mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-03-01 01:30:36 +00:00
Revert "Inliner: Handle readonly attribute per argument when adding memcpy"
This reverts commit r193356, it caused PR17781. A reduced test case covering this regression has been added to the test suite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193955 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
parent
42864070b0
commit
16d1098718
@ -338,35 +338,33 @@ static void UpdateCallGraphAfterInlining(CallSite CS,
|
||||
|
||||
/// HandleByValArgument - When inlining a call site that has a byval argument,
|
||||
/// we have to make the implicit memcpy explicit by adding it.
|
||||
static Value *HandleByValArgument(Value *PassedValue,
|
||||
const Argument *ArgumentSignature,
|
||||
Instruction *TheCall,
|
||||
static Value *HandleByValArgument(Value *Arg, Instruction *TheCall,
|
||||
const Function *CalledFunc,
|
||||
InlineFunctionInfo &IFI,
|
||||
unsigned ByValAlignment) {
|
||||
Type *AggTy = cast<PointerType>(PassedValue->getType())->getElementType();
|
||||
Type *AggTy = cast<PointerType>(Arg->getType())->getElementType();
|
||||
|
||||
// If the called function is readonly, then it could not mutate the caller's
|
||||
// copy of the byval'd memory. In this case, it is safe to elide the copy and
|
||||
// temporary.
|
||||
if (CalledFunc->onlyReadsMemory() || ArgumentSignature->onlyReadsMemory()) {
|
||||
if (CalledFunc->onlyReadsMemory()) {
|
||||
// If the byval argument has a specified alignment that is greater than the
|
||||
// passed in pointer, then we either have to round up the input pointer or
|
||||
// give up on this transformation.
|
||||
if (ByValAlignment <= 1) // 0 = unspecified, 1 = no particular alignment.
|
||||
return PassedValue;
|
||||
return Arg;
|
||||
|
||||
// If the pointer is already known to be sufficiently aligned, or if we can
|
||||
// round it up to a larger alignment, then we don't need a temporary.
|
||||
if (getOrEnforceKnownAlignment(PassedValue, ByValAlignment,
|
||||
if (getOrEnforceKnownAlignment(Arg, ByValAlignment,
|
||||
IFI.TD) >= ByValAlignment)
|
||||
return PassedValue;
|
||||
return Arg;
|
||||
|
||||
// Otherwise, we have to make a memcpy to get a safe alignment. This is bad
|
||||
// for code quality, but rarely happens and is required for correctness.
|
||||
}
|
||||
|
||||
LLVMContext &Context = PassedValue->getContext();
|
||||
LLVMContext &Context = Arg->getContext();
|
||||
|
||||
Type *VoidPtrTy = Type::getInt8PtrTy(Context);
|
||||
|
||||
@ -382,7 +380,7 @@ static Value *HandleByValArgument(Value *PassedValue,
|
||||
|
||||
Function *Caller = TheCall->getParent()->getParent();
|
||||
|
||||
Value *NewAlloca = new AllocaInst(AggTy, 0, Align, PassedValue->getName(),
|
||||
Value *NewAlloca = new AllocaInst(AggTy, 0, Align, Arg->getName(),
|
||||
&*Caller->begin()->begin());
|
||||
// Emit a memcpy.
|
||||
Type *Tys[3] = {VoidPtrTy, VoidPtrTy, Type::getInt64Ty(Context)};
|
||||
@ -390,7 +388,7 @@ static Value *HandleByValArgument(Value *PassedValue,
|
||||
Intrinsic::memcpy,
|
||||
Tys);
|
||||
Value *DestCast = new BitCastInst(NewAlloca, VoidPtrTy, "tmp", TheCall);
|
||||
Value *SrcCast = new BitCastInst(PassedValue, VoidPtrTy, "tmp", TheCall);
|
||||
Value *SrcCast = new BitCastInst(Arg, VoidPtrTy, "tmp", TheCall);
|
||||
|
||||
Value *Size;
|
||||
if (IFI.TD == 0)
|
||||
@ -591,14 +589,13 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
|
||||
for (Function::const_arg_iterator I = CalledFunc->arg_begin(),
|
||||
E = CalledFunc->arg_end(); I != E; ++I, ++AI, ++ArgNo) {
|
||||
Value *ActualArg = *AI;
|
||||
const Argument *Arg = I;
|
||||
|
||||
// When byval arguments actually inlined, we need to make the copy implied
|
||||
// by them explicit. However, we don't do this if the callee is readonly
|
||||
// or readnone, because the copy would be unneeded: the callee doesn't
|
||||
// modify the struct.
