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Various comment fixes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78139 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-08-05 01:19:01 +00:00
parent 5b0d72e850
commit a5225add0d
1 changed files with 8 additions and 3 deletions
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11
lib/CodeGen/MachineSink.cpp
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@ -7,7 +7,12 @@
//
//===----------------------------------------------------------------------===//
//
// This pass
// This pass moves instructions into successor blocks, when possible, so that
// they aren't executed on paths where their results aren't needed.
//
// This pass is not intended to be a replacement or a complete alternative
// for an LLVM-IR-level sinking pass. It is only designed to sink simple
// constructs that are not exposed before lowering and instruction selection.
//
//===----------------------------------------------------------------------===//
@ -31,7 +36,7 @@ namespace {
const TargetInstrInfo *TII;
MachineFunction *CurMF; // Current MachineFunction
MachineRegisterInfo *RegInfo; // Machine register information
MachineDominatorTree *DT; // Machine dominator tree for the current Loop
MachineDominatorTree *DT; // Machine dominator tree
public:
static char ID; // Pass identification
@ -152,7 +157,7 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
// also sink them down before their first use in the block. This xform has to
// be careful not to *increase* register pressure though, e.g. sinking
// "x = y + z" down if it kills y and z would increase the live ranges of y
// and z only the shrink the live range of x.
// and z and only shrink the live range of x.
// Loop over all the operands of the specified instruction. If there is
// anything we can't handle, bail out.