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Add a testcase to demonstrate the problem where phi translation is 

ignored for clobbering partial-alias loads.

llvm-svn: 132633
This commit is contained in:
Dan Gohman 2011-06-04 07:05:05 +00:00
parent adf80ae9e4
commit baf1afb289
1 changed files with 27 additions and 0 deletions
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27
llvm/test/Transforms/GVN/phi-translate-partial-alias.ll Normal file
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; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64"
; GVN shouldn't PRE the load around the loop backedge because it's
; not actually redundant around the loop backedge, despite appearances
; if phi-translation is ignored.
; CHECK: define void @test0(i8* %begin)
; CHECK: loop:
; CHECK: %l0 = load i8* %phi
; CHECK: call void @bar(i8 %l0)
; CHECK: %l1 = load i8* %phi
define void @test0(i8* %begin) {
entry:
br label %loop
loop:
%phi = phi i8* [ %begin, %entry ], [ %next, %loop ]
%l0 = load i8* %phi
call void @bar(i8 %l0)
%l1 = load i8* %phi
%next = getelementptr inbounds i8* %phi, i8 %l1
br label %loop
}
declare void @bar(i8)