Atomics: promote ARM's IR-based atomics pass to CodeGen.

Still only 32-bit ARM using it at this stage, but the promotion allows
direct testing via opt and is a reasonably self-contained patch on the
way to switching ARM64.

At this point, other targets should be able to make use of it without
too much difficulty if they want. (See ARM64 commit coming soon for an
example).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206485 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 546 insertions, 0 deletions

diff --git a/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll b/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll
new file mode 100644
index 0000000000..ac9fc1f586
--- /dev/null
+++ b/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll
@@ -0,0 +1,340 @@
+; RUN: opt -S -o - -mtriple=armv7-apple-ios7.0 -atomic-ll-sc %s | FileCheck %s
+
+define i8 @test_atomic_xchg_i8(i8* %ptr, i8 %xchgend) {
+; CHECK-LABEL: @test_atomic_xchg_i8
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[NEWVAL32:%.*]] = zext i8 %xchgend to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw xchg i8* %ptr, i8 %xchgend monotonic
+  ret i8 %res
+}
+
+define i16 @test_atomic_add_i16(i16* %ptr, i16 %addend) {
+; CHECK-LABEL: @test_atomic_add_i16
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i16(i16* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i16
+; CHECK: [[NEWVAL:%.*]] = add i16 [[OLDVAL]], %addend
+; CHECK: [[NEWVAL32:%.*]] = zext i16 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i16(i32 [[NEWVAL32]], i16* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i16 [[OLDVAL]]
+  %res = atomicrmw add i16* %ptr, i16 %addend seq_cst
+  ret i16 %res
+}
+
+define i32 @test_atomic_sub_i32(i32* %ptr, i32 %subend) {
+; CHECK-LABEL: @test_atomic_sub_i32
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL:%.*]] = call i32 @llvm.arm.ldrex.p0i32(i32* %ptr)
+; CHECK: [[NEWVAL:%.*]] = sub i32 [[OLDVAL]], %subend
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i32(i32 [[NEWVAL]], i32* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence acquire
+; CHECK: ret i32 [[OLDVAL]]
+  %res = atomicrmw sub i32* %ptr, i32 %subend acquire
+  ret i32 %res
+}
+
+define i8 @test_atomic_and_i8(i8* %ptr, i8 %andend) {
+; CHECK-LABEL: @test_atomic_and_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[NEWVAL:%.*]] = and i8 [[OLDVAL]], %andend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw and i8* %ptr, i8 %andend release
+  ret i8 %res
+}
+
+define i16 @test_atomic_nand_i16(i16* %ptr, i16 %nandend) {
+; CHECK-LABEL: @test_atomic_nand_i16
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i16(i16* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i16
+; CHECK: [[NEWVAL_TMP:%.*]] = xor i16 %nandend, -1
+; CHECK: [[NEWVAL:%.*]] = and i16 [[OLDVAL]], [[NEWVAL_TMP]]
+; CHECK: [[NEWVAL32:%.*]] = zext i16 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i16(i32 [[NEWVAL32]], i16* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i16 [[OLDVAL]]
+  %res = atomicrmw nand i16* %ptr, i16 %nandend seq_cst
+  ret i16 %res
+}
+
+define i64 @test_atomic_or_i64(i64* %ptr, i64 %orend) {
+; CHECK-LABEL: @test_atomic_or_i64
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[LOHI:%.*]] = call { i32, i32 } @llvm.arm.ldrexd(i8* [[PTR8]])
+; CHECK: [[LO:%.*]] = extractvalue { i32, i32 } [[LOHI]], 0
+; CHECK: [[HI:%.*]] = extractvalue { i32, i32 } [[LOHI]], 1
+; CHECK: [[LO64:%.*]] = zext i32 [[LO]] to i64
+; CHECK: [[HI64_TMP:%.*]] = zext i32 [[HI]] to i64
+; CHECK: [[HI64:%.*]] = shl i64 [[HI64_TMP]], 32
+; CHECK: [[OLDVAL:%.*]] = or i64 [[LO64]], [[HI64]]
+; CHECK: [[NEWVAL:%.*]] = or i64 [[OLDVAL]], %orend
+; CHECK: [[NEWLO:%.*]] = trunc i64 [[NEWVAL]] to i32
+; CHECK: [[NEWHI_TMP:%.*]] = lshr i64 [[NEWVAL]], 32
+; CHECK: [[NEWHI:%.*]] = trunc i64 [[NEWHI_TMP]] to i32
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strexd(i32 [[NEWLO]], i32 [[NEWHI]], i8* [[PTR8]])
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i64 [[OLDVAL]]
+  %res = atomicrmw or i64* %ptr, i64 %orend seq_cst
