[AArch64] Fix verifier error when outlining indirect calls

The MachineOutliner for AArch64 transforms indirect calls into indirect
tail calls, replacing the call with the TCRETURNri pseudo-instruction.
This pseudo lowers to a BR, but has the isCall and isReturn flags set.

The problem is that TCRETURNri takes a tcGPR64 as the register argument,
to prevent indiret tail-calls from using caller-saved registers. The
indirect calls transformed by the outliner could use caller-saved
registers. This is fine, because the outliner ensures that the register
is available at all call sites. However, this causes a verifier failure
when the register is not in tcGPR64. The fix is to add a new
pseudo-instruction like TCRETURNri, but which accepts any GPR.

Differential revision: https://reviews.llvm.org/D52829

llvm-svn: 343959

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
index b29a4cd0a3f..469c9c27ec4 100644
--- a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -590,7 +590,8 @@ void AArch64AsmPrinter::EmitInstruction(const MachineInstr *MI) {
   // Tail calls use pseudo instructions so they have the proper code-gen
   // attributes (isCall, isReturn, etc.). We lower them to the real
   // instruction here.
-  case AArch64::TCRETURNri: {
+  case AArch64::TCRETURNri:
+  case AArch64::TCRETURNriALL: {
     MCInst TmpInst;
     TmpInst.setOpcode(AArch64::BR);
     TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));