[RISCV] Add support for .half, .hword, .word, .dword directives

These directives are recognised by gas. Support is added through the use of 
addAliasForDirective.

Also match RISC-V gcc in preferring .half and .word for 16-bit and 32-bit data 
directives.

llvm-svn: 332574

2 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 487eea14b16..c51e4b3c606 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -105,6 +105,10 @@ public:
   RISCVAsmParser(const MCSubtargetInfo &STI, MCAsmParser &Parser,
                  const MCInstrInfo &MII, const MCTargetOptions &Options)
       : MCTargetAsmParser(Options, STI, MII) {
+    Parser.addAliasForDirective(".half", ".2byte");
+    Parser.addAliasForDirective(".hword", ".2byte");
+    Parser.addAliasForDirective(".word", ".4byte");
+    Parser.addAliasForDirective(".dword", ".8byte");
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
   }
 };
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCAsmInfo.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCAsmInfo.cpp
index d622911e92c..780dae410cd 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCAsmInfo.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCAsmInfo.cpp
@@ -22,4 +22,6 @@ RISCVMCAsmInfo::RISCVMCAsmInfo(const Triple &TT) {
   CommentString = "#";
   AlignmentIsInBytes = false;
   SupportsDebugInformation = true;
+  Data16bitsDirective = "\t.half\t";
+  Data32bitsDirective = "\t.word\t";
 }