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Make adding nocapture a bit stronger. FreeInst is nocapture. Also,

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functions that don't write can't leak a pointer except through 
the return value, so a void readonly function is implicitly nocapture.

Test these, and add a test that verifies that f1 calling f2 with an 
otherwise dead pointer gets both of them marked nocapture.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61552 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-01-02 03:46:56 +00:00
parent b9b3a702c4
commit 6b05686283
2 changed files with 50 additions and 4 deletions
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24
test/Transforms/FunctionAttrs/2008-12-31-NoCapture.ll
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@@ -1,5 +1,5 @@
; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | not grep {nocapture *%%q}
; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | grep {nocapture *%%p} | count 3
; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | grep {nocapture *%%p} | count 8
@g = global i32* null ; <i32**> [#uses=1]
define i32* @c1(i32* %q) {
@@ -62,3 +62,25 @@ define void @nc3(void ()* %p) {
call void %p()
ret void
}
declare void @external(i8*) readonly
define void @nc4(i8* %p) {
call void @external(i8* %p)
ret void
}
define void @nc5(void (i8*)* %f, i8* %p) {
call void %f(i8* %p) readonly
call void %f(i8* nocapture %p)
ret void
}
define void @nc6(i8* %p) {
call void @nc7(i8* %p)
ret void
}
define void @nc7(i8* %p) {
call void @nc6(i8* %p)
ret void
}