Adds outline atomics support to Rust's compiler-rt build, since this is required
with a sufficiently new version of clang. Support for these hasn't reached a
stable version of LLVM yet, so we need to pick the changes and the corresponding
build logic in.

diff --git a/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S
new file mode 100644
index 000000000..5dc0d5320
--- /dev/null
+++ b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S
@@ -0,0 +1,236 @@
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "assembly.h"
+
+// Out-of-line LSE atomics helpers. Ported from libgcc library.
+// N = {1, 2, 4, 8}
+// M = {1, 2, 4, 8, 16}
+// ORDER = {'relax', 'acq', 'rel', 'acq_rel'}
+// Routines implemented:
+//
+//  iM __aarch64_casM_ORDER(iM expected, iM desired, iM *ptr)
+//  iN __aarch64_swpN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldaddN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldclrN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldeorN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldsetN_ORDER(iN val, iN *ptr)
+//
+// Routines may modify temporary registers tmp0, tmp1, tmp2,
+// return value x0 and the flags only.
+
+#ifdef __aarch64__
+
+#ifdef HAS_ASM_LSE
+.arch armv8-a+lse
+#else
+.arch armv8-a
+#endif
+
+#if !defined(__APPLE__)
+HIDDEN(__aarch64_have_lse_atomics)
+#else
+HIDDEN(___aarch64_have_lse_atomics)
+#endif
+
+// Generate mnemonics for
+// L_cas:                                 SIZE: 1,2,4,8,16 MODEL: 1,2,3,4
+// L_swp L_ldadd L_ldclr L_ldeor L_ldset: SIZE: 1,2,4,8    MODEL: 1,2,3,4
+
+#if SIZE == 1
+#define S b
+#define UXT uxtb
+#define B 0x00000000
+#elif SIZE == 2
+#define S h
+#define UXT uxth
+#define B 0x40000000
+#elif SIZE == 4 || SIZE == 8 || SIZE == 16
+#define S
+#define UXT mov
+#if SIZE == 4
+#define B 0x80000000
+#elif SIZE == 8
+#define B 0xc0000000
+#endif
+#else
+#error
+#endif // SIZE
+
+#if MODEL == 1
+#define SUFF _relax
+#define A
+#define L
+#define M 0x000000
+#define N 0x000000
+#elif MODEL == 2
+#define SUFF _acq
+#define A a
+#define L
+#define M 0x400000
+#define N 0x800000
+#elif MODEL == 3
+#define SUFF _rel
+#define A
+#define L l
+#define M 0x008000
+#define N 0x400000
+#elif MODEL == 4
+#define SUFF _acq_rel
+#define A a
+#define L l
+#define M 0x408000
+#define N 0xc00000
+#else
+#error
+#endif // MODEL
+
+// Define register size.
+#define x(N) GLUE2(x, N)
+#define w(N) GLUE2(w, N)
+#if SIZE < 8
+#define s(N) w(N)
+#else
+#define s(N) x(N)
+#endif
+
+#define NAME(BASE) GLUE4(__aarch64_, BASE, SIZE, SUFF)
+#define LDXR GLUE4(ld, A, xr, S)
+#define STXR GLUE4(st, L, xr, S)
+
+// Define temporary registers.
+#define tmp0 16
+#define tmp1 17
+#define tmp2 15
+
+// Macro for branch to label if no LSE available
+.macro JUMP_IF_NOT_LSE label
+#if !defined(__APPLE__)
+        adrp    x(tmp0), __aarch64_have_lse_atomics
+        ldrb    w(tmp0), [x(tmp0), :lo12:__aarch64_have_lse_atomics]
+#else
+        adrp    x(tmp0), ___aarch64_have_lse_atomics@page
+        ldrb    w(tmp0), [x(tmp0), ___aarch64_have_lse_atomics@pageoff]
+#endif
+        cbz     w(tmp0), \label
+.endm
+
+#ifdef L_cas
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(cas))
+        JUMP_IF_NOT_LSE 8f
+#if SIZE < 16
+#ifdef HAS_ASM_LSE
+#define CAS GLUE4(cas, A, L, S) s(0), s(1), [x2]
+#else
+#define CAS .inst 0x08a07c41 + B + M
+#endif
+        CAS    // s(0), s(1), [x2]
+        ret
+8:
+        UXT    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x2]
+        cmp    s(0), s(tmp0)
+        bne    1f
+        STXR   w(tmp1), s(1), [x2]
+        cbnz   w(tmp1), 0b
+1:
+        ret
+#else
+#define LDXP GLUE3(ld, A, xp)
+#define STXP GLUE3(st, L, xp)
+#ifdef HAS_ASM_LSE
+#define CASP GLUE3(casp, A, L)  x0, x1, x2, x3, [x4]
+#else
+#define CASP .inst 0x48207c82 + M
+#endif
+
+        CASP   // x0, x1, x2, x3, [x4]
+        ret
+8:
+        mov    x(tmp0), x0
+        mov    x(tmp1), x1
+0:
+        LDXP   x0, x1, [x4]
+        cmp    x0, x(tmp0)
+        ccmp   x1, x(tmp1), #0, eq
+        bne    1f
+        STXP   w(tmp2), x2, x3, [x4]
+        cbnz   w(tmp2), 0b
+1:
+        ret
+#endif
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(cas))
+#endif // L_cas
+
+#ifdef L_swp
+#ifdef HAS_ASM_LSE
+#define SWP GLUE4(swp, A, L, S)  s(0), s(0), [x1]
+#else
+#define SWP .inst 0x38208020 + B + N
+#endif
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(swp))
+        JUMP_IF_NOT_LSE 8f
+        SWP    // s(0), s(0), [x1]
+        ret
+8:
+        mov    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x1]
+        STXR   w(tmp1), s(tmp0), [x1]
+        cbnz   w(tmp1), 0b
+        ret
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(swp))
+#endif // L_swp
+
+#if defined(L_ldadd) || defined(L_ldclr) ||                                    \
+    defined(L_ldeor) || defined(L_ldset)
+
+#ifdef L_ldadd
+#define LDNM ldadd
+#define OP add
+#define OPN 0x0000
+#elif defined(L_ldclr)
+#define LDNM ldclr
+#define OP bic
+#define OPN 0x1000
+#elif defined(L_ldeor)
+#define LDNM ldeor
+#define OP eor
+#define OPN 0x2000
+#elif defined(L_ldset)
+#define LDNM ldset
+#define OP orr
+#define OPN 0x3000
+#else
+#error
+#endif
+
+#ifdef HAS_ASM_LSE
+#define LDOP GLUE4(LDNM, A, L, S) s(0), s(0), [x1]
+#else
+#define LDOP .inst 0x38200020 + OPN + B + N
+#endif
+
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(LDNM))
+        JUMP_IF_NOT_LSE 8f
+        LDOP // s(0), s(0), [x1]
+        ret
+8:
+        mov    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x1]
+        OP     s(tmp1), s(0), s(tmp0)
+        STXR   w(tmp2), s(tmp1), [x1]
+        cbnz   w(tmp2), 0b
+        ret
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(LDNM))
+#endif // L_ldadd L_ldclr L_ldeor L_ldset
+
+NO_EXEC_STACK_DIRECTIVE
+
+// GNU property note for BTI and PAC
+GNU_PROPERTY_BTI_PAC
+
+#endif // __aarch64__
diff --git a/src/llvm-project/compiler-rt/lib/builtins/assembly.h b/src/llvm-project/compiler-rt/lib/builtins/assembly.h
index f437cb87f..f6ce6a9fc 100644
--- a/src/llvm-project/compiler-rt/lib/builtins/assembly.h
+++ b/src/llvm-project/compiler-rt/lib/builtins/assembly.h
@@ -14,8 +14,8 @@
 #ifndef COMPILERRT_ASSEMBLY_H
 #define COMPILERRT_ASSEMBLY_H
 
