[WebAssembly] Speed up LiveIntervals updating.
Use the more specific LiveInterval::removeSegment instead of
LiveInterval::shrinkToUses when we know the specific range that's
being removed.
llvm-svn: 270463
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
index 4a0359a..12431be 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
@@ -126,7 +126,9 @@
bool &Read, bool &Write, bool &Effects, bool &StackPointer) {
assert(!MI->isPosition());
assert(!MI->isTerminator());
- assert(!MI->isDebugValue());
+
+ if (MI->isDebugValue())
+ return;
// Check for loads.
if (MI->mayLoad() && !MI->isInvariantLoad(&AA))
@@ -255,7 +257,7 @@
const VNInfo *DefVNI = LI.getVNInfoAt(
LIS.getInstructionIndex(*Def).getRegSlot());
assert(DefVNI);
- for (auto I : MRI.use_operands(Reg)) {
+ for (auto I : MRI.use_nodbg_operands(Reg)) {
const auto &Result = LI.Query(LIS.getInstructionIndex(*I.getParent()));
if (Result.valueIn() == DefVNI) {
if (!Result.isKill())
@@ -458,8 +460,9 @@
// Tell LiveIntervals about the changes to the old register.
LiveInterval &LI = LIS.getInterval(Reg);
- LIS.removeVRegDefAt(LI, LIS.getInstructionIndex(*Def).getRegSlot());
- ShrinkToUses(LI, LIS);
+ LI.removeSegment(LIS.getInstructionIndex(*Def).getRegSlot(),
+ LIS.getInstructionIndex(*Op.getParent()).getRegSlot(),
+ /*RemoveDeadValNo=*/true);
MFI.stackifyVReg(NewReg);
@@ -528,8 +531,8 @@
/// DefReg = INST ... // Def (to become the new Insert)
/// TeeReg, Reg = TEE_LOCAL_... DefReg
/// INST ..., TeeReg, ... // Insert
-/// INST ..., NewReg, ...
-/// INST ..., NewReg, ...
+/// INST ..., Reg, ...
+/// INST ..., Reg, ...
///
/// with DefReg and TeeReg stackified. This eliminates a get_local from the
/// resulting code.