+  ret i64 %res
+}
+
+define i8 @test_atomic_xor_i8(i8* %ptr, i8 %xorend) {
+; CHECK-LABEL: @test_atomic_xor_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[NEWVAL:%.*]] = xor i8 [[OLDVAL]], %xorend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw xor i8* %ptr, i8 %xorend seq_cst
+  ret i8 %res
+}
+
+define i8 @test_atomic_max_i8(i8* %ptr, i8 %maxend) {
+; CHECK-LABEL: @test_atomic_max_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[WANT_OLD:%.*]] = icmp sgt i8 [[OLDVAL]], %maxend
+; CHECK: [[NEWVAL:%.*]] = select i1 [[WANT_OLD]], i8 [[OLDVAL]], i8 %maxend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw max i8* %ptr, i8 %maxend seq_cst
+  ret i8 %res
+}
+
+define i8 @test_atomic_min_i8(i8* %ptr, i8 %minend) {
+; CHECK-LABEL: @test_atomic_min_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[WANT_OLD:%.*]] = icmp sle i8 [[OLDVAL]], %minend
+; CHECK: [[NEWVAL:%.*]] = select i1 [[WANT_OLD]], i8 [[OLDVAL]], i8 %minend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw min i8* %ptr, i8 %minend seq_cst
+  ret i8 %res
+}
+
+define i8 @test_atomic_umax_i8(i8* %ptr, i8 %umaxend) {
+; CHECK-LABEL: @test_atomic_umax_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[WANT_OLD:%.*]] = icmp ugt i8 [[OLDVAL]], %umaxend
+; CHECK: [[NEWVAL:%.*]] = select i1 [[WANT_OLD]], i8 [[OLDVAL]], i8 %umaxend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw umax i8* %ptr, i8 %umaxend seq_cst
+  ret i8 %res
+}
+
+define i8 @test_atomic_umin_i8(i8* %ptr, i8 %uminend) {
+; CHECK-LABEL: @test_atomic_umin_i8
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[WANT_OLD:%.*]] = icmp ule i8 [[OLDVAL]], %uminend
+; CHECK: [[NEWVAL:%.*]] = select i1 [[WANT_OLD]], i8 [[OLDVAL]], i8 %uminend
+; CHECK: [[NEWVAL32:%.*]] = zext i8 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK: fence seq_cst
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw umin i8* %ptr, i8 %uminend seq_cst
+  ret i8 %res
+}
+
+define i8 @test_cmpxchg_i8_seqcst_seqcst(i8* %ptr, i8 %desired, i8 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i8_seqcst_seqcst
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 %1 to i8
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i8 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[BARRIER:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWVAL32:%.*]] = zext i8 %newval to i32
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK: fence seq_cst
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i8 [[OLDVAL]]
+
+  %old = cmpxchg i8* %ptr, i8 %desired, i8 %newval seq_cst seq_cst
+  ret i8 %old
+}
+
+define i16 @test_cmpxchg_i16_seqcst_monotonic(i16* %ptr, i16 %desired, i16 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i16_seqcst_monotonic
+; CHECK: fence release
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i16(i16* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 %1 to i16
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i16 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWVAL32:%.*]] = zext i16 %newval to i32
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.strex.p0i16(i32 [[NEWVAL32]], i16* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK: fence seq_cst
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i16 [[OLDVAL]]
+
+  %old = cmpxchg i16* %ptr, i16 %desired, i16 %newval seq_cst monotonic
+  ret i16 %old
+}
+
+define i32 @test_cmpxchg_i32_acquire_acquire(i32* %ptr, i32 %desired, i32 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i32_acquire_acquire
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL:%.*]] = call i32 @llvm.arm.ldrex.p0i32(i32* %ptr)
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i32 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.strex.p0i32(i32 %newval, i32* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK: fence acquire
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i32 [[OLDVAL]]
+
+  %old = cmpxchg i32* %ptr, i32 %desired, i32 %newval acquire acquire
+  ret i32 %old
+}
+
+define i64 @test_cmpxchg_i64_monotonic_monotonic(i64* %ptr, i64 %desired, i64 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i64_monotonic_monotonic
