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 ca0de1d..abb9036 100644 (file)
--- a/src/math/i386/exp.s
+++ b/src/math/i386/exp.s
@@ -2,7 +2,18 @@
 .type expm1f,@function
 expm1f:
        flds 4(%esp)
-       jmp 1f
+       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
@@ -14,10 +25,32 @@ expm1l:
 .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
-       fld %st(1)
+       jb 1f
+               # x*log2e < -65, return -1 without underflow
+       fstp %st(1)
+       fchs
+       ret
+1:     fld %st(1)
        fabs
        fucom %st(1)
        fnstsw %ax
@@ -50,12 +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:
@@ -68,52 +95,55 @@ exp:
 .type exp2,@function
 exp2:
        fldl 4(%esp)
-1:     pushl $0x467ff000
-       flds (%esp)
-       xorl %eax,%eax
-       pushl $0x80000000
-       push %eax
+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)
-       fabs
-       fucom %st(1)
+       fsub %st(1)
+       faddp
+       fucomp %st(1)
        fnstsw
-       fstp %st(0)
-       fstp %st(0)
        sahf
-       ja 2f
-       fld %st(0)
-       fistpl 8(%esp)
-       fildl 8(%esp)
-       fxch %st(1)
-       fsub %st(1)
-       mov $0x3fff,%eax
-       add %eax,8(%esp)
+       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(2)
+       fsub %st(2)       # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
        f2xm1
-       fld1
-       faddp
-       fldt (%esp)
-       fmulp
+       faddp             # 2^(x-rint(x))
+1:     fscale
        fstp %st(1)
        add $12,%esp
        ret
-
-2:     fld %st(0)
+3:     xor %eax,%eax
+4:     cmp $0x3fff-64,%ax
+       fld1
+       jb 1b             # |x| < 0x1p-64
        fstpt (%esp)
-       mov 9(%esp),%ah
-       and $0x7f,%ah
-       cmp $0x7f,%ah
-       jne 1f
-       decb 9(%esp)
-       fstp %st(0)
-       fldt (%esp)
-1:     fld %st(0)
-       frndint
-       fxch %st(1)
-       fsub %st(1)
+       fistl 8(%esp)
+       fildl 8(%esp)
+       fsubrp %st(1)
+       addl $0x3fff,8(%esp)
        f2xm1
        fld1
-       faddp
-       fscale
-       fstp %st(1)
+       faddp             # 2^(x-rint(x))
+       fldt (%esp)       # 2^rint(x)
+       fmulp
        add $12,%esp
        ret