[PATCH] [PPC64LE] Add -m[no-]optimize-swaps option

[Bill Schmidt]

Hi hfinkel, kbarton, nemanjai, seurer,

This patch adds a new switch (-m[no-]optimize-swaps) that sets the optimize-swaps feature attribute for the back end.  The code controlled by this switch is under review at http://reviews.llvm.org/D8565.

http://reviews.llvm.org/D8706

Files:
  include/clang/Driver/Options.td
  test/Driver/ppc-features.cpp

Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1280,6 +1280,10 @@
 def mno_qpx : Flag<["-"], "mno-qpx">, Group<m_ppc_Features_Group>;
 def mcrbits : Flag<["-"], "mcrbits">, Group<m_ppc_Features_Group>;
 def mno_crbits : Flag<["-"], "mno-crbits">, Group<m_ppc_Features_Group>;
+def moptimize_swaps : Flag<["-"], "moptimize-swaps">,
+                      Group<m_ppc_Features_Group>;
+def mno_optimize_swaps : Flag<["-"], "mno-optimize-swaps">,
+                         Group<m_ppc_Features_Group>;
 def minvariant_function_descriptors :
   Flag<["-"], "minvariant-function-descriptors">, Group<m_ppc_Features_Group>;
 def mno_invariant_function_descriptors :
Index: test/Driver/ppc-features.cpp
===================================================================
--- test/Driver/ppc-features.cpp
+++ test/Driver/ppc-features.cpp
@@ -107,6 +107,12 @@
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-power8-vector -mpower8-vector -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-P8VECTOR %s
 // CHECK-P8VECTOR: "-target-feature" "+power8-vector"
 
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-optimize-swaps -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOOPTSWAPS %s
+// CHECK-NOOPTSWAPS: "-target-feature" "-optimize-swaps"
+
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-optimize-swaps -moptimize-swaps -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-OPTSWAPS %s
+// CHECK-OPTSWAPS: "-target-feature" "+optimize-swaps"
+
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-crbits -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOCRBITS %s
 // CHECK-NOCRBITS: "-target-feature" "-crbits"

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