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[RDF] Ignore undef use operands 

llvm-svn: 280717
This commit is contained in:
Krzysztof Parzyszek 2016-09-06 17:03:13 +00:00
parent 40c6235b79
commit 7c9b012629
2 changed files with 56 additions and 1 deletions
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2
llvm/lib/Target/Hexagon/RDFGraph.cpp
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@ -1252,7 +1252,7 @@ void DataFlowGraph::buildStmt(NodeAddr<BlockNode*> BA, MachineInstr &In) {
for (unsigned OpN = 0; OpN < NumOps; ++OpN) {
MachineOperand &Op = In.getOperand(OpN);
if (!Op.isReg() || !Op.isUse())
if (!Op.isReg() || !Op.isUse() || Op.isUndef())
continue;
RegisterRef RR = { Op.getReg(), Op.getSubReg() };
// Add implicit uses on return and call instructions, and on predicated

55
llvm/test/CodeGen/Hexagon/rdf-ignore-undef.ll Normal file
View File

@ -0,0 +1,55 @@
; RUN: llc -march=hexagon -verify-machineinstrs < %s | FileCheck %s
; Check that we don't crash.
; CHECK: call foo
target triple = "hexagon"
%struct.1 = type { i16, i8, i32, i8*, i8*, i8*, i8*, i8*, i8*, i32* }
%struct.0 = type { i32, i32, i32, i32, i32, i32, i32, i32, i32 }
declare void @foo(i8*, %struct.0*) local_unnamed_addr #0
declare void @bar(%struct.1*, %struct.0* readonly) local_unnamed_addr #0
define i32 @fred(i32 %argc, i8** nocapture readonly %argv) local_unnamed_addr #0 {
entry:
br label %do.body
do.body: ; preds = %if.end88.do.body_crit_edge, %entry
%cond = icmp eq i32 undef, 0
br i1 %cond, label %if.end49, label %if.then124
if.end49: ; preds = %do.body
call void @foo(i8* nonnull undef, %struct.0* nonnull undef) #0
br i1 undef, label %if.end55, label %if.then53
if.then53: ; preds = %if.end49
call void @bar(%struct.1* null, %struct.0* nonnull undef)
br label %if.end55
if.end55: ; preds = %if.then53, %if.end49
switch i8 undef, label %sw.epilog79 [
i8 0, label %sw.bb77
i8 3, label %sw.bb77
]
sw.bb77: ; preds = %if.end55, %if.end55
br label %sw.epilog79
sw.epilog79: ; preds = %sw.bb77, %if.end55
br i1 undef, label %if.end88, label %if.then81
if.then81: ; preds = %sw.epilog79
br label %if.end88
if.end88: ; preds = %if.then81, %sw.epilog79
store float 0.000000e+00, float* undef, align 4
br i1 undef, label %if.end88.do.body_crit_edge, label %if.then124
if.end88.do.body_crit_edge: ; preds = %if.end88
br label %do.body
if.then124: ; preds = %if.end88, %do.body
unreachable
}
attributes #0 = { nounwind }