[llvm] r208914 - Revert "Don't insert lifetime.end markers between a musttail call and ret"

[Reid Kleckner]

Author: rnk
Date: Thu May 15 15:41:05 2014
New Revision: 208914

URL: http://llvm.org/viewvc/llvm-project?rev=208914&view=rev
Log:
Revert "Don't insert lifetime.end markers between a musttail call and ret"

This reverts commit r208912.

It was committed accidentally without review.

Modified:
    llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
    llvm/trunk/test/Transforms/Inline/inline-tail.ll

Modified: llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp?rev=208914&r1=208913&r2=208914&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp Thu May 15 15:41:05 2014
@@ -755,13 +755,8 @@ bool llvm::InlineFunction(CallSite CS, I
       }
 
       builder.CreateLifetimeStart(AI, AllocaSize);
-      for (ReturnInst *RI : Returns) {
-        // Don't insert llvm.lifetime.end calls between a musttail call and a
-        // return.  The return kills all local allocas.
-        if (InlinedMustTailCalls && getPrecedingMustTailCall(RI))
-          continue;
+      for (ReturnInst *RI : Returns)
         IRBuilder<>(RI).CreateLifetimeEnd(AI, AllocaSize);
-      }
     }
   }
 
@@ -779,13 +774,8 @@ bool llvm::InlineFunction(CallSite CS, I
 
     // Insert a call to llvm.stackrestore before any return instructions in the
     // inlined function.
-    for (ReturnInst *RI : Returns) {
-      // Don't insert llvm.stackrestore calls between a musttail call and a
-      // return.  The return will restore the stack pointer.
-      if (InlinedMustTailCalls && getPrecedingMustTailCall(RI))
-        continue;
+    for (ReturnInst *RI : Returns)
       IRBuilder<>(RI).CreateCall(StackRestore, SavedPtr);
-    }
   }
 
   // If we are inlining for an invoke instruction, we must make sure to rewrite

Modified: llvm/trunk/test/Transforms/Inline/inline-tail.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/Inline/inline-tail.ll?rev=208914&r1=208913&r2=208914&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/Inline/inline-tail.ll (original)
+++ llvm/trunk/test/Transforms/Inline/inline-tail.ll Thu May 15 15:41:05 2014
@@ -49,42 +49,6 @@ define void @test_musttail_basic_a(i32*
   ret void
 }
 
-; Don't insert lifetime end markers here, the lifetime is trivially over due
-; the return.
-; CHECK: define void @test_byval_a(
-; CHECK: musttail call void @test_byval_c(
-; CHECK-NEXT: ret void
-
-declare void @test_byval_c(i32* byval %p)
-define internal void @test_byval_b(i32* byval %p) {
-  musttail call void @test_byval_c(i32* byval %p)
-  ret void
-}
-define void @test_byval_a(i32* byval %p) {
-  musttail call void @test_byval_b(i32* byval %p)
-  ret void
-}
-
-; Don't insert a stack restore, we're about to return.
-; CHECK: define void @test_dynalloca_a(
-; CHECK: call i8* @llvm.stacksave(
-; CHECK: alloca i8, i32 %n
-; CHECK: musttail call void @test_dynalloca_c(
-; CHECK-NEXT: ret void
-
-declare void @escape(i8* %buf)
-declare void @test_dynalloca_c(i32* byval %p, i32 %n)
-define internal void @test_dynalloca_b(i32* byval %p, i32 %n) alwaysinline {
-  %buf = alloca i8, i32 %n              ; dynamic alloca
-  call void @escape(i8* %buf)           ; escape it
-  musttail call void @test_dynalloca_c(i32* byval %p, i32 %n)
-  ret void
-}
-define void @test_dynalloca_a(i32* byval %p, i32 %n) {
-  musttail call void @test_dynalloca_b(i32* byval %p, i32 %n)
-  ret void
-}
-
 ; We can't merge the returns.
 ; CHECK: define void @test_multiret_a(
 ; CHECK: musttail call void @test_multiret_c(