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Hiroshi Inoue 727bd578df [PowerPC] fix a bug in TCO eligibility check
If the callee and caller use different calling convensions, we cannot apply TCO if the callee requires arguments on stack; e.g. C calling convention and Fast CC use the same registers for parameter passing, but the stack offset is not necessarily same.

This patch also recommit r319218 "[PowerPC] Allow tail calls of fastcc functions from C CallingConv functions." by @sfertile since the problem reported in r320106 should be fixed.

Differential Revision: https://reviews.llvm.org/D40893



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321579 91177308-0d34-0410-b5e6-96231b3b80d8
2017-12-30 08:09:04 +00:00
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