2009-09-09 01:54:48 +02:00
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; RUN: llc < %s -march=x86 | not grep IMPLICIT_DEF
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Fixes a nasty dag combiner bug that causes a bunch of tests to fail at -O0.
It's not safe to use the two value CombineTo variant to combine away a dead load.
e.g.
v1, chain2 = load chain1, loc
v2, chain3 = load chain2, loc
v3 = add v2, c
Now we replace use of v1 with undef, use of chain2 with chain1.
ReplaceAllUsesWith() will iterate through uses of the first load and update operands:
v1, chain2 = load chain1, loc
v2, chain3 = load chain1, loc
v3 = add v2, c
Now the second load is the same as the first load, SelectionDAG cse will ensure
the use of second load is replaced with the first load.
v1, chain2 = load chain1, loc
v3 = add v1, c
Then v1 is replaced with undef and bad things happen.
llvm-svn: 46099
2008-01-17 00:11:54 +01:00
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%struct.node_t = type { double*, %struct.node_t*, %struct.node_t**, double**, double*, i32, i32 }
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define void @localize_local_bb19_bb(%struct.node_t** %cur_node) {
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newFuncRoot:
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%tmp1 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp2 = getelementptr %struct.node_t* %tmp1, i32 0, i32 4 ; <double**> [#uses=1]
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%tmp3 = load double** %tmp2, align 4 ; <double*> [#uses=1]
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%tmp4 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp5 = getelementptr %struct.node_t* %tmp4, i32 0, i32 4 ; <double**> [#uses=1]
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store double* %tmp3, double** %tmp5, align 4
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%tmp6 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp7 = getelementptr %struct.node_t* %tmp6, i32 0, i32 3 ; <double***> [#uses=1]
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%tmp8 = load double*** %tmp7, align 4 ; <double**> [#uses=1]
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%tmp9 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp10 = getelementptr %struct.node_t* %tmp9, i32 0, i32 3 ; <double***> [#uses=1]
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store double** %tmp8, double*** %tmp10, align 4
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%tmp11 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp12 = getelementptr %struct.node_t* %tmp11, i32 0, i32 0 ; <double**> [#uses=1]
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%tmp13 = load double** %tmp12, align 4 ; <double*> [#uses=1]
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%tmp14 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp15 = getelementptr %struct.node_t* %tmp14, i32 0, i32 0 ; <double**> [#uses=1]
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store double* %tmp13, double** %tmp15, align 4
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%tmp16 = load %struct.node_t** %cur_node, align 4 ; <%struct.node_t*> [#uses=1]
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%tmp17 = getelementptr %struct.node_t* %tmp16, i32 0, i32 1 ; <%struct.node_t**> [#uses=1]
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%tmp18 = load %struct.node_t** %tmp17, align 4 ; <%struct.node_t*> [#uses=1]
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store %struct.node_t* %tmp18, %struct.node_t** %cur_node, align 4
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ret void
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}
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