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LiveInterval: Document and enforce rules about empty subranges.

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Empty subranges are not allowed in a LiveInterval and must be removed
instead: Check this in the verifiers, put a reminder for this in the
comment of the shrinkToUses variant for a single lane and make it
automatic for the shrinkToUses variant for a LiveInterval.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242431 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-16 18:55:35 +00:00
parent ac40c926aa
commit 0219a272ec
4 changed files with 11 additions and 0 deletions
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2
lib/CodeGen/MachineVerifier.cpp
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@ -1671,6 +1671,8 @@ void MachineVerifier::verifyLiveInterval(const LiveInterval &LI) {
report("Lane masks of sub ranges overlap in live interval", MF, LI);
if ((SR.LaneMask & ~MaxMask) != 0)
report("Subrange lanemask is invalid", MF, LI);
if (SR.empty())
report("Subrange must not be empty", MF, SR, LI.reg, SR.LaneMask);
Mask |= SR.LaneMask;
verifyLiveRange(SR, LI.reg, SR.LaneMask);
if (!LI.covers(SR))