added missing math functions from intel's libm

rs-libc/LICENSE

@@ -29,6 +29,21 @@ Adapted from musl-libc (license below):
     src/c/strtod.c
     src/c/strtol.c
 
+Adapted from Intel's linux-sgx libm (license below):
+	src/asm/x86_64/copysignl.S
+	src/asm/x86_64/fabs.S
+	src/asm/x86_64/fmodl.S
+	src/asm/x86_64/frexp_gen.S
+	src/asm/x86_64/frexpf.S
+	src/asm/x86_64/frexpl.S
+	src/asm/x86_64/ldexp_gen.S
+	src/asm/x86_64/ldexpf.S
+	src/asm/x86_64/ldexpl.S
+	src/asm/x86_64/scalblnl.S
+	src/asm/x86_64/scalbn_gen.S
+	src/asm/x86_64/scalbnl.S
+	src/asm/x86_64/sqrt.S
+
 Adapted from Patrick Powell (license in file):
     src/c/snprintf.c
 
@@ -56,3 +71,37 @@ 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.
+
+
+----------------------------------------------------------------------
+Intel's linux-sgx libm is licensed under the following:
+
+----------------------------------------------------------------------
+
+Copyright (C) 2016 Intel Corporation. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+  * Neither the name of Intel Corporation nor the names of its
+    contributors may be used to endorse or promote products derived
+
+from this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

rs-libc/src/asm/x86_64/copysignl.S

@@ -0,0 +1,83 @@
+	.file "copysignl.c"
+	.text
+..TXTST0:
+# -- Begin  copysignl
+	.text
+       .align    16,0x90
+	.globl copysignl
+copysignl:
+# parameter 1: 64 + %rsp
+# parameter 2: 80 + %rsp
+..B1.1:
+	.cfi_startproc
+..___tag_value_copysignl.1:
+..L2:
+
+        subq      $56, %rsp
+	.cfi_def_cfa_offset 64
+        xorb      %sil, %sil
+        fldt      64(%rsp)
+        fstpt     (%rsp)
+..B1.2:
+        fnstcw    50(%rsp)
+..B1.3:
+        movzwl    50(%rsp), %edx
+        movl      %edx, %eax
+        andl      $768, %eax
+        cmpl      $768, %eax
+        je        ..B1.7
+..B1.4:
+        orl       $-64768, %edx
+        movw      %dx, 48(%rsp)
+..B1.5:
+        fldcw     48(%rsp)
+..B1.6:
+        movb      $1, %sil
+..B1.7:
+        fldt      80(%rsp)
+        lea       _ones(%rip), %rax
+        fldt      (%rsp)
+        movb      89(%rsp), %dl
+        andb      $-128, %dl
+        fldl      (%rax)
+        fmul      %st, %st(1)
+        fxch      %st(1)
+        fstpt     32(%rsp)
+        fmulp     %st, %st(1)
+        movb      41(%rsp), %cl
+        andb      $127, %cl
+        orb       %dl, %cl
+        fstpt     16(%rsp)
+        testb     %sil, %sil
+        movb      %cl, 41(%rsp)
+        je        ..B1.9
+..B1.8:
+        fldcw     50(%rsp)
+..B1.9:
+        fldt      32(%rsp)
+        addq      $56, %rsp
+	.cfi_def_cfa_offset 8
+        ret       
+        .align    16,0x90
+	.cfi_endproc
+	.type	copysignl,@function
+	.size	copysignl,.-copysignl
+	.data
+# -- End  copysignl
+	.section .rodata, "a"
+	.align 4
+	.align 4
+_ones:
+	.long	0
+	.long	1072693248
+	.long	0
+	.long	3220176896
+	.type	_ones,@object
+	.size	_ones,16
+	.data
+	.section .note.GNU-stack, ""
+// -- Begin DWARF2 SEGMENT .eh_frame
+	.section .eh_frame,"a",@progbits
+.eh_frame_seg:
+	.align 1
+# End

rs-libc/src/asm/x86_64/fabs.S

@@ -0,0 +1,49 @@
+	.file "fabs.c"
+	.text
+..TXTST0:
+# -- Begin  fabs
+	.text
+       .align    16,0x90
+	.globl fabs
+fabs:
+# parameter 1: %xmm0
+..B1.1:
+	.cfi_startproc
+..___tag_value_fabs.1:
+..L2:
+
+..B1.2:
+        movq      MASK(%rip), %xmm1
+        movq      ONE(%rip), %xmm2
+        andpd     %xmm1, %xmm0
+        mulsd     %xmm2, %xmm0
+        ret       
+..B1.3:
+        .align    16,0x90
+	.cfi_endproc
+	.type	fabs,@function
+	.size	fabs,.-fabs
+	.data
+# -- End  fabs
+	.section .rodata, "a"
+	.align 16
+	.align 16
+MASK:
+	.long	4294967295
+	.long	2147483647
+	.type	MASK,@object
+	.size	MASK,8
+	.space 8, 0x00 	# pad
+	.align 16
+ONE:
+	.long	0
+	.long	1072693248
+	.type	ONE,@object
+	.size	ONE,8
+	.data
+	.section .note.GNU-stack, ""
+// -- Begin DWARF2 SEGMENT .eh_frame
+	.section .eh_frame,"a",@progbits
+.eh_frame_seg:
+	.align 1
+# End