Distinguish early clobber output operands from clobbered registers.

Both become <earlyclobber> defs on the INLINEASM MachineInstr, but we
now use two different asm operand kinds.

The new Kind_Clobber is treated identically to the old
Kind_RegDefEarlyClobber for now, but x87 floating point stack inline
assembly does care about the difference.

This will pop a register off the stack:

  asm("fstp %st" : : "t"(x) : "st");

While this will pop the input and push an output:

  asm("fst %st" : "=&t"(r) : "t"(x));

We need to know if ST0 was a clobber or an output operand, and we can't
depend on <dead> flags for that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133902 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index d4d8202475..938b83dd0e 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1443,9 +1443,10 @@ void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
       switch (InlineAsm::getKind(Flag)) {
       case InlineAsm::Kind_RegUse:             OS << ":[reguse]"; break;
       case InlineAsm::Kind_RegDef:             OS << ":[regdef]"; break;
+      case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec]"; break;
+      case InlineAsm::Kind_Clobber:            OS << ":[clobber]"; break;
       case InlineAsm::Kind_Imm:                OS << ":[imm]"; break;
       case InlineAsm::Kind_Mem:                OS << ":[mem]"; break;
-      case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec]"; break;
       default: OS << ":[??" << InlineAsm::getKind(Flag) << ']'; break;
       }