# This file is vendored from musl and is licensed under MIT license:
#
# ----------------------------------------------------------------------
# Copyright © 2005-2020 Rich Felker, et al.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# ----------------------------------------------------------------------

.global rt.feclearexcept
.type rt.feclearexcept,@function
rt.feclearexcept:
		# maintain exceptions in the sse mxcsr, clear x87 exceptions
	mov %edi,%ecx
	and $0x3f,%ecx
	fnstsw %ax
	test %eax,%ecx
	jz 1f
	fnclex
1:	stmxcsr -8(%rsp)
	and $0x3f,%eax
	or %eax,-8(%rsp)
	test %ecx,-8(%rsp)
	jz 1f
	not %ecx
	and %ecx,-8(%rsp)
	ldmxcsr -8(%rsp)
1:	xor %eax,%eax
	ret

.global rt.feraiseexcept
.type rt.feraiseexcept,@function
rt.feraiseexcept:
	and $0x3f,%edi
	stmxcsr -8(%rsp)
	or %edi,-8(%rsp)
	ldmxcsr -8(%rsp)
	xor %eax,%eax
	ret

.global rt.fesetround
.type rt.fesetround,@function
rt.fesetround:
	push %rax
	xor %eax,%eax
	mov %edi,%ecx
	fnstcw (%rsp)
	andb $0xf3,1(%rsp)
	or %ch,1(%rsp)
	fldcw (%rsp)
	stmxcsr (%rsp)
	shl $3,%ch
	andb $0x9f,1(%rsp)
	or %ch,1(%rsp)
	ldmxcsr (%rsp)
	pop %rcx
	ret

.global rt.fegetround
.type rt.fegetround,@function
rt.fegetround:
	push %rax
	stmxcsr (%rsp)
	pop %rax
	shr $3,%eax
	and $0xc00,%eax
	ret

.global rt.fetestexcept
.type rt.fetestexcept,@function
rt.fetestexcept:
	and $0x3f,%edi
	push %rax
	stmxcsr (%rsp)
	pop %rsi
	fnstsw %ax
	or %esi,%eax
	and %edi,%eax
	ret