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[LOHI:%.*]] = call { i32, i32 } @llvm.arm.ldrexd(i8* [[PTR8]])
+; CHECK: [[LO:%.*]] = extractvalue { i32, i32 } [[LOHI]], 0
+; CHECK: [[HI:%.*]] = extractvalue { i32, i32 } [[LOHI]], 1
+; CHECK: [[LO64:%.*]] = zext i32 [[LO]] to i64
+; CHECK: [[HI64_TMP:%.*]] = zext i32 [[HI]] to i64
+; CHECK: [[HI64:%.*]] = shl i64 [[HI64_TMP]], 32
+; CHECK: [[OLDVAL:%.*]] = or i64 [[LO64]], [[HI64]]
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i64 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWLO:%.*]] = trunc i64 %newval to i32
+; CHECK: [[NEWHI_TMP:%.*]] = lshr i64 %newval, 32
+; CHECK: [[NEWHI:%.*]] = trunc i64 [[NEWHI_TMP]] to i32
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strexd(i32 [[NEWLO]], i32 [[NEWHI]], i8* [[PTR8]])
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK-NOT: fence
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i64 [[OLDVAL]]
+
+  %old = cmpxchg i64* %ptr, i64 %desired, i64 %newval monotonic monotonic
+  ret i64 %old
+}
\ No newline at end of file
diff --git a/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v8.ll b/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v8.ll
new file mode 100644
index 0000000000..bec5befaab
--- /dev/null
+++ b/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v8.ll
@@ -0,0 +1,202 @@
+; RUN: opt -S -o - -mtriple=armv8-linux-gnueabihf -atomic-ll-sc %s | FileCheck %s
+
+define i8 @test_atomic_xchg_i8(i8* %ptr, i8 %xchgend) {
+; CHECK-LABEL: @test_atomic_xchg_i8
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i8
+; CHECK: [[NEWVAL32:%.*]] = zext i8 %xchgend to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i8 [[OLDVAL]]
+  %res = atomicrmw xchg i8* %ptr, i8 %xchgend monotonic
+  ret i8 %res
+}
+
+define i16 @test_atomic_add_i16(i16* %ptr, i16 %addend) {
+; CHECK-LABEL: @test_atomic_add_i16
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldaex.p0i16(i16* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i16
+; CHECK: [[NEWVAL:%.*]] = add i16 [[OLDVAL]], %addend
+; CHECK: [[NEWVAL32:%.*]] = zext i16 [[NEWVAL]] to i32
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.stlex.p0i16(i32 [[NEWVAL32]], i16* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i16 [[OLDVAL]]
+  %res = atomicrmw add i16* %ptr, i16 %addend seq_cst
+  ret i16 %res
+}
+
+define i32 @test_atomic_sub_i32(i32* %ptr, i32 %subend) {
+; CHECK-LABEL: @test_atomic_sub_i32
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL:%.*]] = call i32 @llvm.arm.ldaex.p0i32(i32* %ptr)
+; CHECK: [[NEWVAL:%.*]] = sub i32 [[OLDVAL]], %subend
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i32(i32 [[NEWVAL]], i32* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i32 [[OLDVAL]]
+  %res = atomicrmw sub i32* %ptr, i32 %subend acquire
+  ret i32 %res
+}
+
+define i64 @test_atomic_or_i64(i64* %ptr, i64 %orend) {
+; CHECK-LABEL: @test_atomic_or_i64
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+; CHECK: [[LOOP]]:
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[LOHI:%.*]] = call { i32, i32 } @llvm.arm.ldaexd(i8* [[PTR8]])
+; CHECK: [[LO:%.*]] = extractvalue { i32, i32 } [[LOHI]], 0
+; CHECK: [[HI:%.*]] = extractvalue { i32, i32 } [[LOHI]], 1
+; CHECK: [[LO64:%.*]] = zext i32 [[LO]] to i64
+; CHECK: [[HI64_TMP:%.*]] = zext i32 [[HI]] to i64
+; CHECK: [[HI64:%.*]] = shl i64 [[HI64_TMP]], 32
+; CHECK: [[OLDVAL:%.*]] = or i64 [[LO64]], [[HI64]]
+; CHECK: [[NEWVAL:%.*]] = or i64 [[OLDVAL]], %orend
+; CHECK: [[NEWLO:%.*]] = trunc i64 [[NEWVAL]] to i32
+; CHECK: [[NEWHI_TMP:%.*]] = lshr i64 [[NEWVAL]], 32
+; CHECK: [[NEWHI:%.*]] = trunc i64 [[NEWHI_TMP]] to i32
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.stlexd(i32 [[NEWLO]], i32 [[NEWHI]], i8* [[PTR8]])
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[END:.*]]
+; CHECK: [[END]]:
+; CHECK-NOT: fence
+; CHECK: ret i64 [[OLDVAL]]
+  %res = atomicrmw or i64* %ptr, i64 %orend seq_cst
+  ret i64 %res
+}
+
