Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/mpn/arm/rshift.asm b/third_party/gmp/mpn/arm/rshift.asm
new file mode 100644
index 0000000..9ddbc2e
--- /dev/null
+++ b/third_party/gmp/mpn/arm/rshift.asm
@@ -0,0 +1,86 @@
+dnl ARM mpn_rshift.
+
+dnl Contributed to the GNU project by Torbjörn Granlund.
+
+dnl Copyright 1997, 2000, 2001, 2012 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of either:
+dnl
+dnl * the GNU Lesser General Public License as published by the Free
+dnl Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl or
+dnl
+dnl * the GNU General Public License as published by the Free Software
+dnl Foundation; either version 2 of the License, or (at your option) any
+dnl later version.
+dnl
+dnl or both in parallel, as here.
+dnl
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+dnl for more details.
+dnl
+dnl You should have received copies of the GNU General Public License and the
+dnl GNU Lesser General Public License along with the GNU MP Library. If not,
+dnl see https://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+C cycles/limb
+C StrongARM ?
+C XScale ?
+C Cortex-A7 ?
+C Cortex-A8 ?
+C Cortex-A9 3.5
+C Cortex-A15 ?
+
+define(`rp', `r0')
+define(`up', `r1')
+define(`n', `r2')
+define(`cnt', `r3')
+define(`tnc', `r12')
+
+ASM_START()
+PROLOGUE(mpn_rshift)
+ push {r4, r6, r7, r8}
+ ldr r4, [up]
+ rsb tnc, cnt, #32
+
+ mov r7, r4, lsr cnt
+ tst n, #1
+ beq L(evn) C n even
+
+L(odd): subs n, n, #2
+ bcc L(1) C n = 1
+ ldr r8, [up, #4]!
+ b L(mid)
+
+L(evn): ldr r6, [up, #4]!
+ subs n, n, #2
+ beq L(end)
+
+L(top): ldr r8, [up, #4]!
+ orr r7, r7, r6, lsl tnc
+ str r7, [rp], #4
+ mov r7, r6, lsr cnt
+L(mid): ldr r6, [up, #4]!
+ orr r7, r7, r8, lsl tnc
+ str r7, [rp], #4
+ mov r7, r8, lsr cnt
+ subs n, n, #2
+ bgt L(top)
+
+L(end): orr r7, r7, r6, lsl tnc
+ str r7, [rp], #4
+ mov r7, r6, lsr cnt
+L(1): str r7, [rp]
+ mov r0, r4, lsl tnc
+ pop {r4, r6, r7, r8}
+ return r14
+EPILOGUE()