[ARM] Reverse PostRASched subtarget feature logic
Replace the UsePostRAScheduler SubtargetFeature with
DisablePostRAScheduler, which is then used by Swift and Cyclone.
This patch maintains enabling PostRA scheduling for other Thumb2
capable cores and/or for functions which are being compiled in Arm
mode.
Differential Revision: https://reviews.llvm.org/D37055
llvm-svn: 312226
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
index 992d2a3..e440957 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -366,15 +366,10 @@
// This overrides the PostRAScheduler bit in the SchedModel for any CPU.
bool ARMSubtarget::enablePostRAScheduler() const {
- if (usePostRAScheduler())
- return true;
- if (SchedModel.PostRAScheduler)
- return true;
- // No need for PostRA scheduling on subtargets where we use the
- // MachineScheduler.
- if (useMachineScheduler())
+ if (disablePostRAScheduler())
return false;
- return (!isThumb() || hasThumb2());
+ // Don't reschedule potential IT blocks.
+ return !isThumb1Only();
}
bool ARMSubtarget::enableAtomicExpand() const { return hasAnyDataBarrier(); }