[mips] Add support for .cpload.

Summary:
This directive is used for setting up $gp in the beginning of a function.
It expands to three instructions if PIC is enabled:
lui   $gp, %hi(_gp_disp)
addui $gp, $gp, %lo(_gp_disp)
addu  $gp, $gp, $reg

_gp_disp is a special symbol that the linker sets to the distance between
the lui instruction and the context pointer (_gp).

Reviewers: dsanders

Reviewed By: dsanders

Differential Revision: http://reviews.llvm.org/D3480

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207637 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/Target/Mips/MipsTargetStreamer.h b/lib/Target/Mips/MipsTargetStreamer.h
index 7873ed9a60..e649a4d14f 100644
--- a/lib/Target/Mips/MipsTargetStreamer.h
+++ b/lib/Target/Mips/MipsTargetStreamer.h
@@ -47,6 +47,9 @@ public:
   virtual void emitDirectiveSetMips64() = 0;
   virtual void emitDirectiveSetMips64R2() = 0;
   virtual void emitDirectiveSetDsp() = 0;
+
+  // PIC support
+  virtual void emitDirectiveCpload(unsigned RegNo) = 0;
 };
 
 // This part is for ascii assembly output
@@ -83,6 +86,9 @@ public:
   void emitDirectiveSetMips64() override;
   void emitDirectiveSetMips64R2() override;
   void emitDirectiveSetDsp() override;
+
+  // PIC support
+  virtual void emitDirectiveCpload(unsigned RegNo);
 };
 
 // This part is for ELF object output
@@ -128,6 +134,14 @@ public:
   void emitDirectiveSetMips64() override;
   void emitDirectiveSetMips64R2() override;
   void emitDirectiveSetDsp() override;
+
+  // PIC support
+  virtual void emitDirectiveCpload(unsigned RegNo);
+
+protected:
+  bool isO32() const { return STI.getFeatureBits() & Mips::FeatureO32; }
+  bool isN32() const { return STI.getFeatureBits() & Mips::FeatureN32; }
+  bool isN64() const { return STI.getFeatureBits() & Mips::FeatureN64; }
 };
 }
 #endif