From 819e3e02a9d4e2b0e986c5d2cfe13f138cff17cc Mon Sep 17 00:00:00 2001 From: Hans Wennborg Date: Tue, 7 Feb 2017 20:37:45 +0000 Subject: [X86] Disable conditional tail calls (PR31257) They are currently modelled incorrectly (as calls, which clobber registers, confusing e.g. Machine Copy Propagation). Reverting until we figure out the proper solution. llvm-svn: 294348 --- llvm/lib/Target/X86/X86MCInstLower.cpp | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'llvm/lib/Target/X86/X86MCInstLower.cpp') diff --git a/llvm/lib/Target/X86/X86MCInstLower.cpp b/llvm/lib/Target/X86/X86MCInstLower.cpp index 65949531126..0887643ed5a 100644 --- a/llvm/lib/Target/X86/X86MCInstLower.cpp +++ b/llvm/lib/Target/X86/X86MCInstLower.cpp @@ -499,16 +499,11 @@ ReSimplify: break; } - // TAILJMPd, TAILJMPd64, TailJMPd_cc - Lower to the correct jump instruction. + // TAILJMPd, TAILJMPd64 - Lower to the correct jump instruction. { unsigned Opcode; case X86::TAILJMPr: Opcode = X86::JMP32r; goto SetTailJmpOpcode; case X86::TAILJMPd: case X86::TAILJMPd64: Opcode = X86::JMP_1; goto SetTailJmpOpcode; - case X86::TAILJMPd_CC: - case X86::TAILJMPd64_CC: - Opcode = X86::GetCondBranchFromCond( - static_cast(MI->getOperand(1).getImm())); - goto SetTailJmpOpcode; SetTailJmpOpcode: MCOperand Saved = OutMI.getOperand(0); @@ -1299,11 +1294,9 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) { case X86::TAILJMPr: case X86::TAILJMPm: case X86::TAILJMPd: - case X86::TAILJMPd_CC: case X86::TAILJMPr64: case X86::TAILJMPm64: case X86::TAILJMPd64: - case X86::TAILJMPd64_CC: case X86::TAILJMPr64_REX: case X86::TAILJMPm64_REX: // Lower these as normal, but add some comments. -- cgit v1.2.3