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| author | Reid Kleckner <reid@kleckner.net> | 2014-04-24 20:14:34 +0000 |
|---|---|---|
| committer | Reid Kleckner <reid@kleckner.net> | 2014-04-24 20:14:34 +0000 |
| commit | 5772b77789728e045ccd8c93d79820632e81c4e6 (patch) | |
| tree | 6f4029a3081e1f1e6a0f9e9576737c5506e59bd1 /llvm/lib/Target/ARM64 | |
| parent | 0fbb1e91e57829d277bbea3ef1402ee7bc871dea (diff) | |
| download | bcm5719-llvm-5772b77789728e045ccd8c93d79820632e81c4e6.tar.gz bcm5719-llvm-5772b77789728e045ccd8c93d79820632e81c4e6.zip | |
Add 'musttail' marker to call instructions
This is similar to the 'tail' marker, except that it guarantees that
tail call optimization will occur. It also comes with convervative IR
verification rules that ensure that tail call optimization is possible.
Reviewers: nicholas
Differential Revision: http://llvm-reviews.chandlerc.com/D3240
llvm-svn: 207143
Diffstat (limited to 'llvm/lib/Target/ARM64')
| -rw-r--r-- | llvm/lib/Target/ARM64/ARM64ISelLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM64/ARM64ISelLowering.cpp b/llvm/lib/Target/ARM64/ARM64ISelLowering.cpp index 154306c02be..58e425938e1 100644 --- a/llvm/lib/Target/ARM64/ARM64ISelLowering.cpp +++ b/llvm/lib/Target/ARM64/ARM64ISelLowering.cpp @@ -1957,6 +1957,9 @@ SDValue ARM64TargetLowering::LowerCall(CallLoweringInfo &CLI, IsTailCall = isEligibleForTailCallOptimization( Callee, CallConv, IsVarArg, IsStructRet, MF.getFunction()->hasStructRetAttr(), Outs, OutVals, Ins, DAG); + if (!IsTailCall && CLI.CS && CLI.CS->isMustTailCall()) + report_fatal_error("failed to perform tail call elimination on a call " + "site marked musttail"); // We don't support GuaranteedTailCallOpt, only automatically // detected sibcalls. // FIXME: Re-evaluate. Is this true? Should it be true? |
