Add a target hook to allow changing the tail duplication limit based on the
contents of the block to be duplicated. Use this for ARM Cortex A8/9 to
be more aggressive tail duplicating indirect branches, since it makes it
much more likely that they will be predicted in the branch target buffer.
Testcase coming soon.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89187 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 87b78a9..432ed78 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -109,6 +109,8 @@
if (UseNEONFP.getPosition() == 0)
UseNEONForSinglePrecisionFP = true;
}
+ HasBranchTargetBuffer = (CPUString == "cortex-a8" ||
+ CPUString == "cortex-a9");
}
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.