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Revert [SROA] Reuse existing lifetime markers if possible 

This reverts r374692 (git commit 92694eba93)

Reproducer sent to commit thread on llvm-commits.

llvm-svn: 374859
This commit is contained in:
David L. Jones 2019-10-15 04:32:07 +00:00
parent 078bec6c48
commit 6bfdebb412
2 changed files with 2 additions and 77 deletions
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10
llvm/lib/Transforms/Scalar/SROA.cpp
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@ -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 =

69
llvm/test/Transforms/SROA/reuse_lifetime_markers.ll
View File

@ -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
}