diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMISelLowering.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp index d9893db3773..1726d6bcb30 100644 --- a/llvm/lib/Target/ARM/ARMISelLowering.cpp +++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp @@ -2282,6 +2282,13 @@ ARMTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, assert(Subtarget->supportsTailCall()); + // Tail calls to function pointers cannot be optimized for Thumb1 if the args + // to the call take up r0-r3. The reason is that there are no legal registers + // left to hold the pointer to the function to be called. + if (Subtarget->isThumb1Only() && Outs.size() >= 4 && + !isa<GlobalAddressSDNode>(Callee.getNode())) + return false; + // Look for obvious safe cases to perform tail call optimization that do not // require ABI changes. This is what gcc calls sibcall. |
