Fix an obvious typo which caused an isel assertion. rdar://8964854.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125023 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 59a71553bfdf333236d838d87b7438817177c237..4afc8c7fac78d416fe548c03425bb679a0c2f5af 100644 (file)
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -4344,7 +4344,7 @@ ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
   default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
   case 1:
     ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
-    strOpc = isThumb2 ? ARM::t2LDREXB : ARM::STREXB;
+    strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
     break;
   case 2:
     ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;

diff --git a/test/CodeGen/ARM/atomic-cmp.ll b/test/CodeGen/ARM/atomic-cmp.ll
new file mode 100644 (file)
index 0000000..f31aa7b
--- /dev/null
+++ b/test/CodeGen/ARM/atomic-cmp.ll
@@ -0,0 +1,17 @@
+; RUN: llc < %s -mtriple=armv7-apple-darwin   | FileCheck %s -check-prefix=ARM
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s -check-prefix=T2
+; rdar://8964854
+
+define i8 @t(i8* %a, i8 %b, i8 %c) nounwind {
+; ARM: t:
+; ARM: ldrexb
+; ARM: strexb
+
+; T2: t:
+; T2: ldrexb
+; T2: strexb
+  %tmp0 = tail call i8 @llvm.atomic.cmp.swap.i8.p0i8(i8* %a, i8 %b, i8 %c)
+  ret i8 %tmp0
+}
+
+declare i8 @llvm.atomic.cmp.swap.i8.p0i8(i8* nocapture, i8, i8) nounwind