[llvm-commits] [PATCH] Sparc backend fixes

[Venkatraman Govindaraju]

Hello,

 The attached path fixes the following three issues with the Sparc backend.

 1. EmitInstrWithCustomInserter() in SparcISelLowering splices
MachineBasicBlock before inserting them into the machine function. It
corrupts the def-use chain of MachineOperand and causes a infinite
loop in llc. Now, the patch avoids this by inserting the machine
basicblocks into the machine function before splicing the original
basicblock.

 2. When the bitcode has "select_cc", Sparc backend may not generate
correct assembly code. Since select_ccs do not have ICC/FCC as Uses,
the corresponding def of ICC/FCC can be marked as dead and removed.
Now, the select_ccs have ICC/FCC as Uses.

 3. Sparc backend does not know about Y register. It causes the "rdy"
and "wry" instructions to be marked as dead and removed. Now it knows
about Y and generate correct code.

 Please let me know if the patch is okay to commit.

Thanks,
Venkatraman
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