[PATCH] D20276: [MBP] Reduce code size by running tail merging in MBP

[Haicheng Wu via llvm-commits]

haicheng marked an inline comment as done.

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Comment at: lib/CodeGen/MachineBlockPlacement.cpp:1479
@@ +1478,3 @@
+  // TailMerge can create jump into if branches that make CFG irreducible for
+  // HW that requires structurized CFG.
+  bool EnableTailMerge = !F.getTarget().requiresStructuredCFG() &&
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majnemer wrote:
> deadalnix wrote:
> > Out of curiosity, do you have example of hardware doing this ?
> WebAssembly IIRC.
I know old AMD GPU had this requirement.  Its IL has instructions like "if_xxx" and "endif".


Repository:
  rL LLVM

http://reviews.llvm.org/D20276