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Remove dead SD nodes after the combining pass. Fixes PR12201.

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llvm-svn: 154786
This commit is contained in:
Hal Finkel 2012-04-16 03:33:22 +00:00
parent fc5ab5d388
commit 457fbe481c
2 changed files with 47 additions and 0 deletions
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1
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1080,6 +1080,7 @@ void DAGCombiner::Run(CombineLevel AtLevel) {
// If the root changed (e.g. it was a dead load, update the root). // If the root changed (e.g. it was a dead load, update the root).
DAG.setRoot(Dummy.getValue()); DAG.setRoot(Dummy.getValue());
DAG.RemoveDeadNodes();
} }
SDValue DAGCombiner::visit(SDNode *N) { SDValue DAGCombiner::visit(SDNode *N) {

46
test/CodeGen/PowerPC/ppc-vaarg-agg.ll Normal file
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@ -0,0 +1,46 @@
target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32"
target triple = "powerpc-montavista-linux-gnuspe"
; RUN: llc < %s -march=ppc32 | FileCheck %s
%struct.__va_list_tag.0.9.18.23.32.41.48.55.62.67.72.77.82.87.90.93.96.101.105 = type { i8, i8, i16, i8*, i8* }
define fastcc void @test1(%struct.__va_list_tag.0.9.18.23.32.41.48.55.62.67.72.77.82.87.90.93.96.101.105* %args) {
entry:
br i1 undef, label %repeat, label %maxlen_reached
repeat: ; preds = %entry
switch i32 undef, label %sw.bb323 [
i32 77, label %sw.bb72
i32 111, label %sw.bb309
i32 80, label %sw.bb313
i32 117, label %sw.bb326
i32 88, label %sw.bb321
]
sw.bb72: ; preds = %repeat
unreachable
sw.bb309: ; preds = %repeat
unreachable
sw.bb313: ; preds = %repeat
unreachable
sw.bb321: ; preds = %repeat
unreachable
sw.bb323: ; preds = %repeat
%0 = va_arg %struct.__va_list_tag.0.9.18.23.32.41.48.55.62.67.72.77.82.87.90.93.96.101.105* %args, i32
unreachable
sw.bb326: ; preds = %repeat
unreachable
maxlen_reached: ; preds = %entry
ret void
}
; If the SD nodes are not cleaup up correctly, then this can fail to compile
; with an error like: Cannot select: ch = setlt [ID=6]
; CHECK: @test1