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MachineSink: make shouldSink a TII target hook

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Some targets may disagree on what they want sunk or not sunk,
so make this a target hook instead of hardcoded.

llvm-svn: 264799
This commit is contained in:
Fiona Glaser
2016-03-29 22:44:57 +00:00
parent 85fba39390
commit 44a2f7a298
2 changed files with 14 additions and 7 deletions
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9
llvm/lib/CodeGen/MachineSink.cpp
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@@ -472,10 +472,6 @@ bool MachineSinking::PostponeSplitCriticalEdge(MachineInstr *MI,
return true;
}
static bool AvoidsSinking(MachineInstr *MI, MachineRegisterInfo *MRI) {
return MI->isInsertSubreg() || MI->isSubregToReg() || MI->isRegSequence();
}
/// collectDebgValues - Scan instructions following MI and collect any
/// matching DBG_VALUEs.
static void collectDebugValues(MachineInstr *MI,
@@ -724,9 +720,8 @@ static bool SinkingPreventsImplicitNullCheck(MachineInstr *MI,
/// instruction out of its current block into a successor.
bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore,
AllSuccsCache &AllSuccessors) {
// Don't sink insert_subreg, subreg_to_reg, reg_sequence. These are meant to
// be close to the source to make it easier to coalesce.
if (AvoidsSinking(MI, MRI))
// Don't sink instructions that the target prefers not to sink.
if (!TII->shouldSink(*MI))
return false;
// Check if it's safe to move the instruction.