-#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
-#define SEPARATOR @
+#if defined(__APPLE__) && defined(__aarch64__)
+#define SEPARATOR %%
 #else
 #define SEPARATOR ;
 #endif
@@ -35,14 +35,14 @@
 #define HIDDEN(name) .hidden name
 #define LOCAL_LABEL(name) .L_##name
 #define FILE_LEVEL_DIRECTIVE
-#if defined(__arm__)
+#if defined(__arm__) || defined(__aarch64__)
 #define SYMBOL_IS_FUNC(name) .type name,%function
 #else
 #define SYMBOL_IS_FUNC(name) .type name,@function
 #endif
 #define CONST_SECTION .section .rodata
 
-#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
+#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) ||        \
     defined(__linux__)
 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
 #else
@@ -65,6 +65,66 @@
 
 #endif
 
+#if defined(__arm__) || defined(__aarch64__)
+#define FUNC_ALIGN                                                             \
+  .text SEPARATOR                                                              \
+  .balign 16 SEPARATOR
+#else
+#define FUNC_ALIGN
+#endif
+
+// BTI and PAC gnu property note
+#define NT_GNU_PROPERTY_TYPE_0 5
+#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
+#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 1
+#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 2
+
+#if defined(__ARM_FEATURE_BTI_DEFAULT)
+#define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI
+#else
+#define BTI_FLAG 0
+#endif
+
+#if __ARM_FEATURE_PAC_DEFAULT & 3
+#define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC
+#else
+#define PAC_FLAG 0
+#endif
+
+#define GNU_PROPERTY(type, value)                                              \
+  .pushsection .note.gnu.property, "a" SEPARATOR                               \
+  .p2align 3 SEPARATOR                                                         \
+  .word 4 SEPARATOR                                                            \
+  .word 16 SEPARATOR                                                           \
+  .word NT_GNU_PROPERTY_TYPE_0 SEPARATOR                                       \
+  .asciz "GNU" SEPARATOR                                                       \
+  .word type SEPARATOR                                                         \
+  .word 4 SEPARATOR                                                            \
+  .word value SEPARATOR                                                        \
+  .word 0 SEPARATOR                                                            \
+  .popsection
+
+#if BTI_FLAG != 0
+#define BTI_C bti c
+#else
+#define BTI_C
+#endif
+
+#if (BTI_FLAG | PAC_FLAG) != 0
+#define GNU_PROPERTY_BTI_PAC                                                   \
+  GNU_PROPERTY(GNU_PROPERTY_AARCH64_FEATURE_1_AND, BTI_FLAG | PAC_FLAG)
+#else
+#define GNU_PROPERTY_BTI_PAC
+#endif
+
+#if defined(__clang__) || defined(__GCC_HAVE_DWARF2_CFI_ASM)
+#define CFI_START .cfi_startproc
+#define CFI_END .cfi_endproc
+#else
+#define CFI_START
+#define CFI_END
+#endif
+
 #if defined(__arm__)
 
 // Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
@@ -131,8 +191,14 @@
 #define DEFINE_CODE_STATE
 #endif
 
-#define GLUE2(a, b) a##b
-#define GLUE(a, b) GLUE2(a, b)
+#define GLUE2_(a, b) a##b
+#define GLUE(a, b) GLUE2_(a, b)
+#define GLUE2(a, b) GLUE2_(a, b)
+#define GLUE3_(a, b, c) a##b##c
+#define GLUE3(a, b, c) GLUE3_(a, b, c)
+#define GLUE4_(a, b, c, d) a##b##c##d
+#define GLUE4(a, b, c, d) GLUE4_(a, b, c, d)
+
 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
 
 #ifdef VISIBILITY_HIDDEN
@@ -177,6 +243,16 @@
   DECLARE_FUNC_ENCODING                                                        \
   name:
 
+#define DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(name)                     \
+  DEFINE_CODE_STATE                                                            \
+  FUNC_ALIGN                                                                   \
+  .globl name SEPARATOR                                                        \
+  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
+  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
+  CFI_START SEPARATOR                                                          \
+  DECLARE_FUNC_ENCODING                                                        \
+  name: SEPARATOR BTI_C
+
 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
   .globl SYMBOL_NAME(name) SEPARATOR                                           \
   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
@@ -193,8 +269,13 @@
 #ifdef __ELF__
 #define END_COMPILERRT_FUNCTION(name)                                          \
   .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
+#define END_COMPILERRT_OUTLINE_FUNCTION(name)                                  \
+  CFI_END SEPARATOR                                                            \
+  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
 #else
 #define END_COMPILERRT_FUNCTION(name)
+#define END_COMPILERRT_OUTLINE_FUNCTION(name)                                  \
+  CFI_END
 #endif
 
