Get address sanitizer mostly working

libc/tinymath/powil.S

@@ -0,0 +1,41 @@
+/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-│
+│vi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ This program is free software; you can redistribute it and/or modify         │
+│ it under the terms of the GNU General Public License as published by         │
+│ the Free Software Foundation; version 2 of the License.                      │
+│                                                                              │
+│ This program is distributed in the hope that it will be useful, but          │
+│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
+│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
+│ General Public License for more details.                                     │
+│                                                                              │
+│ You should have received a copy of the GNU General Public License            │
+│ along with this program; if not, write to the Free Software                  │
+│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
+│ 02110-1301 USA                                                               │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/macros.h"
+
+/	Returns 𝑥^𝑦.
+/
+/	@param	𝑥 is long double passed on stack
+/	@param	𝑦 is int passed in %edi
+/	@return	%st
+tinymath_powil:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	sub	$32,%rsp
+	mov	%edi,-4(%rbp)
+	fildl	-4(%rbp)
+	fstpt	(%rsp)
+	push	16+8(%rbp)
+	push	16+0(%rbp)
+	call	tinymath_powl
+	leave
+	ret
+	.endfn	tinymath_powil,globl
+	.alias	tinymath_powil,powil