[Stackmaps] Remove the liveness calculation for stackmap intrinsics.

There is no need to calculate the liveness information for stackmaps. The
liveness information is still available for the patchpoint intrinsic and
that is also the intended usage model.

Related to <rdar://problem/17473725>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211816 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 5 insertions, 11 deletions

diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index 9568e238a2..bdcde102da 100644
--- a/lib/CodeGen/Passes.cpp
+++ b/lib/CodeGen/Passes.cpp
@@ -31,7 +31,6 @@
 using namespace llvm;
 
 namespace llvm {
-extern cl::opt<bool> EnableStackMapLiveness;
 extern cl::opt<bool> EnablePatchPointLiveness;
 }
 
@@ -566,7 +565,7 @@ void TargetPassConfig::addMachinePasses() {
   if (addPreEmitPass())
     printAndVerify("After PreEmit passes");
 
-  if (EnableStackMapLiveness || EnablePatchPointLiveness)
+  if (EnablePatchPointLiveness)
     addPass(&StackMapLivenessID);
 }
 
diff --git a/lib/CodeGen/StackMapLivenessAnalysis.cpp b/lib/CodeGen/StackMapLivenessAnalysis.cpp
index 4dd87ddb88..16a1babd4d 100644
--- a/lib/CodeGen/StackMapLivenessAnalysis.cpp
+++ b/lib/CodeGen/StackMapLivenessAnalysis.cpp
@@ -28,8 +28,6 @@ using namespace llvm;
 #define DEBUG_TYPE "stackmaps"
 
 namespace llvm {
-cl::opt<bool> EnableStackMapLiveness("enable-stackmap-liveness",
-  cl::Hidden, cl::desc("Enable StackMap Liveness Analysis Pass"));
 cl::opt<bool> EnablePatchPointLiveness("enable-patchpoint-liveness",
   cl::Hidden, cl::desc("Enable PatchPoint Liveness Analysis Pass"));
 }
@@ -68,9 +66,8 @@ bool StackMapLiveness::runOnMachineFunction(MachineFunction &_MF) {
   TRI = MF->getTarget().getRegisterInfo();
   ++NumStackMapFuncVisited;
 
-  // Skip this function if there are no stackmaps or patchpoints to process.
-  if (!((MF->getFrameInfo()->hasStackMap() && EnableStackMapLiveness) ||
-        (MF->getFrameInfo()->hasPatchPoint() && EnablePatchPointLiveness))) {
+  // Skip this function if there are no patchpoints to process.
+  if (!(MF->getFrameInfo()->hasPatchPoint() && EnablePatchPointLiveness)) {
     ++NumStackMapFuncSkipped;
     return false;
   }
@@ -88,13 +85,11 @@ bool StackMapLiveness::calculateLiveness() {
     LiveRegs.addLiveOuts(MBBI);
     bool HasStackMap = false;
     // Reverse iterate over all instructions and add the current live register
-    // set to an instruction if we encounter a stackmap or patchpoint
-    // instruction.
+    // set to an instruction if we encounter a patchpoint instruction.
     for (MachineBasicBlock::reverse_iterator I = MBBI->rbegin(),
          E = MBBI->rend(); I != E; ++I) {
       int Opc = I->getOpcode();
-      if ((EnableStackMapLiveness && (Opc == TargetOpcode::STACKMAP)) ||
-          (EnablePatchPointLiveness && (Opc == TargetOpcode::PATCHPOINT))) {
+      if (Opc == TargetOpcode::PATCHPOINT) {
         addLiveOutSetToMI(*I);
         HasChanged = true;
         HasStackMap = true;