 #endif // COMPILERRT_ASSEMBLY_H
diff --git a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
index 468bcc84c..1f72d800f 100644
--- a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
+++ b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
@@ -12,6 +12,16 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(HAVE_INIT_PRIORITY)
+#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101))
+#elif __has_attribute(__constructor__)
+#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__))
+#else
+// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that
+// this runs during initialization.
+#define CONSTRUCTOR_ATTRIBUTE
+#endif
+
 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) ||           \
      defined(_M_X64)) &&                                                       \
     (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER))
@@ -656,16 +666,6 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf,
 #undef setFeature
 }
 
-#if defined(HAVE_INIT_PRIORITY)
-#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101))
-#elif __has_attribute(__constructor__)
-#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__))
-#else
-// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that
-// this runs during initialization.
-#define CONSTRUCTOR_ATTRIBUTE
-#endif
-
 #ifndef _WIN32
 __attribute__((visibility("hidden")))
 #endif
@@ -741,4 +741,24 @@ int CONSTRUCTOR_ATTRIBUTE __cpu_indicator_init(void) {
   return 0;
 }
 
+#elif defined(__aarch64__)
+// LSE support detection for out-of-line atomics
+// using HWCAP and Auxiliary vector
+_Bool __aarch64_have_lse_atomics
+    __attribute__((visibility("hidden"), nocommon));
+#if defined(__has_include)
+#if __has_include(<sys/auxv.h>)
+#include <sys/auxv.h>
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+#ifndef HWCAP_ATOMICS
+#define HWCAP_ATOMICS (1 << 8)
+#endif
+static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
+  unsigned long hwcap = getauxval(AT_HWCAP);
+  __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
+}
+#endif // defined(__has_include)
+#endif // __has_include(<sys/auxv.h>)
 #endif
diff --git a/vendor/compiler_builtins/.cargo-checksum.json b/vendor/compiler_builtins/.cargo-checksum.json
index b14e1309a..1f82d1de1 100644
--- a/vendor/compiler_builtins/.cargo-checksum.json
+++ b/vendor/compiler_builtins/.cargo-checksum.json
@@ -1 +1 @@
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39239721b1","Cargo.lock":"1dfa9c1f68c8e0f1d1fc90ed0712a3eeb2ea68478064c19d601249f60acde4a1","libm/src/math/sinhf.rs":"d06eb030ba9dbf7094df127262bfe99f149b4db49fa8ab8c15499660f1e46b26","src/x86.rs":"068e456417d4740f048800da1d18eb49dd85f85604e5e383446331925e1effc3","libm/src/math/erf.rs":"9c55fc6756ba816996f0b585e07ccfa4cd87575ad525cd30c4a968b30acffda3","libm/src/math/log1pf.rs":"2716e6d2afa271996b7c8f47fd9e4952c88f4c1fd8c07c3e8ce8c62794bf71d8","libm/src/math/ilogb.rs":"813413bf6266d4fc40db9c5921af3cef4f892ba93e8f6d9efe62a449d1234532","libm/src/math/fminf.rs":"304bc839b15ea3d84e68d2af9f40524ec120d30a36a667b22fcb98a6c258f4c7","src/macros.rs":"9f3aa9b66195b258