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We should remove the live range from the destination register only if *all* defs

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are dead, not just the def of this register. I.e., a register could be dead, but
it's subreg isn't.

Testcase to follow with a subsequent patch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106878 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-06-25 20:42:55 +00:00
parent 39afa908de
commit 39d258aa49
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1892,8 +1892,8 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
if (li_->hasInterval(SrcReg)) {
LiveInterval &RegInt = li_->getInterval(SrcReg);
// If def of this move instruction is dead, remove its live range
// from the dstination register's live interval.
if (MI->registerDefIsDead(DstReg)) {
// from the destination register's live interval.
if (MI->allDefsAreDead()) {
if (!ShortenDeadCopySrcLiveRange(RegInt, MI))
ShortenDeadCopyLiveRange(RegInt, MI);
} else {