+define i8 @test_cmpxchg_i8_seqcst_seqcst(i8* %ptr, i8 %desired, i8 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i8_seqcst_seqcst
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldaex.p0i8(i8* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 %1 to i8
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i8 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[BARRIER:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWVAL32:%.*]] = zext i8 %newval to i32
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.stlex.p0i8(i32 [[NEWVAL32]], i8* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK-NOT: fence
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i8 [[OLDVAL]]
+
+  %old = cmpxchg i8* %ptr, i8 %desired, i8 %newval seq_cst seq_cst
+  ret i8 %old
+}
+
+define i16 @test_cmpxchg_i16_seqcst_monotonic(i16* %ptr, i16 %desired, i16 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i16_seqcst_monotonic
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldaex.p0i16(i16* %ptr)
+; CHECK: [[OLDVAL:%.*]] = trunc i32 %1 to i16
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i16 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWVAL32:%.*]] = zext i16 %newval to i32
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.stlex.p0i16(i32 [[NEWVAL32]], i16* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK-NOT: fence
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i16 [[OLDVAL]]
+
+  %old = cmpxchg i16* %ptr, i16 %desired, i16 %newval seq_cst monotonic
+  ret i16 %old
+}
+
+define i32 @test_cmpxchg_i32_acquire_acquire(i32* %ptr, i32 %desired, i32 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i32_acquire_acquire
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[OLDVAL:%.*]] = call i32 @llvm.arm.ldaex.p0i32(i32* %ptr)
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i32 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[TRYAGAIN:%.*]] =  call i32 @llvm.arm.strex.p0i32(i32 %newval, i32* %ptr)
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK-NOT: fence
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i32 [[OLDVAL]]
+
+  %old = cmpxchg i32* %ptr, i32 %desired, i32 %newval acquire acquire
+  ret i32 %old
+}
+
+define i64 @test_cmpxchg_i64_monotonic_monotonic(i64* %ptr, i64 %desired, i64 %newval) {
+; CHECK-LABEL: @test_cmpxchg_i64_monotonic_monotonic
+; CHECK-NOT: fence
+; CHECK: br label %[[LOOP:.*]]
+
+; CHECK: [[LOOP]]:
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[LOHI:%.*]] = call { i32, i32 } @llvm.arm.ldrexd(i8* [[PTR8]])
+; CHECK: [[LO:%.*]] = extractvalue { i32, i32 } [[LOHI]], 0
+; CHECK: [[HI:%.*]] = extractvalue { i32, i32 } [[LOHI]], 1
+; CHECK: [[LO64:%.*]] = zext i32 [[LO]] to i64
+; CHECK: [[HI64_TMP:%.*]] = zext i32 [[HI]] to i64
+; CHECK: [[HI64:%.*]] = shl i64 [[HI64_TMP]], 32
+; CHECK: [[OLDVAL:%.*]] = or i64 [[LO64]], [[HI64]]
+; CHECK: [[SHOULD_STORE:%.*]] = icmp eq i64 [[OLDVAL]], %desired
+; CHECK: br i1 [[SHOULD_STORE]], label %[[TRY_STORE:.*]], label %[[DONE:.*]]
+
+; CHECK: [[TRY_STORE]]:
+; CHECK: [[NEWLO:%.*]] = trunc i64 %newval to i32
+; CHECK: [[NEWHI_TMP:%.*]] = lshr i64 %newval, 32
+; CHECK: [[NEWHI:%.*]] = trunc i64 [[NEWHI_TMP]] to i32
+; CHECK: [[PTR8:%.*]] = bitcast i64* %ptr to i8*
+; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strexd(i32 [[NEWLO]], i32 [[NEWHI]], i8* [[PTR8]])
+; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0
+; CHECK: br i1 [[TST]], label %[[LOOP]], label %[[BARRIER:.*]]
+
+; CHECK: [[BARRIER]]:
+; CHECK-NOT: fence
+; CHECK: br label %[[DONE:.*]]
+
+; CHECK: [[DONE]]:
+; CHECK: ret i64 [[OLDVAL]]
+
+  %old = cmpxchg i64* %ptr, i64 %desired, i64 %newval monotonic monotonic
+  ret i64 %old
+}
\ No newline at end of file
diff --git a/test/Transforms/AtomicExpandLoadLinked/ARM/lit.local.cfg b/test/Transforms/AtomicExpandLoadLinked/ARM/lit.local.cfg
new file mode 100644
index 0000000000..8a3ba96497
--- /dev/null
+++ b/test/Transforms/AtomicExpandLoadLinked/ARM/lit.local.cfg
@@ -0,0 +1,4 @@
+targets = set(config.root.targets_to_build.split())
+if not 'ARM' in targets:
+    config.unsupported = True
+