # raise underflow
+2:     fld1
+       fld %st(1)
        frndint
-       fxch %st(1)
-       fsub %st(1)
+       fxch %st(2)
+       fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
        f2xm1
-       fld1
-       faddp
-       fscale
+       faddp             # 2^(x-rint(x))
+1:     fscale
        fstp %st(1)
+       add $12,%esp
+       ret
+3:     xor %eax,%eax
+4:     cmp $0x3fff-64,%ax
+       fld1
+       jb 1b             # |x| < 0x1p-64
+       fstpt (%esp)
+       fistl 8(%esp)
+       fildl 8(%esp)
+       fsubrp %st(1)
+       addl $0x3fff,8(%esp)
+       f2xm1
+       fld1
+       faddp             # 2^(x-rint(x))
+       fldt (%esp)       # 2^rint(x)
+       fmulp
+       add $12,%esp
        ret