http://llvm.org/bugs/show_bug.cgi?id=4965
Summary: Invalid register assignment due to regclass copy
coalesced away
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3502)
--> (http://llvm.org/bugs/attachment.cgi?id=3502)
.ll file
Consider the bytecode attached. Currently it fails due to invalid subreg index
(there is on 32-bit subreg of Q8 reG) despite of explicit copy_to_regclass
node.
It seems the cross-regclass copy is removed during 2addr instruction pass:
%reg1063<def> = INSERT_SUBREG %reg1061, %reg1062, 4
prepend: %reg1063<def> = VMOVQ %reg1061
rewrite to: %reg1063<def> = INSERT_SUBREG %reg1063, %reg1062, 4
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