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Add new "memory use marker" intrinsics. These indicate lifetimes and invariant

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sections of memory objects.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-10-13 07:03:23 +00:00
parent 6e4bdfc229
commit cc271861da
3 changed files with 183 additions and 0 deletions
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36
test/Feature/memorymarkers.ll Normal file
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@@ -0,0 +1,36 @@
; RUN: llvm-as -disable-output < %s
%"struct.std::pair<int,int>" = type { i32, i32 }
declare void @_Z3barRKi(i32*)
declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
declare {}* @llvm.invariant.start(i64, i8* nocapture) readonly nounwind
declare void @llvm.invariant.end({}*, i64, i8* nocapture) nounwind
define i32 @_Z4foo2v() nounwind {
entry:
%x = alloca %"struct.std::pair<int,int>"
%y = bitcast %"struct.std::pair<int,int>"* %x to i8*
;; Constructor starts here (this isn't needed since it is immediately
;; preceded by an alloca, but shown for completeness).
call void @llvm.lifetime.start(i64 8, i8* %y)
%0 = getelementptr %"struct.std::pair<int,int>"* %x, i32 0, i32 0
store i32 4, i32* %0, align 8
%1 = getelementptr %"struct.std::pair<int,int>"* %x, i32 0, i32 1
store i32 5, i32* %1, align 4
;; Constructor has finished here.
%inv = call {}* @llvm.invariant.start(i64 8, i8* %y)
call void @_Z3barRKi(i32* %0) nounwind
%2 = load i32* %0, align 8
;; Destructor is run here.
call void @llvm.invariant.end({}* %inv, i64 8, i8* %y)
;; Destructor is done here.
call void @llvm.lifetime.end(i64 8, i8* %y)
ret i32 %2
}