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This is the first step toward supporting shrink-wrapping for this target. The changes could be summarized by these items: - Expand the tail-call return as part of the expand pseudo pass. - Get rid of the assumptions that the epilogue is the exit block: * Do not assume which registers are free in the epilogue. (This indirectly improve the lowering of the code for the segmented stacks, see the test cases.) * Take into account that the basic block can be empty. Related to <rdar://problem/20821730> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242714 91177308-0d34-0410-b5e6-96231b3b80d8 |
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