ff29209c6b1e7962d6f82d31579d669dd74c9fdeee134170","src/probestack.rs":"c1ad1e4a9550a3507bcbec00c8917530a954ba971c02506aeec949381443674a","libm/src/math/j0f.rs":"802c8254bded9b3afb6eea8b9af240038a5a4a5d811396729f69ca509e3e7d87","libm/src/math/log1p.rs":"9cf400852f165e6be19b97036ae9521fb9ca857d0a9a91c117d9123221622185","libm/src/math/scalbn.rs":"b5c9d6d4177fe393cbfe1c634d75ce14b754f6cbce87c5bf979a9661491748a2","libm/src/math/cosf.rs":"09c40f93c445b741e22477ceedf163ca33b6a47f973f7c9876cfba2692edb29c","libm/src/math/lgammaf.rs":"457105f53a4c8717e8f5a117d261dcf94e222e83981337fe23602abe883fe3f7","libm/src/math/sincos.rs":"59e9f196140681fa817652134b8d1bdd2d6dd47bb8557b0346c77b176389f883","libm/src/math/ceil.rs":"0e6caff1597818471c28b7c3226dbfe9976fdb38ace5246172ac030754be6b79","libm/src/math/fmaf.rs":"3e0f5727e56f31218f674b9b8975d7e67b3a24a097f06a2a3eca9723cd786213","src/int/addsub.rs":"9e7a393c76958fe9e8fb7de9bfe1304766c276bfdaa25761913357e0f6172369","src/float/cmp.rs":"a86ccbc0e56f07ba439dc6a4fd835184645178c0a6da625bd4ae24ecf9a790f8","libm/src/math/asinh.rs":"e8fc94031015fddf35e9c26b94da9f6431ee17c81cd7bd37da8ffc98f7e0b32c","libm/src/math/jnf.rs":"4045076f7d1a1b89882ed60d4dd60a4cbbc66b85cfb90491378c8015effcc476","libm/src/math/log10.rs":"3425ff8be001fd1646ba15e254eb6ef4bdc6ccaf0cbee27ddf1fa84e04178b90","libm/src/math/log2f.rs":"92a90350d8edce21c31c285c3e620fca7c62a2366008921715945c2c73b5b79f","libm/src/math/fmax.rs":"f6c8e96a8b1a170648d2fa3513e7b6b459085d708c839869f82e305fe58fac37","libm/src/math/fdim.rs":"8ec091996005207297c2389ae563e1b18dbc6a9eac951de29a976c5cd7bc32a7","libm/src/math/exp2f.rs":"785f2630accd35118ec07bf60273e219ed91a215b956b1552eeea5bc2a708cc8","src/mem.rs":"4ece60ca07aaff3611a716a80f55668a785ad8399b65fc36cc9ab4b481fa639c","libm/src/math/fdimf.rs":"c7f3f2269834d55be26b6580ddc07c42531577955fa4de35bad1e2a361085614","libm/src/math/lgammaf_r.rs":"44de75babbdd53c4a5879cd6f426e7311db82669def39df5f63914d67d6cc1b1","libm/src/math/powf.rs":"2c423a0ea57fdc4e20f3533f744c6e6288c998b4de8f2914fafaa0e78be81b04","src/int/mod.rs":"d15781df9dc054aa11e23f4825152ae9c609aab15bf43599ff07ff683f513643","libm/src/math/copysign.rs":"d80c880efaf0cdf2ce0a4d4f5a68dd6c36c88d46fa997ec8ac8604bfdb26fa33","src/float/pow.rs":"64f4935f4bed46d3b9cde4d16f59cca76a110d36d02d76f4b909157349edf5e3","libm/src/math/modf.rs":"d012ed5a708ef52b6d1313c22a46cadaf5764dde1220816e3df2f03a0fcc60ae","libm/src/math/fmaxf.rs":"dff0025433232e8a5ec7bd54d847ccf596d762ea4e35f5c54fbaac9404d732fd","build.rs":"a47b5ed5c7d2a6f2fbc3e9803a8d4f75839db9ac03aa4fab72932d899ecb590f","libm/src/math/log10f.rs":"fee4f71879bc4c99259e68c0c641364901629fb29a8ebddfcc0d090102cceddd","libm/src/math/jn.rs":"847d122334e5707ad9627146cddccc082a1f2f5bcd3e5ef54399013a7007ce88"},"package":"7bc4ac2c824d2bfc612cba57708198547e9a26943af0632aff033e0693074d5c"}
\ No newline at end of file
diff --git a/vendor/compiler_builtins/build.rs b/vendor/compiler_builtins/build.rs
index abeac9bf1..c57802569 100644
--- a/vendor/compiler_builtins/build.rs
+++ b/vendor/compiler_builtins/build.rs
@@ -81,7 +81,7 @@ mod c {
 
