[AMDGPU] Assembler: Support abs() syntax.

Support legacy SP3 abs(v1) syntax. InstPrinter still uses |v1|.
Add tests.

Differential Revision: http://reviews.llvm.org/D17887

llvm-svn: 263006

1 files changed, 19 insertions, 2 deletions

diff --git a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
index 6277ff371ba..a4d2909e8a0 100644
--- a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
+++ b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
@@ -1008,12 +1008,23 @@ AMDGPUAsmParser::parseOperand(OperandVector &Operands, StringRef Mnemonic) {
       getLexer().is(AsmToken::EndOfStatement))
     return ResTy;
 
-  bool Negate = false, Abs = false;
+  bool Negate = false, Abs = false, Abs2 = false;
+
   if (getLexer().getKind()== AsmToken::Minus) {
     Parser.Lex();
     Negate = true;
   }
 
+  if (getLexer().getKind() == AsmToken::Identifier && Parser.getTok().getString() == "abs") {
+    Parser.Lex();
+    Abs2 = true;
+    if (getLexer().isNot(AsmToken::LParen)) {
+      Error(Parser.getTok().getLoc(), "expected left paren after abs");
+      return MatchOperand_ParseFail;
+    }
+    Parser.Lex();
+  }
+
   if (getLexer().getKind() == AsmToken::Pipe) {
     Parser.Lex();
     Abs = true;
@@ -1065,7 +1076,13 @@ AMDGPUAsmParser::parseOperand(OperandVector &Operands, StringRef Mnemonic) {
           Parser.Lex();
           Modifiers |= 0x2;
         }
-
+        if (Abs2) {
+          if (getLexer().isNot(AsmToken::RParen)) {
+            return MatchOperand_ParseFail;
+          }
+          Parser.Lex();
+          Modifiers |= 0x2;
+        }
         Operands.push_back(AMDGPUOperand::CreateReg(
             RegNo, S, E, getContext().getRegisterInfo(), &getSTI(),
             isForcedVOP3()));