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Don't trivially delete unused calls to llvm.invariant.start. This allows

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llvm.invariant.start to be used without necessarily being paired with a call
to llvm.invariant.end.  If you run the entire optimization pipeline then such
calls are in fact deleted (adce does it), but that's actually a good thing since
we probably do want them to be zapped late in the game.  There should really be
an integration test that checks that the llvm.invariant.start call lasts long
enough that all passes that do interesting things with it get to do their stuff
before it is deleted.  But since no passes do anything interesting with it yet
this will have to wait for later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86840 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2009-11-11 15:34:13 +00:00
parent 012397489b
commit a3da922a27
3 changed files with 41 additions and 0 deletions
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22
include/llvm/IntrinsicInst.h
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@ -320,6 +320,28 @@ namespace llvm {
}
};
/// MemoryUseIntrinsic - This is the common base class for the memory use
/// marker intrinsics.
///
struct MemoryUseIntrinsic : public IntrinsicInst {
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const MemoryUseIntrinsic *) { return true; }
static inline bool classof(const IntrinsicInst *I) {
switch (I->getIntrinsicID()) {
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
case Intrinsic::invariant_start:
case Intrinsic::invariant_end:
return true;
default: return false;
}
}
static inline bool classof(const Value *V) {
return isa<IntrinsicInst>(V) && classof(cast<IntrinsicInst>(V));
}
};
}
#endif

3
lib/Transforms/Utils/Local.cpp
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@ -252,6 +252,9 @@ bool llvm::isInstructionTriviallyDead(Instruction *I) {
// We don't want debug info removed by anything this general.
if (isa<DbgInfoIntrinsic>(I)) return false;
// Likewise for memory use markers.
if (isa<MemoryUseIntrinsic>(I)) return false;
if (!I->mayHaveSideEffects()) return true;
// Special case intrinsics that "may have side effects" but can be deleted

16
test/Transforms/InstCombine/invariant.ll Normal file
View File

@ -0,0 +1,16 @@
; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @g(i8*)
declare { }* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly
define i8 @f() {
%a = alloca i8 ; <i8*> [#uses=4]
store i8 0, i8* %a
%i = call { }* @llvm.invariant.start(i64 1, i8* %a) ; <{ }*> [#uses=0]
; CHECK: call { }* @llvm.invariant.start
call void @g(i8* %a)
%r = load i8* %a ; <i8> [#uses=1]
ret i8 %r
}