     use std::collections::BTreeMap;
     use std::env;
-    use std::path::PathBuf;
+    use std::path::{Path, PathBuf};
 
     struct Sources {
         // SYMBOL -> PATH TO SOURCE
@@ -419,6 +419,37 @@ mod c {
             if target_os != "windows" {
                 sources.extend(&[("__multc3", "multc3.c")]);
             }
+
+            if target_env == "musl" {
+                sources.extend(&[
+                    ("__addtf3", "addtf3.c"),
+                    ("__multf3", "multf3.c"),
+                    ("__subtf3", "subtf3.c"),
+                    ("__divtf3", "divtf3.c"),
+                    ("__powitf2", "powitf2.c"),
+                    ("__fe_getround", "fp_mode.c"),
+                    ("__fe_raise_inexact", "fp_mode.c"),
+                ]);
+            }
+        }
+
+        if target_arch == "mips" {
+            sources.extend(&[("__bswapsi2", "bswapsi2.c")]);
+        }
+
+        if target_arch == "mips64" {
+            sources.extend(&[
+                ("__extenddftf2", "extenddftf2.c"),
+                ("__netf2", "comparetf2.c"),
+                ("__addtf3", "addtf3.c"),
+                ("__multf3", "multf3.c"),
+                ("__subtf3", "subtf3.c"),
+                ("__fixtfsi", "fixtfsi.c"),
+                ("__floatsitf", "floatsitf.c"),
+                ("__fixunstfsi", "fixunstfsi.c"),
+                ("__floatunsitf", "floatunsitf.c"),
+                ("__fe_getround", "fp_mode.c"),
+            ]);
         }
 
