https://llvm.org/bugs/show_bug.cgi?id=23778
Bug ID: 23778
Summary: Llc crashes if CodeGen/PowerPC/crbit-asm.ll test is
compiled with -O1 or -O0
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The test relies on availability of the CR bits feature and the
PPC::CRBITRCRegClass register class. CRBITRCRegClass is added when the CR bits
feature is on (see PPCTargetLowering constructor), while the CR bits feature
itself is available for -O2 or greater only (see function computeFSAdditions in
lib/Target/PowerPC/PPCTargetMachine.cpp).
Compiling the CodeGen/PowerPC/crbit-asm.ll test with -O0 or -O1 crashes llc.
Llc tries to copy to a register of type i1, which is illegal if CR bits is off.
This signals the assertion "Copying to an illegal type!" in the getCopyToParts
function (lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp).
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