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CodeGen: Move check of EnablePostRAScheduler to avoid disabling antidependency breaker

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Previously, specifying -post-RA-scheduler=true had the side effect of
disabling the antidependency breaker, yielding different behavior than
if the post-RA-scheduler was enabled via the scheduling model.

Differential Revision: http://reviews.llvm.org/D20186

llvm-svn: 270077
This commit is contained in:
Mitch Bodart 2016-05-19 16:40:49 +00:00
parent bcbd39476b
commit c83bd382db
1 changed files with 12 additions and 11 deletions
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23
lib/CodeGen/PostRASchedulerList.cpp
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@ -103,6 +103,7 @@ namespace {
bool runOnMachineFunction(MachineFunction &Fn) override;
private:
bool enablePostRAScheduler(
const TargetSubtargetInfo &ST, CodeGenOpt::Level OptLevel,
TargetSubtargetInfo::AntiDepBreakMode &Mode,
@ -269,6 +270,11 @@ bool PostRAScheduler::enablePostRAScheduler(
TargetSubtargetInfo::RegClassVector &CriticalPathRCs) const {
Mode = ST.getAntiDepBreakMode();
ST.getCriticalPathRCs(CriticalPathRCs);
// Check for explicit enable/disable of post-ra scheduling.
if (EnablePostRAScheduler.getPosition() > 0)
return EnablePostRAScheduler;
return ST.enablePostRAScheduler() &&
OptLevel >= ST.getOptLevelToEnablePostRAScheduler();
}
@ -284,20 +290,15 @@ bool PostRAScheduler::runOnMachineFunction(MachineFunction &Fn) {
RegClassInfo.runOnMachineFunction(Fn);
// Check for explicit enable/disable of post-ra scheduling.
TargetSubtargetInfo::AntiDepBreakMode AntiDepMode =
TargetSubtargetInfo::ANTIDEP_NONE;
SmallVector<const TargetRegisterClass*, 4> CriticalPathRCs;
if (EnablePostRAScheduler.getPosition() > 0) {
if (!EnablePostRAScheduler)
return false;
} else {
// Check that post-RA scheduling is enabled for this target.
// This may upgrade the AntiDepMode.
if (!enablePostRAScheduler(Fn.getSubtarget(), PassConfig->getOptLevel(),
AntiDepMode, CriticalPathRCs))
return false;
}
// Check that post-RA scheduling is enabled for this target.
// This may upgrade the AntiDepMode.
if (!enablePostRAScheduler(Fn.getSubtarget(), PassConfig->getOptLevel(),
AntiDepMode, CriticalPathRCs))
return false;
// Check for antidep breaking override...
if (EnableAntiDepBreaking.getPosition() > 0) {