From: David L. Jones <dlj@google.com>
Date: Tue, 15 Oct 2019 04:32:07 +0000 (+0000)
Subject: Revert [SROA] Reuse existing lifetime markers if possible
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6bfdebb412d87890c9c727a5975aed9cda66bf33;p=platform%2Fupstream%2Fllvm.git

Revert [SROA] Reuse existing lifetime markers if possible

This reverts r374692 (git commit 92694eba933ef4ea0b1b6377809ff266df37d61b)

Reproducer sent to commit thread on llvm-commits.

llvm-svn: 374859
---

diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
index a36b3c5..4b81683 100644
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -3072,13 +3072,6 @@ private:
     LLVM_DEBUG(dbgs() << "    original: " << II << "\n");
     assert(II.getArgOperand(1) == OldPtr);
 
-    bool EntireRange = (NewBeginOffset == NewAllocaBeginOffset &&
-                        NewEndOffset == NewAllocaEndOffset);
-
-    // If the new lifetime marker would not differ from the old, just keep it.
-    if (&OldAI == &NewAI && EntireRange)
-      return true;
-
     // Record this instruction for deletion.
     Pass.DeadInsts.insert(&II);
 
@@ -3089,7 +3082,8 @@ private:
     // promoted, but PromoteMemToReg doesn't handle that case.)
     // FIXME: Check whether the alloca is promotable before dropping the
     // lifetime intrinsics?
-    if (!EntireRange)
+    if (NewBeginOffset != NewAllocaBeginOffset ||
+        NewEndOffset != NewAllocaEndOffset)
       return true;
 
     ConstantInt *Size =
diff --git a/llvm/test/Transforms/SROA/reuse_lifetime_markers.ll b/llvm/test/Transforms/SROA/reuse_lifetime_markers.ll
deleted file mode 100644
index 0bfaf6e..0000000
--- a/llvm/test/Transforms/SROA/reuse_lifetime_markers.ll
+++ /dev/null
@@ -1,69 +0,0 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -sroa -S | FileCheck %s
-;
-; Make sure we reuse the lifetime marker and do not create a new one that looks the same but without the call site attributes.
-target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
-
-; Function Attrs: argmemonly nounwind willreturn
-declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #0
-
-; Function Attrs: argmemonly nounwind willreturn
-declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
-
-define hidden void @old_markers() {
-;
-; CHECK-LABEL: define {{[^@]+}}@old_markers(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[VV_SROA_4:%.*]] = alloca [3 x i32*]
-; CHECK-NEXT:    [[VV_SROA_4_0__SROA_CAST61:%.*]] = bitcast [3 x i32*]* [[VV_SROA_4]] to i8*
-; CHECK-NEXT:    [[VV_SROA_4_0__SROA_CAST94:%.*]] = bitcast [3 x i32*]* [[VV_SROA_4]] to i8*
-; CHECK-NEXT:    call void @llvm.lifetime.start.p0i8(i64 24, i8* nonnull align 8 dereferenceable(24) [[VV_SROA_4_0__SROA_CAST94]])
-; CHECK-NEXT:    br i1 undef, label [[DO_BODY:%.*]], label [[IF_END31:%.*]]
-; CHECK:       do.body:
-; CHECK-NEXT:    ret void
-; CHECK:       if.end31:
-; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nonnull align 8 dereferenceable(24) [[VV_SROA_4_0__SROA_CAST61]], i8* noalias nonnull align 8 undef, i64 24, i1 false)
-; CHECK-NEXT:    unreachable
-;
-entry:
-  %vv.sroa.4 = alloca [3 x i32*]
-  %vv.sroa.4.0..sroa_cast61 = bitcast [3 x i32*]* %vv.sroa.4 to i8*
-  %vv.sroa.4.0..sroa_cast94 = bitcast [3 x i32*]* %vv.sroa.4 to i8*
-  call void @llvm.lifetime.start.p0i8(i64 24, i8* nonnull align 8 dereferenceable(24) %vv.sroa.4.0..sroa_cast94)
-  br i1 undef, label %do.body, label %if.end31
-
-do.body:                                          ; preds = %entry
-  ret void
-
-if.end31:                                         ; preds = %entry
-  call void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nonnull align 8 dereferenceable(24) %vv.sroa.4.0..sroa_cast61, i8* noalias nonnull align 8 undef, i64 24, i1 false)
-  unreachable
-}
-
-define hidden void @new_markers() {
-;
-; CHECK-LABEL: define {{[^@]+}}@new_markers(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[VV_SROA_4:%.*]] = alloca [3 x i32*]
-; CHECK-NEXT:    [[VV_SROA_4_0__SROA_CAST61:%.*]] = bitcast [3 x i32*]* [[VV_SROA_4]] to i8*
-; CHECK-NEXT:    br i1 undef, label [[DO_BODY:%.*]], label [[IF_END31:%.*]]
-; CHECK:       do.body:
-; CHECK-NEXT:    ret void
-; CHECK:       if.end31:
-; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nonnull align 8 dereferenceable(24) [[VV_SROA_4_0__SROA_CAST61]], i8* noalias nonnull align 8 undef, i64 24, i1 false)
-; CHECK-NEXT:    unreachable
-;
-entry:
-  %vv.sroa.4 = alloca [3 x i32*]
-  %vv.sroa.4.0..sroa_cast61 = bitcast [3 x i32*]* %vv.sroa.4 to i8*
-  %vv.sroa.4.0..sroa_cast94 = bitcast [3 x i32*]* %vv.sroa.4 to i8*
-  call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull align 8 dereferenceable(24) %vv.sroa.4.0..sroa_cast94)
-  br i1 undef, label %do.body, label %if.end31
-
-do.body:                                          ; preds = %entry
-  ret void
-
-if.end31:                                         ; preds = %entry
-  call void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nonnull align 8 dereferenceable(24) %vv.sroa.4.0..sroa_cast61, i8* noalias nonnull align 8 undef, i64 24, i1 false)
-  unreachable
-}