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If the type legalizer actually legalized anything

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(this doesn't happen that often, since most code
does not use illegal types) then follow it by a
DAG combiner run that is allowed to generate
illegal operations but not illegal types.  I didn't
modify the target combiner code to distinguish like
this between illegal operations and illegal types,
so it will not produce illegal operations as well
as not producing illegal types.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2008-11-24 14:53:14 +00:00
parent 19ea77f09d
commit 25cf2275ff
7 changed files with 253 additions and 209 deletions
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6
include/llvm/Target/TargetLowering.h
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@@ -701,12 +701,10 @@ public:
/// that want to combine
struct TargetLoweringOpt {
SelectionDAG &DAG;
bool AfterLegalize;
SDValue Old;
SDValue New;
explicit TargetLoweringOpt(SelectionDAG &InDAG, bool afterLegalize)
: DAG(InDAG), AfterLegalize(afterLegalize) {}
explicit TargetLoweringOpt(SelectionDAG &InDAG) : DAG(InDAG) {}
bool CombineTo(SDValue O, SDValue N) {
Old = O;
@@ -793,7 +791,7 @@ public:
/// Return Value:
/// SDValue.Val == 0 - No change was made
/// SDValue.Val == N - N was replaced, is dead, and is already handled.
/// otherwise - N should be replaced by the returned Operand.
/// otherwise - N should be replaced by the returned Operand.
///
/// In addition, methods provided by DAGCombinerInfo may be used to perform
/// more complex transformations.