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| author | Omer Paparo Bivas <omer.paparo.bivas@intel.com> | 2017-10-24 06:16:03 +0000 |
|---|---|---|
| committer | Omer Paparo Bivas <omer.paparo.bivas@intel.com> | 2017-10-24 06:16:03 +0000 |
| commit | 2251c79aba5af528e7f8fc40e6b4e116230672b8 (patch) | |
| tree | 5998d83161718a06c275aeb1dabbdff5d3a563b6 /llvm/lib/MC/MCFragment.cpp | |
| parent | c6d0b6c1032716082b2ea1814322abb81947ebdc (diff) | |
| download | bcm5719-llvm-2251c79aba5af528e7f8fc40e6b4e116230672b8.tar.gz bcm5719-llvm-2251c79aba5af528e7f8fc40e6b4e116230672b8.zip | |
[MC] Adding code padding for performance stability - infrastructure. NFC.
Infrastructure designed for padding code with nop instructions in key places such that preformance improvement will be achieved.
The infrastructure is implemented such that the padding is done in the Assembler after the layout is done and all IPs and alignments are known.
This patch by itself in a NFC. Future patches will make use of this infrastructure to implement required policies for code padding.
Reviewers:
aaboud
zvi
craig.topper
gadi.haber
Differential revision: https://reviews.llvm.org/D34393
Change-Id: I92110d0c0a757080a8405636914a93ef6f8ad00e
llvm-svn: 316413
Diffstat (limited to 'llvm/lib/MC/MCFragment.cpp')
| -rw-r--r-- | llvm/lib/MC/MCFragment.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/MC/MCFragment.cpp b/llvm/lib/MC/MCFragment.cpp index 31acca01bed..94839de14f8 100644 --- a/llvm/lib/MC/MCFragment.cpp +++ b/llvm/lib/MC/MCFragment.cpp @@ -278,6 +278,9 @@ void MCFragment::destroy() { case FT_LEB: delete cast<MCLEBFragment>(this); return; + case FT_Padding: + delete cast<MCPaddingFragment>(this); + return; case FT_SafeSEH: delete cast<MCSafeSEHFragment>(this); return; @@ -322,6 +325,7 @@ LLVM_DUMP_METHOD void MCFragment::dump() const { case MCFragment::FT_Dwarf: OS << "MCDwarfFragment"; break; case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break; case MCFragment::FT_LEB: OS << "MCLEBFragment"; break; + case MCFragment::FT_Padding: OS << "MCPaddingFragment"; break; case MCFragment::FT_SafeSEH: OS << "MCSafeSEHFragment"; break; case MCFragment::FT_CVInlineLines: OS << "MCCVInlineLineTableFragment"; break; case MCFragment::FT_CVDefRange: OS << "MCCVDefRangeTableFragment"; break; @@ -419,6 +423,19 @@ LLVM_DUMP_METHOD void MCFragment::dump() const { OS << " Value:" << LF->getValue() << " Signed:" << LF->isSigned(); break; } + case MCFragment::FT_Padding: { + const MCPaddingFragment *F = cast<MCPaddingFragment>(this); + OS << "\n "; + OS << " PaddingPoliciesMask:" << F->getPaddingPoliciesMask() + << " IsInsertionPoint:" << F->isInsertionPoint() + << " Size:" << F->getSize(); + OS << "\n "; + OS << " Inst:"; + F->getInst().dump_pretty(OS); + OS << " InstSize:" << F->getInstSize(); + OS << "\n "; + break; + } case MCFragment::FT_SafeSEH: { const MCSafeSEHFragment *F = cast<MCSafeSEHFragment>(this); OS << "\n "; |
