https://bugs.llvm.org/show_bug.cgi?id=39542
Bug ID: 39542
Summary: Could not join subrange in testcase with no meaningful
values
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Register Allocator
Assignee: unassignedb...@nondot.org
Reporter: matthew.arsena...@amd.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21074
--> https://bugs.llvm.org/attachment.cgi?id=21074&action=edit
Reduced testcase
The failing case concludes CR_Impossible because of this:
// We need to verify that no instructions are reading the clobbered lanes. To
// save compile time, we'll only check that locally. Don't allow the tainted
// value to escape the basic block.
MachineBasicBlock *MBB = Indexes->getMBBFromIndex(VNI->def);
if (OtherLRQ.endPoint() >= Indexes->getMBBEndIdx(MBB))
return CR_Impossible;
Not sure why it passed the first mapValues
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