[Hexagon] Add -ffixed-r19 driver option and translate it to +reserved-r19

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@326366 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 04ed098e8935591c21baa3be294a5469ed40ff24..464956f9fd565f6ebc297e7f4435d604f46ec8f1 100644 (file)
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -2496,6 +2496,8 @@ def mno_hexagon_hvx_double
     : Flag<[ "-" ], "mno-hvx-double">,
       Group<m_hexagon_Features_HVX_Group>,
       HelpText<"Disable Hexagon Double Vector eXtensions">;
+def ffixed_r19: Flag<["-"], "ffixed-r19">,
+  HelpText<"Reserve the r19 register (Hexagon only)">;
 
 
 // X86 feature flags

diff --git a/lib/Driver/ToolChains/Hexagon.cpp b/lib/Driver/ToolChains/Hexagon.cpp
index 31281737c7a1838f90dd3ab308fb7105e84e7282..77193cd0471411256baf9f5cb71b36432b9a1a56 100644 (file)
--- a/lib/Driver/ToolChains/Hexagon.cpp
+++ b/lib/Driver/ToolChains/Hexagon.cpp
@@ -521,11 +521,15 @@ unsigned HexagonToolChain::getOptimizationLevel(
 void HexagonToolChain::addClangTargetOptions(const ArgList &DriverArgs,
                                              ArgStringList &CC1Args,
                                              Action::OffloadKind) const {
-  if (DriverArgs.hasArg(options::OPT_ffp_contract))
-    return;
-  unsigned OptLevel = getOptimizationLevel(DriverArgs);
-  if (OptLevel >= 3)
-    CC1Args.push_back("-ffp-contract=fast");
+  if (!DriverArgs.hasArg(options::OPT_ffp_contract)) {
+    unsigned OptLevel = getOptimizationLevel(DriverArgs);
+    if (OptLevel >= 3)
+      CC1Args.push_back("-ffp-contract=fast");
+  }
+  if (DriverArgs.hasArg(options::OPT_ffixed_r19)) {
+    CC1Args.push_back("-target-feature");
+    CC1Args.push_back("+reserved-r19");
+  }
 }
 
 void HexagonToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,

diff --git a/test/Driver/hexagon-toolchain-elf.c b/test/Driver/hexagon-toolchain-elf.c
index 7dc82f3519981bd3c31714d41694e803c35d70d3..8f4c320ce45b5a08357d2c852e43fab7b28ca489 100644 (file)
--- a/test/Driver/hexagon-toolchain-elf.c
+++ b/test/Driver/hexagon-toolchain-elf.c
@@ -503,6 +503,16 @@
 // CHECK060:      "--noexecstack" "--trap" "--keep-locals"
 // CHECK060-NEXT: hexagon-link
 
+// -----------------------------------------------------------------------------
+// ffixed-r19
+// -----------------------------------------------------------------------------
+// RUN: %clang -### -target hexagon-unknown-elf -ffixed-r19 %s 2>&1 \
+// RUN:        | FileCheck --check-prefix=CHECK070 %s
+// CHECK070: "-target-feature" "+reserved-r19"
+// RUN: %clang -### -target hexagon-unknown-elf %s 2>&1 \
+// RUN:        | FileCheck --check-prefix=CHECK071 %s
+// CHECK071-NOT: "+reserved-r19"
+
 // -----------------------------------------------------------------------------
 // Misc Defaults
 // -----------------------------------------------------------------------------
@@ -510,6 +520,6 @@
 // RUN:   -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
 // RUN:   -mcpu=hexagonv60 \
 // RUN:   %s 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK070 %s
-// CHECK070:      "-cc1"
-// CHECK070:      "-Wreturn-type"
+// RUN:   | FileCheck -check-prefix=CHECK080 %s
+// CHECK080:      "-cc1"
+// CHECK080:      "-Wreturn-type"