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Teach basicaa that 'byval' arguments define a new memory location that

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can't be aliased to other known objects.  This allows us to know that byval 
pointer args don't alias globals, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-01-24 18:00:32 +00:00
parent de6fa5f25f
commit fd68750038
2 changed files with 52 additions and 34 deletions
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18
test/Analysis/BasicAA/byval.ll Normal file
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; RUN: llvm-as < %s | opt -gvn | llvm-dis | grep {ret i32 1}
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin8"
%struct.x = type { i32, i32, i32, i32 }
@g = weak global i32 0 ; <i32*> [#uses=1]
define i32 @foo(%struct.x* byval %a) nounwind {
entry:
%tmp1 = tail call i32 (...)* @bar( %struct.x* %a ) nounwind ; <i32> [#uses=0]
%tmp2 = getelementptr %struct.x* %a, i32 0, i32 0 ; <i32*> [#uses=2]
store i32 1, i32* %tmp2, align 4
store i32 2, i32* @g, align 4
%tmp4 = load i32* %tmp2, align 4 ; <i32> [#uses=1]
ret i32 %tmp4
}
declare i32 @bar(...)