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-rw-r--r--src/math/x86_64/expl.s85
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