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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-11-15 01:15:30 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-11-15 01:15:30 +0000 |
| commit | c2ecf3efbf375fc82bb1cea6afd7448498f9ae75 (patch) | |
| tree | 4cb44beba42b77f41d955701edd3e69df3ec1b68 /lib/Target/X86/X86InstrInfo.h | |
| parent | 2947f730a96fc602ea008bba1929ae4f0638850a (diff) | |
| download | llvm-c2ecf3efbf375fc82bb1cea6afd7448498f9ae75.tar.gz llvm-c2ecf3efbf375fc82bb1cea6afd7448498f9ae75.tar.bz2 llvm-c2ecf3efbf375fc82bb1cea6afd7448498f9ae75.tar.xz | |
Break false dependencies before partial register updates.
Two new TargetInstrInfo hooks lets the target tell ExecutionDepsFix
about instructions with partial register updates causing false unwanted
dependencies.
The ExecutionDepsFix pass will break the false dependencies if the
updated register was written in the previoius N instructions.
The small loop added to sse-domains.ll runs twice as fast with
dependency-breaking instructions inserted.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144602 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrInfo.h')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h index 97009dbdbe..ee488d8f01 100644 --- a/lib/Target/X86/X86InstrInfo.h +++ b/lib/Target/X86/X86InstrInfo.h @@ -345,6 +345,11 @@ public: void setExecutionDomain(MachineInstr *MI, unsigned Domain) const; + unsigned getPartialRegUpdateClearance(const MachineInstr *MI, unsigned OpNum, + const TargetRegisterInfo *TRI) const; + void breakPartialRegDependency(MachineBasicBlock::iterator MI, unsigned OpNum, + const TargetRegisterInfo *TRI) const; + MachineInstr* foldMemoryOperandImpl(MachineFunction &MF, MachineInstr* MI, unsigned OpNum, |