From cf7cfd8208f2ca52e86a9c0fb1fa73d1f5b553e3 Mon Sep 17 00:00:00 2001
From: Reid Kleckner <reid@kleckner.net>
Date: Thu, 15 May 2014 20:41:05 +0000
Subject: [PATCH] Revert "Don't insert lifetime.end markers between a musttail
 call and ret"

This reverts commit r208912.

It was committed accidentally without review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208914 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/InlineFunction.cpp | 14 ++--------
 test/Transforms/Inline/inline-tail.ll   | 36 -------------------------
 2 files changed, 2 insertions(+), 48 deletions(-)

diff --git a/lib/Transforms/Utils/InlineFunction.cpp b/lib/Transforms/Utils/InlineFunction.cpp
index e01d0c38ec4..ab60a400e53 100644
--- a/lib/Transforms/Utils/InlineFunction.cpp
+++ b/lib/Transforms/Utils/InlineFunction.cpp
@@ -755,13 +755,8 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
       }
 
       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, InlineFunctionInfo &IFI,
 
     // 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
diff --git a/test/Transforms/Inline/inline-tail.ll b/test/Transforms/Inline/inline-tail.ll
index b40328e0a27..565491adf5b 100644
--- a/test/Transforms/Inline/inline-tail.ll
+++ b/test/Transforms/Inline/inline-tail.ll
@@ -49,42 +49,6 @@ define void @test_musttail_basic_a(i32* %p) {
   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(
-- 
2.34.1