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[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.

llvm-svn: 219501
This commit is contained in:
Bill Schmidt 2014-10-10 15:09:28 +00:00
parent 98bd58ca33
commit cfc4a54a48
3 changed files with 10 additions and 2 deletions
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5
llvm/lib/Target/PowerPC/PPC.td
View File

@ -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 //

5
llvm/lib/Target/PowerPC/PPCSubtarget.cpp
View File

@ -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) {

2
llvm/lib/Target/PowerPC/PPCSubtarget.h
View File

@ -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; }