         // Remove the assembly implementations that won't compile for the target
@@ -456,7 +487,20 @@ mod c {
         // use of that macro in lib/builtins/int_util.h in compiler-rt.
         cfg.flag_if_supported(&format!("-ffile-prefix-map={}=.", root.display()));
 
+        // Include out-of-line atomics for aarch64, which are all generated by supplying different
+        // sets of flags to the same source file.
         let src_dir = root.join("lib/builtins");
+        if target_arch == "aarch64" {
+            let atomics_libs = build_aarch64_out_of_line_atomics_libraries(&src_dir, cfg);
+            if !atomics_libs.is_empty() {
+                for library in  atomics_libs {
+                    cfg.object(library);
+                }
+                // Some run-time CPU feature detection is necessary, as well.
+                sources.extend(&[("__aarch64_have_lse_atomics", "cpu_model.c")]);
+            }
+        }
+
         for (sym, src) in sources.map.iter() {
             let src = src_dir.join(src);
             cfg.file(&src);
@@ -466,4 +510,60 @@ mod c {
 
         cfg.compile("libcompiler-rt.a");
     }
+
+    fn build_aarch64_out_of_line_atomics_libraries(
+        builtins_dir: &Path,
+        cfg: &cc::Build,
+    ) -> Vec<PathBuf> {
+        // NOTE: because we're recompiling the same source file in N different ways, building
+        // serially is necessary. If we want to lift this restriction, we can either:
+        // - create symlinks to lse.S and build those_(though we'd still need to pass special
+        //   #define-like flags to each of these), or
+        // - synthesizing tiny .S files in out/ with the proper #defines, which ultimately #include
+        //   lse.S.
+        // That said, it's unclear how useful this added complexity will be, so just do the simple
+        // thing for now.
+        let outlined_atomics_file = builtins_dir.join("aarch64/lse.S");
+
+        // A stable release hasn't been made with lse.S yet. Until we pick that up, do nothing.
+        if !outlined_atomics_file.exists() {
+            return vec![];
+        }
+
+        println!("cargo:rerun-if-changed={}", outlined_atomics_file.display());
+        let out_dir: PathBuf = env::var("OUT_DIR").unwrap().into();
+
+        // Ideally, this would be a Vec of object files, but cc doesn't make it *entirely*
+        // trivial to build an individual object.
+        let mut atomics_libraries = Vec::new();
+        for instruction_type in &["cas", "cwp", "ldadd", "ldclr", "ldeor", "ldset"] {
+            for size in &[1, 2, 4, 8, 16] {
+                if *size == 16 && *instruction_type != "cas" {
+                    continue;
+                }
+
+                for (model_number, model_name) in
+                    &[(1, "relax"), (2, "acq"), (3, "rel"), (4, "acq_rel")]
+                {
+                    let library_name = format!(
+                        "liboutline_atomic_helper_{}_{}_{}.a",
+                        instruction_type, size, model_name
+                    );
+                    let sym = format!("__aarch64_{}{}_{}", instruction_type, size, model_name);
+                    let mut cfg = cfg.clone();
+
+                    cfg.include(&builtins_dir)
+                        .define(&format!("L_{}", instruction_type), None)
+                        .define("SIZE", size.to_string().as_str())
+                        .define("MODEL", model_number.to_string().as_str())
+                        .file(&outlined_atomics_file);
+                    cfg.compile(&library_name);
+
+                    atomics_libraries.push(out_dir.join(library_name));
+                    println!("cargo:rustc-cfg={}=\"optimized-c\"", sym);
+                }
+            }
+        }
+        atomics_libraries
+    }
 }