Use std::bitset for SubtargetFeatures.

Previously, subtarget features were a bitfield with the underlying type being uint64_t. 
Since several targets (X86 and ARM, in particular) have hit or were very close to hitting this bound, switching the features to use a bitset.
No functional change.

The first several times this was committed (e.g. r229831, r233055), it caused several buildbot failures.
Apparently the reason for most failures was both clang and gcc's inability to deal with large numbers (> 10K) of bitset constructor calls in tablegen-generated initializers of instruction info tables. 
This should now be fixed.

llvm-svn: 238192

1 files changed, 19 insertions, 19 deletions

diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
index f14160d2104..a59f353c7eb 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
@@ -386,7 +386,7 @@ MipsTargetELFStreamer::MipsTargetELFStreamer(MCStreamer &S,
   MCAssembler &MCA = getStreamer().getAssembler();
   Pic = MCA.getContext().getObjectFileInfo()->getRelocM() == Reloc::PIC_;
 
-  uint64_t Features = STI.getFeatureBits();
+  const FeatureBitset &Features = STI.getFeatureBits();
 
   // Set the header flags that we can in the constructor.
   // FIXME: This is a fairly terrible hack. We set the rest
@@ -402,35 +402,35 @@ MipsTargetELFStreamer::MipsTargetELFStreamer(MCStreamer &S,
   unsigned EFlags = MCA.getELFHeaderEFlags();
 
   // Architecture
-  if (Features & Mips::FeatureMips64r6)
+  if (Features[Mips::FeatureMips64r6])
     EFlags |= ELF::EF_MIPS_ARCH_64R6;
-  else if (Features & Mips::FeatureMips64r2 ||
-           Features & Mips::FeatureMips64r3 ||
-           Features & Mips::FeatureMips64r5)
+  else if (Features[Mips::FeatureMips64r2] ||
+           Features[Mips::FeatureMips64r3] ||
+           Features[Mips::FeatureMips64r5])
     EFlags |= ELF::EF_MIPS_ARCH_64R2;
-  else if (Features & Mips::FeatureMips64)
+  else if (Features[Mips::FeatureMips64])
     EFlags |= ELF::EF_MIPS_ARCH_64;
-  else if (Features & Mips::FeatureMips5)
+  else if (Features[Mips::FeatureMips5])
     EFlags |= ELF::EF_MIPS_ARCH_5;
-  else if (Features & Mips::FeatureMips4)
+  else if (Features[Mips::FeatureMips4])
     EFlags |= ELF::EF_MIPS_ARCH_4;
-  else if (Features & Mips::FeatureMips3)
+  else if (Features[Mips::FeatureMips3])
     EFlags |= ELF::EF_MIPS_ARCH_3;
-  else if (Features & Mips::FeatureMips32r6)
+  else if (Features[Mips::FeatureMips32r6])
     EFlags |= ELF::EF_MIPS_ARCH_32R6;
-  else if (Features & Mips::FeatureMips32r2 ||
-           Features & Mips::FeatureMips32r3 ||
-           Features & Mips::FeatureMips32r5)
+  else if (Features[Mips::FeatureMips32r2] ||
+           Features[Mips::FeatureMips32r3] ||
+           Features[Mips::FeatureMips32r5])
     EFlags |= ELF::EF_MIPS_ARCH_32R2;
-  else if (Features & Mips::FeatureMips32)
+  else if (Features[Mips::FeatureMips32])
     EFlags |= ELF::EF_MIPS_ARCH_32;
-  else if (Features & Mips::FeatureMips2)
+  else if (Features[Mips::FeatureMips2])
     EFlags |= ELF::EF_MIPS_ARCH_2;
   else
     EFlags |= ELF::EF_MIPS_ARCH_1;
 
   // Other options.
-  if (Features & Mips::FeatureNaN2008)
+  if (Features[Mips::FeatureNaN2008])
     EFlags |= ELF::EF_MIPS_NAN2008;
 
   // -mabicalls and -mplt are not implemented but we should act as if they were
@@ -470,7 +470,7 @@ void MipsTargetELFStreamer::finish() {
   DataSection.setAlignment(std::max(16u, DataSection.getAlignment()));
   BSSSection.setAlignment(std::max(16u, BSSSection.getAlignment()));
 
-  uint64_t Features = STI.getFeatureBits();
+  const FeatureBitset &Features = STI.getFeatureBits();
 
   // Update e_header flags. See the FIXME and comment above in
   // the constructor for a full rundown on this.
@@ -483,10 +483,10 @@ void MipsTargetELFStreamer::finish() {
   else if (getABI().IsN32())
     EFlags |= ELF::EF_MIPS_ABI2;
 
-  if (Features & Mips::FeatureGP64Bit) {
+  if (Features[Mips::FeatureGP64Bit]) {
     if (getABI().IsO32())
       EFlags |= ELF::EF_MIPS_32BITMODE; /* Compatibility Mode */
-  } else if (Features & Mips::FeatureMips64r2 || Features & Mips::FeatureMips64)
+  } else if (Features[Mips::FeatureMips64r2] || Features[Mips::FeatureMips64])
     EFlags |= ELF::EF_MIPS_32BITMODE;
 
   // If we've set the cpic eflag and we're n64, go ahead and set the pic