|
||||
if (CS.isByValArgument(ArgNo)) {
|
||||
ActualArg = HandleByValArgument(ActualArg, Arg, TheCall, CalledFunc, IFI,
|
||||
ActualArg = HandleByValArgument(ActualArg, TheCall, CalledFunc, IFI,
|
||||
CalledFunc->getParamAlignment(ArgNo+1));
|
||||
|
||||
// Calls that we inline may use the new alloca, so we need to clear
|
||||
|
||||
@ -25,7 +25,7 @@ entry:
|
||||
store i64 2, i64* %tmp4, align 4
|
||||
call void @f( %struct.ss* byval %S ) nounwind
|
||||
ret i32 0
|
||||
; CHECK-LABEL: @test1()
|
||||
; CHECK: @test1()
|
||||
; CHECK: %S1 = alloca %struct.ss
|
||||
; CHECK: %S = alloca %struct.ss
|
||||
; CHECK: call void @llvm.memcpy
|
||||
@ -52,7 +52,7 @@ entry:
|
||||
store i64 2, i64* %tmp4, align 4
|
||||
%X = call i32 @f2( %struct.ss* byval %S ) nounwind
|
||||
ret i32 %X
|
||||
; CHECK-LABEL: @test2()
|
||||
; CHECK: @test2()
|
||||
; CHECK: %S = alloca %struct.ss
|
||||
; CHECK-NOT: call void @llvm.memcpy
|
||||
; CHECK: ret i32
|
||||
@ -74,7 +74,7 @@ entry:
|
||||
%S = alloca %struct.ss, align 1 ;; May not be aligned.
|
||||
call void @f3( %struct.ss* byval align 64 %S) nounwind
|
||||
ret void
|
||||
; CHECK-LABEL: @test3()
|
||||
; CHECK: @test3()
|
||||
; CHECK: %S1 = alloca %struct.ss, align 64
|
||||
; CHECK: %S = alloca %struct.ss
|
||||
; CHECK: call void @llvm.memcpy
|
||||
@ -97,35 +97,33 @@ entry:
|
||||
%S = alloca %struct.ss, align 2 ; <%struct.ss*> [#uses=4]
|
||||
%X = call i32 @f4( %struct.ss* byval align 64 %S ) nounwind
|
||||
ret i32 %X
|
||||
; CHECK-LABEL: @test4()
|
||||
; CHECK: @test4()
|
||||
; CHECK: %S = alloca %struct.ss, align 64
|
||||
; CHECK-NOT: call void @llvm.memcpy
|
||||
; CHECK: call void @g3
|
||||
; CHECK: ret i32 4
|
||||
}
|
||||
|
||||
; Inlining a byval struct should NOT cause an explicit copy
|
||||
; into an alloca if the parameter is readonly
|
||||
%struct.S0 = type { i32 }
|
||||
|
||||
define internal i32 @f5(%struct.ss* byval readonly %b) nounwind {
|
||||
@b = global %struct.S0 { i32 1 }, align 4
|
||||
@a = common global i32 0, align 4
|
||||
|
||||
define internal void @f5(%struct.S0* byval nocapture readonly align 4 %p) {
|
||||
entry:
|
||||
%tmp = getelementptr %struct.ss* %b, i32 0, i32 0 ; <i32*> [#uses=2]
|
||||
%tmp1 = load i32* %tmp, align 4 ; <i32> [#uses=1]
|
||||
%tmp2 = add i32 %tmp1, 1 ; <i32> [#uses=1]
|
||||
ret i32 %tmp2
|
||||
store i32 0, i32* getelementptr inbounds (%struct.S0* @b, i64 0, i32 0), align 4
|
||||
%f2 = getelementptr inbounds %struct.S0* %p, i64 0, i32 0
|
||||
%0 = load i32* %f2, align 4
|
||||
store i32 %0, i32* @a, align 4
|
||||
ret void
|
||||
}
|
||||
|
||||
define i32 @test5() nounwind {
|
||||
define i32 @test5() {
|
||||
entry:
|
||||
%S = alloca %struct.ss ; <%struct.ss*> [#uses=4]
|
||||
%tmp1 = getelementptr %struct.ss* %S, i32 0, i32 0 ; <i32*> [#uses=1]
|
||||
store i32 1, i32* %tmp1, align 8
|
||||
%tmp4 = getelementptr %struct.ss* %S, i32 0, i32 1 ; <i64*> [#uses=1]
|
||||
store i64 2, i64* %tmp4, align 4
|
||||
%X = call i32 @f5( %struct.ss* byval %S ) nounwind
|
||||
ret i32 %X
|
||||
; CHECK-LABEL: @test5()
|
||||
; CHECK: %S = alloca %struct.ss
|
||||
; CHECK-NOT: call void @llvm.memcpy
|
||||
; CHECK: ret i32
|
||||
tail call void @f5(%struct.S0* byval align 4 @b)
|
||||
%0 = load i32* @a, align 4
|
||||
ret i32 %0
|
||||
; CHECK: @test5()
|
||||
; CHECK: store i32 0, i32* getelementptr inbounds (%struct.S0* @b, i64 0, i32 0), align 4
|
||||
; CHECK-NOT: load i32* getelementptr inbounds (%struct.S0* @b, i64 0, i32 0), align 4
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user