[PowerPC] Add feature for Power8 vector extensions

The current VSX feature for PowerPC specifies availability of the VSX
instructions added with the 2.06 architecture version.  With 2.07, the
architecture adds new instructions to both the Category:Vector and
Category:VSX instruction sets.  Additionally, unaligned vector storage
operations have improved performance.

This patch adds a feature to provide access to the new instructions
and performance capabilities of Power8.  For compatibility with GCC,
the feature is controlled via a new -mpower8-vector switch, and the
feature causes the __POWER8_VECTOR__ builtin define to be generated by
the preprocessor.

There is a companion patch for llvm being committed at the same time.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219502 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index b24d16ba068b11dd6dab71346bdcaeceeeef5664..d1f776c11b647876b4baf1cf712fd71aa4a6a8ee 100644 (file)
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1171,6 +1171,10 @@ def mgeneral_regs_only : Flag<["-"], "mgeneral-regs-only">, Group<m_aarch64_Feat
 
 def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
 def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
+def mpower8_vector : Flag<["-"], "mpower8-vector">,
+    Group<m_ppc_Features_Group>;
+def mno_power8_vector : Flag<["-"], "mno-power8-vector">,
+    Group<m_ppc_Features_Group>;
 def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
 def mno_fprnd : Flag<["-"], "mno-fprnd">, Group<m_ppc_Features_Group>;
 def mmfcrf : Flag<["-"], "mmfcrf">, Group<m_ppc_Features_Group>;

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 0df01df77fb54ea4df20872cb592c8e41170c134..902f1c3c610206f7791478b36946a84db41da65d 100644 (file)
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -672,13 +672,14 @@ class PPCTargetInfo : public TargetInfo {
 
   // Target cpu features.
   bool HasVSX;
+  bool HasPower8Vector;
 
 protected:
   std::string ABI;
 
 public:
   PPCTargetInfo(const llvm::Triple &Triple)
-      : TargetInfo(Triple), HasVSX(false) {
+    : TargetInfo(Triple), HasVSX(false), HasPower8Vector(false) {
     BigEndian = (Triple.getArch() != llvm::Triple::ppc64le);
     LongDoubleWidth = LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::PPCDoubleDouble;
@@ -934,6 +935,11 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       continue;
     }
 
+    if (Feature == "power8-vector") {
+      HasPower8Vector = true;
+      continue;
+    }
+
     // TODO: Finish this list and add an assert that we've handled them
     // all.
   }
@@ -1084,6 +1090,8 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
 
   if (HasVSX)
     Builder.defineMacro("__VSX__");
+  if (HasPower8Vector)
+    Builder.defineMacro("__POWER8_VECTOR__");
 
   // FIXME: The following are not yet generated here by Clang, but are
   //        generated by GCC:

diff --git a/test/Driver/ppc-features.cpp b/test/Driver/ppc-features.cpp
index c7b59cc7aaa21f0c74760c1fdd78924ad530eeba..c62f5b969736b0443ff588db4aeb5c12509c35db 100644 (file)
--- a/test/Driver/ppc-features.cpp
+++ b/test/Driver/ppc-features.cpp
@@ -95,6 +95,12 @@
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-vsx -mvsx -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-VSX %s
 // CHECK-VSX: "-target-feature" "+vsx"
 
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-power8-vector -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOP8VECTOR %s
+// CHECK-NOP8VECTOR: "-target-feature" "-power8-vector"
+
+// 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-crbits -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOCRBITS %s
 // CHECK-NOCRBITS: "-target-feature" "-crbits"
 

diff --git a/test/Preprocessor/predefined-arch-macros.c b/test/Preprocessor/predefined-arch-macros.c
index 5f5380926dcacc10388ec937bfbe87a6e6950260..8b58c9ce01f3af2878c3c32c3ad20737e944439e 100644 (file)
--- a/test/Preprocessor/predefined-arch-macros.c
+++ b/test/Preprocessor/predefined-arch-macros.c
@@ -1652,3 +1652,10 @@
 // RUN:   | FileCheck %s -check-prefix=CHECK_PPC_VSX_M64
 //
 // CHECK_PPC_VSX_M64: #define __VSX__
+//
+// RUN: %clang -mpower8-vector -E -dM %s -o - 2>&1 \
+// RUN:     -target powerpc64-unknown-linux \
+// RUN:   | FileCheck %s -check-prefix=CHECK_PPC_POWER8_VECTOR_M64
+//
+// CHECK_PPC_POWER8_VECTOR_M64: #define __POWER8_VECTOR__
+//