fix rdar://8456371 - Handle commutable instructions written backward.

[oota-llvm.git] / lib / Target / X86 / AsmParser / X86AsmParser.cpp

diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index bb6e05c286402657ecb3320d9ef5f5c980ab6eda..01ccc50adf92302be5e885da479d4fddd7f21454 100644 (file)
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -911,6 +911,16 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
     Operands.erase(Operands.begin() + 2);
   }
 
+  // FIXME: Hack to handle "f{mul*,add*} st(0), $op" the same as
+  // "f{mul*,add*} $op", since they commute.
+  if ((Name.startswith("fmul") || Name.startswith("fadd")) &&
+      Operands.size() == 3 &&
+      static_cast<X86Operand*>(Operands[1])->isReg() &&
+      static_cast<X86Operand*>(Operands[1])->getReg() == X86::ST0) {
+    delete Operands[1];
+    Operands.erase(Operands.begin() + 1);
+  }
+  
   // FIXME: Hack to handle "imul <imm>, B" which is an alias for "imul <imm>, B,
   // B".
   if (Name.startswith("imul") && Operands.size() == 3 &&