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Print <def,read-undef> to avoid confusion.

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The <undef> flag on a def operand only applies to partial register
redefinitions. Only print the flag when relevant, and print it as
<def,read-undef> to make it clearer what it means.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155239 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-04-20 21:45:33 +00:00
parent d06c2decc2
commit 3429c7571e
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/MachineInstr.cpp
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@ -255,6 +255,10 @@ void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
OS << "imp-";
OS << "def";
NeedComma = true;
// <def,read-undef> only makes sense when getSubReg() is set.
// Don't clutter the output otherwise.
if (isUndef() && getSubReg())
OS << ",read-undef";
} else if (isImplicit()) {
OS << "imp-use";
NeedComma = true;
@ -271,7 +275,7 @@ void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
OS << "dead";
NeedComma = true;
}
if (isUndef()) {
if (isUndef() && isUse()) {
if (NeedComma) OS << ',';
OS << "undef";
NeedComma = true;