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-rw-r--r--src/math/i386/e_exp.s36
1 files changed, 36 insertions, 0 deletions
diff --git a/src/math/i386/e_exp.s b/src/math/i386/e_exp.s
new file mode 100644
index 00000000..d6c54a30
--- /dev/null
+++ b/src/math/i386/e_exp.s
@@ -0,0 +1,36 @@
+.global expf
+expf:
+ mov 4(%esp),%eax
+ flds 4(%esp)
+ shr $23,%eax
+ inc %al
+ jz 1f
+ jmp 0f
+
+.global exp
+exp:
+ mov 8(%esp),%eax
+ fldl 4(%esp)
+ shl %eax
+ cmp $0xffe00000,%eax
+ jae 1f
+
+0: fldl2e
+ fmulp
+ fst %st(1)
+ frndint
+ fst %st(2)
+ fsubrp
+ f2xm1
+ fld1
+ faddp
+ fscale
+ fstp %st(1)
+ ret
+
+1: fsts 4(%esp)
+ cmpl $0xff800000,4(%esp)
+ jnz 1f
+ fstp %st(0)
+ fldz
+1: ret