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Make tail merging the default, except on powerPC. There was no prior art

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for a target-dependent default with a command-line override; this way
should be generally usable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37285 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2007-05-22 17:14:46 +00:00
parent 9621921acb
commit 81da02b553
8 changed files with 69 additions and 7 deletions
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4
lib/Target/PowerPC/PPCTargetMachine.cpp
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@@ -96,6 +96,10 @@ PPCTargetMachine::PPCTargetMachine(const Module &M, const std::string &FS,
setRelocationModel(Reloc::Static);
}
/// Override this for PowerPC. Tail merging happily breaks up instruction issue
/// groups, which typically degrades performance.
const bool PPCTargetMachine::DoTailMergeDefault() const { return false; }
PPC32TargetMachine::PPC32TargetMachine(const Module &M, const std::string &FS)
: PPCTargetMachine(M, FS, false) {
}