[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 cfe being committed at the same time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219501 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPC.td b/lib/Target/PowerPC/PPC.td
index 8f4c1ee77a727bbd7279fb1fd81674105321a95a..f13be4ab9d047c69eaab419ad82a231f926988c3 100644 (file)
--- a/lib/Target/PowerPC/PPC.td
+++ b/lib/Target/PowerPC/PPC.td
@@ -104,6 +104,10 @@ def FeatureQPX       : SubtargetFeature<"qpx","HasQPX", "true",
 def FeatureVSX       : SubtargetFeature<"vsx","HasVSX", "true",
                                         "Enable VSX instructions",
                                         [FeatureAltivec]>;
+def FeaturePower8Vector : SubtargetFeature<"power8-vector", "HasPower8Vector",
+                                           "true",
+                                           "Enable Power8 vector instructions",
+                                           [FeatureVSX, FeatureAltivec]>;
 
 def DeprecatedMFTB   : SubtargetFeature<"", "DeprecatedMFTB", "true",
                                         "Treat mftb as deprecated">;
@@ -116,7 +120,6 @@ def DeprecatedDST    : SubtargetFeature<"", "DeprecatedDST", "true",
 // CMPB         p6, p6x, p7        cmpb
 // DFP          p6, p6x, p7        decimal floating-point instructions
 // POPCNTB      p5 through p7      popcntb and related instructions
-// VSX          p7                 vector-scalar instruction set
 
 //===----------------------------------------------------------------------===//
 // ABI Selection                                                              //

diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index ba8bda9ec2ca34fdc945ad4bc1aff008cb38a8b7..8d00be829592ead9544037e98debc06f0efc0af9 100644 (file)
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -94,6 +94,7 @@ void PPCSubtarget::initializeEnvironment() {
   HasSPE = false;
   HasQPX = false;
   HasVSX = false;
+  HasPower8Vector = false;
   HasFCPSGN = false;
   HasFSQRT = false;
   HasFRE = false;
@@ -155,8 +156,10 @@ void PPCSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
 
   // FIXME: For now, we disable VSX in little-endian mode until endian
   // issues in those instructions can be addressed.
-  if (IsLittleEndian)
+  if (IsLittleEndian) {
     HasVSX = false;
+    HasPower8Vector = false;
+  }
 
   // Determine default ABI.
   if (TargetABI == PPC_ABI_UNKNOWN) {

diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h
index 9e4953f20d9edfbfdee2a82617e874a1eff8a84d..8c135379c7fd14bbd6e189193a9591504362ecb4 100644 (file)
--- a/lib/Target/PowerPC/PPCSubtarget.h
+++ b/lib/Target/PowerPC/PPCSubtarget.h
@@ -91,6 +91,7 @@ protected:
   bool HasSPE;
   bool HasQPX;
   bool HasVSX;
+  bool HasPower8Vector;
   bool HasFCPSGN;
   bool HasFSQRT;
   bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
@@ -215,6 +216,7 @@ public:
   bool hasSPE() const { return HasSPE; }
   bool hasQPX() const { return HasQPX; }
   bool hasVSX() const { return HasVSX; }
+  bool hasPower8Vector() const { return HasPower8Vector; }
   bool hasMFOCRF() const { return HasMFOCRF; }
   bool hasISEL() const { return HasISEL; }
   bool hasPOPCNTD() const { return HasPOPCNTD; }