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Added tail call optimization to the x86 back end. It can be

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enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42870 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2007-10-11 19:40:01 +00:00
parent 68c8411ef5
commit c85e1716f0
16 changed files with 928 additions and 65 deletions
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2
lib/Target/X86/X86InstrInfo.cpp
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@@ -706,6 +706,8 @@ bool X86InstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
if (MBB.empty()) return false;
switch (MBB.back().getOpcode()) {
case X86::TCRETURNri:
case X86::TCRETURNdi:
case X86::RET: // Return.
case X86::RETI:
case X86::TAILJMPd: