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Revert "[CodeExtractor] Don't create bitcasts when inserting lifetime markers (NFCI)" 

This reverts commit 26ee8aff2b.

It's necessary to insert bitcast the pointer operand of a lifetime
marker if it has an opaque pointer type.

rdar://70560161
This commit is contained in:
Vedant Kumar 2020-10-22 11:11:12 -07:00
parent 36ce915ac5
commit 099bffe7f7
5 changed files with 45 additions and 21 deletions
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35
llvm/lib/Transforms/Utils/CodeExtractor.cpp
View File

@ -1025,21 +1025,32 @@ static void insertLifetimeMarkersSurroundingCall(
Module *M, ArrayRef<Value *> LifetimesStart, ArrayRef<Value *> LifetimesEnd,
CallInst *TheCall) {
LLVMContext &Ctx = M->getContext();
auto Int8PtrTy = Type::getInt8PtrTy(Ctx);
auto NegativeOne = ConstantInt::getSigned(Type::getInt64Ty(Ctx), -1);
Instruction *Term = TheCall->getParent()->getTerminator();
// The memory argument to a lifetime marker must be a i8*. Cache any bitcasts
// needed to satisfy this requirement so they may be reused.
DenseMap<Value *, Value *> Bitcasts;
// Emit lifetime markers for the pointers given in \p Objects. Insert the
// markers before the call if \p InsertBefore, and after the call otherwise.
auto insertMarkers = [&](Intrinsic::ID IID, ArrayRef<Value *> Objects,
auto insertMarkers = [&](Function *MarkerFunc, ArrayRef<Value *> Objects,
bool InsertBefore) {
for (Value *Mem : Objects) {
assert((!isa<Instruction>(Mem) || cast<Instruction>(Mem)->getFunction() ==
TheCall->getFunction()) &&
"Input memory not defined in original function");
assert(Mem->getType()->isPointerTy() && "Expected pointer to memory");
Function *MarkerFunc =
llvm::Intrinsic::getDeclaration(M, IID, Mem->getType());
auto Marker = CallInst::Create(MarkerFunc, {NegativeOne, Mem});
Value *&MemAsI8Ptr = Bitcasts[Mem];
if (!MemAsI8Ptr) {
if (Mem->getType() == Int8PtrTy)
MemAsI8Ptr = Mem;
else
MemAsI8Ptr =
CastInst::CreatePointerCast(Mem, Int8PtrTy, "lt.cast", TheCall);
}
auto Marker = CallInst::Create(MarkerFunc, {NegativeOne, MemAsI8Ptr});
if (InsertBefore)
Marker->insertBefore(TheCall);
else
@ -1047,9 +1058,17 @@ static void insertLifetimeMarkersSurroundingCall(
}
};
insertMarkers(Intrinsic::lifetime_start, LifetimesStart,
/*InsertBefore=*/true);
insertMarkers(Intrinsic::lifetime_end, LifetimesEnd, /*InsertBefore=*/false);
if (!LifetimesStart.empty()) {
auto StartFn = llvm::Intrinsic::getDeclaration(
M, llvm::Intrinsic::lifetime_start, Int8PtrTy);
insertMarkers(StartFn, LifetimesStart, /*InsertBefore=*/true);
}
if (!LifetimesEnd.empty()) {
auto EndFn = llvm::Intrinsic::getDeclaration(
M, llvm::Intrinsic::lifetime_end, Int8PtrTy);
insertMarkers(EndFn, LifetimesEnd, /*InsertBefore=*/false);
}
}
/// emitCallAndSwitchStatement - This method sets up the caller side by adding

5
llvm/test/Transforms/CodeExtractor/PartialInlineInvokeProducesOutVal.ll
View File

@ -26,10 +26,11 @@ bb5: ; preds = %bb4, %bb1, %bb
; CHECK-LABEL: bb:
; CHECK-NEXT: [[CALL26LOC:%.*]] = alloca i8*
; CHECK-LABEL: codeRepl.i:
; CHECK-NEXT: call void @llvm.lifetime.start.p0p0i8(i64 -1, i8** [[CALL26LOC]])
; CHECK-NEXT: %lt.cast.i = bitcast i8** [[CALL26LOC]] to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* %lt.cast.i)
; CHECK-NEXT: call void @bar.1.bb1(i8** [[CALL26LOC]])
; CHECK-NEXT: %call26.reload.i = load i8*, i8** [[CALL26LOC]]
; CHECK-NEXT: call void @llvm.lifetime.end.p0p0i8(i64 -1, i8** [[CALL26LOC]])
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 -1, i8* %lt.cast.i)
define i8* @dummy_caller(i32 %arg) {
bb:
%tmp = tail call i8* @bar(i32 %arg)

8
llvm/test/Transforms/HotColdSplit/lifetime-markers-on-inputs-1.ll
View File

@ -29,8 +29,10 @@ normalPath:
ret void
; CHECK-LABEL: codeRepl:
; CHECK: call void @llvm.lifetime.start.p0i256(i64 -1, i256* %local1)
; CHECK-NEXT: call void @llvm.lifetime.start.p0i256(i64 -1, i256* %local2)
; CHECK: [[local1_cast:%.*]] = bitcast i256* %local1 to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local1_cast]])
; CHECK-NEXT: [[local2_cast:%.*]] = bitcast i256* %local2 to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local2_cast]])
; CHECK-NEXT: call i1 @foo.cold.1(i8* %local1_cast, i8* %local2_cast)
; CHECK-NEXT: br i1
@ -59,4 +61,4 @@ outlinedPathExit:
}
; CHECK-LABEL: define {{.*}}@foo.cold.1(
; CHECK-NOT: call void @llvm.lifetime
; CHECK-NOT: @llvm.lifetime

15
llvm/test/Transforms/HotColdSplit/lifetime-markers-on-inputs-2.ll
View File

@ -37,12 +37,13 @@ declare void @use(i8*)
define void @only_lifetime_start_is_cold() {
; CHECK-LABEL: @only_lifetime_start_is_cold(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256, align 8
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
; CHECK-NEXT: br i1 undef, label [[CODEREPL:%.*]], label [[NO_EXTRACT1:%.*]]
; CHECK: codeRepl:
; CHECK-NEXT: call void @llvm.lifetime.start.p0i256(i64 -1, i256* [[LOCAL1]])
; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @only_lifetime_start_is_cold.cold.1(i8* [[LOCAL1_CAST]]) [[ATTR3:#.*]]
; CHECK-NEXT: [[LT_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[LT_CAST]])
; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @only_lifetime_start_is_cold.cold.1(i8* [[LOCAL1_CAST]]) #3
; CHECK-NEXT: br i1 [[TARGETBLOCK]], label [[NO_EXTRACT1]], label [[EXIT:%.*]]
; CHECK: no-extract1:
; CHECK-NEXT: br label [[EXIT]]
@ -97,7 +98,7 @@ exit:
define void @only_lifetime_end_is_cold() {
; CHECK-LABEL: @only_lifetime_end_is_cold(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256, align 8
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[LOCAL1_CAST]])
; CHECK-NEXT: br i1 undef, label [[NO_EXTRACT1:%.*]], label [[CODEREPL:%.*]]
@ -105,7 +106,7 @@ define void @only_lifetime_end_is_cold() {
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* [[LOCAL1_CAST]])
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: codeRepl:
; CHECK-NEXT: call void @only_lifetime_end_is_cold.cold.1(i8* [[LOCAL1_CAST]]) [[ATTR3]]
; CHECK-NEXT: call void @only_lifetime_end_is_cold.cold.1(i8* [[LOCAL1_CAST]]) #3
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
@ -137,7 +138,7 @@ exit:
define void @do_not_lift_lifetime_end() {
; CHECK-LABEL: @do_not_lift_lifetime_end(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256, align 8
; CHECK-NEXT: [[LOCAL1:%.*]] = alloca i256
; CHECK-NEXT: [[LOCAL1_CAST:%.*]] = bitcast i256* [[LOCAL1]] to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* [[LOCAL1_CAST]])
; CHECK-NEXT: br label [[HEADER:%.*]]
@ -145,7 +146,7 @@ define void @do_not_lift_lifetime_end() {
; CHECK-NEXT: call void @use(i8* [[LOCAL1_CAST]])
; CHECK-NEXT: br i1 undef, label [[EXIT:%.*]], label [[CODEREPL:%.*]]
; CHECK: codeRepl:
; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @do_not_lift_lifetime_end.cold.1(i8* [[LOCAL1_CAST]]) [[ATTR3]]
; CHECK-NEXT: [[TARGETBLOCK:%.*]] = call i1 @do_not_lift_lifetime_end.cold.1(i8* [[LOCAL1_CAST]]) #3
; CHECK-NEXT: br i1 [[TARGETBLOCK]], label [[HEADER]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void

3
llvm/test/Transforms/HotColdSplit/split-phis-in-exit-blocks.ll
View File

@ -12,7 +12,8 @@ target triple = "x86_64-apple-macosx10.14.0"
; CHECK-NEXT: ]
;
; CHECK: codeRepl:
; CHECK: lifetime.start
; CHECK-NEXT: bitcast
; CHECK-NEXT: lifetime.start
; CHECK-NEXT: call void @pluto.cold.1(i1* %tmp8.ce.loc)
; CHECK-NEXT: %tmp8.ce.reload = load i1, i1* %tmp8.ce.loc
; CHECK-NEXT: lifetime.end