[ARM] Add the option to directly access TLS pointer
This patch enables choice for accessing thread local
storage pointer (like '-mtp' in gcc).
Differential Revision: https://reviews.llvm.org/D34408
llvm-svn: 309381
diff --git a/llvm/test/CodeGen/ARM/readtp.ll b/llvm/test/CodeGen/ARM/readtp.ll
new file mode 100644
index 0000000..01ebf6e
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/readtp.ll
@@ -0,0 +1,22 @@
+; RUN: llc -mtriple=armeb-linux-gnueabihf -O2 -mattr=+read-tp-hard %s -o - | FileCheck %s -check-prefix=CHECK-HARD
+; RUN: llc -mtriple=armeb-linux-gnueabihf -O2 %s -o - | FileCheck %s -check-prefix=CHECK-SOFT
+
+
+; __thread int counter;
+; void foo() {
+; counter = 5;
+; }
+
+
+@counter = thread_local local_unnamed_addr global i32 0, align 4
+
+define void @foo() local_unnamed_addr #0 {
+entry:
+ store i32 5, i32* @counter, align 4
+ ret void
+}
+
+
+; CHECK-LABEL: foo:
+; CHECK-HARD: mrc p15, #0, {{r[0-9]+}}, c13, c0, #3
+; CHECK-SOFT: bl __aeabi_read_tp
\ No newline at end of file