1 files changed, 85 insertions, 0 deletions
diff --git a/src/math/x86_64/expl.s b/src/math/x86_64/expl.s
new file mode 100644
index 00000000..64c1c78e
--- /dev/null
+++ b/src/math/x86_64/expl.s
@@ -0,0 +1,85 @@
+.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)
+	fld %st(1)
+	fabs
+	fucom %st(1)
+	fnstsw
+	fstp %st(0)
+	fstp %st(0)
+	sahf
+	ja 2f
+	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
+	fldt -24(%rsp)
+	fmulp
+	fstp %st(1)
+	ret
+
+2:	fld %st(0)
+	fstpt -24(%rsp)
+	mov -15(%rsp),%ah
+	and $0x7f,%ah
+	cmp $0x7f,%ah
+	jne 1f
+	decb -15(%rsp)
+	fstp %st(0)
+	fldt -24(%rsp)
+1:	fld %st(0)
+	frndint
+	fxch %st(1)
+	fsub %st(1)
+	f2xm1
+	fld1
+	faddp
+	fscale
+	fstp %st(1)
+	ret