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Fix some liveout handling related to tail calls, see comments.

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I don't think this ever resulted in problems on x86, but it
would on ARM.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2010-06-05 00:30:45 +00:00
parent f2aac4db4e
commit 88004c25c7
2 changed files with 12 additions and 12 deletions
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7
lib/CodeGen/LiveVariables.cpp
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@ -609,7 +609,12 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
// Finally, if the last instruction in the block is a return, make sure to
// mark it as using all of the live-out values in the function.
if (!MBB->empty() && MBB->back().getDesc().isReturn()) {
// Things marked both call and return are tail calls; do not do this for
// them. The tail callee need not take the same registers as input
// that it produces as output, and there are dependencies for its input
// registers elsewhere.
if (!MBB->empty() && MBB->back().getDesc().isReturn()
&& !MBB->back().getDesc().isCall()) {
MachineInstr *Ret = &MBB->back();
for (MachineRegisterInfo::liveout_iterator