[AArch64] Support adding X[8-15,18] registers as CSRs.

Summary:
Making X[8-15,18] registers call-saved is used to support
CONFIG_ARM64_LSE_ATOMICS in Linux kernel.

Signed-off-by: Tri Vo <trong@android.com>

Reviewers: srhines, nickdesaulniers, javed.absar

Reviewed By: nickdesaulniers

Subscribers: kristof.beyls, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D52399

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342990 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/Driver/ToolChains/Arch/AArch64.cpp b/lib/Driver/ToolChains/Arch/AArch64.cpp
index 9488f4d6c0..c76a31a315 100644
--- a/lib/Driver/ToolChains/Arch/AArch64.cpp
+++ b/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -251,6 +251,33 @@ fp16_fml_fallthrough:
   if (Args.hasArg(options::OPT_ffixed_x20))
     Features.push_back("+reserve-x20");
 
+  if (Args.hasArg(options::OPT_fcall_saved_x8))
+    Features.push_back("+call-saved-x8");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x9))
+    Features.push_back("+call-saved-x9");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x10))
+    Features.push_back("+call-saved-x10");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x11))
+    Features.push_back("+call-saved-x11");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x12))
+    Features.push_back("+call-saved-x12");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x13))
+    Features.push_back("+call-saved-x13");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x14))
+    Features.push_back("+call-saved-x14");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x15))
+    Features.push_back("+call-saved-x15");
+
+  if (Args.hasArg(options::OPT_fcall_saved_x18))
+    Features.push_back("+call-saved-x18");
+
   if (Args.hasArg(options::OPT_mno_neg_immediates))
     Features.push_back("+no-neg-immediates");
 }