From: Andrew Kaylor <andrew.kaylor@intel.com>
Date: Fri, 27 May 2016 22:56:49 +0000 (+0000)
Subject: Update the stack coloring pass to remove lifetime intrinsics in the optnone/opt-bisec... 
X-Git-Tag: android-x86-7.1-r4~32650
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=c465f6c0403034c3715e329ee168d6e24a987952;p=android-x86%2Fexternal-llvm.git

Update the stack coloring pass to remove lifetime intrinsics in the optnone/opt-bisect skip case.

Differential Revision: http://reviews.llvm.org/D20453



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271068 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/StackColoring.cpp b/lib/CodeGen/StackColoring.cpp
index 281836e909d..17c01dc3c3f 100644
--- a/lib/CodeGen/StackColoring.cpp
+++ b/lib/CodeGen/StackColoring.cpp
@@ -963,9 +963,6 @@ void StackColoring::expungeSlotMap(DenseMap<int, int> &SlotRemap,
 }
 
 bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
-  if (skipFunction(*Func.getFunction()))
-    return false;
-
   DEBUG(dbgs() << "********** Stack Coloring **********\n"
                << "********** Function: "
                << ((const Value*)Func.getFunction())->getName() << '\n');
@@ -1005,7 +1002,8 @@ bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
 
   // Don't continue because there are not enough lifetime markers, or the
   // stack is too small, or we are told not to optimize the slots.
-  if (NumMarkers < 2 || TotalSize < 16 || DisableColoring) {
+  if (NumMarkers < 2 || TotalSize < 16 || DisableColoring ||
+      skipFunction(*Func.getFunction())) {
     DEBUG(dbgs()<<"Will not try to merge slots.\n");
     return removeAllMarkers();
   }
diff --git a/test/Feature/optnone-llc.ll b/test/Feature/optnone-llc.ll
index 8abcd09eea5..a03757359c8 100644
--- a/test/Feature/optnone-llc.ll
+++ b/test/Feature/optnone-llc.ll
@@ -46,7 +46,6 @@ attributes #0 = { optnone noinline }
 ; LLC-Ox-DAG: Skipping pass 'Machine Copy Propagation Pass'
 ; LLC-Ox-DAG: Skipping pass 'Machine Instruction Scheduler'
 ; LLC-Ox-DAG: Skipping pass 'Machine Loop Invariant Code Motion'
-; LLC-Ox-DAG: Skipping pass 'Merge disjoint stack slots'
 ; LLC-Ox-DAG: Skipping pass 'Optimize machine instruction PHIs'
 ; LLC-Ox-DAG: Skipping pass 'Peephole Optimizations'
 ; LLC-Ox-DAG: Skipping pass 'Post{{.*}}RA{{.*}}{{[Ss]}}cheduler'
diff --git a/test/Other/opt-bisect-legacy-pass-manager.ll b/test/Other/opt-bisect-legacy-pass-manager.ll
index 0e528ea4b32..6677c264e9c 100644
--- a/test/Other/opt-bisect-legacy-pass-manager.ll
+++ b/test/Other/opt-bisect-legacy-pass-manager.ll
@@ -154,3 +154,25 @@ bb.true:
 bb.false:
   ret i32 0
 }
+
+; This function is here to verify that opt-bisect can skip all passes for
+; functions that contain lifetime intrinsics.
+define void @f4() {
+entry:
+  %i = alloca i32, align 4
+  %tmp = bitcast i32* %i to i8*
+  call void @llvm.lifetime.start(i64 4, i8* %tmp)
+  br label %for.cond
+
+for.cond:
+  br i1 undef, label %for.body, label %for.end
+
+for.body:
+  br label %for.cond
+
+for.end:
+  ret void
+}
+
+declare void @llvm.lifetime.start(i64, i8* nocapture)
+