https://llvm.org/bugs/show_bug.cgi?id=27850
Bug ID: 27850
Summary: Assertion failed: (AlreadyScheduled.insert(&GV).second
&& "Should not reschedule")
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: mehdi.am...@apple.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Linking the following module into an empty module (llvm-link empty.ll bug.ll)
leads to an assertion:
Assertion failed: (AlreadyScheduled.insert(&GV).second && "Should not
reschedule"), function scheduleMapGlobalInitializer, file
lib/Transforms/Utils/ValueMapper.cpp, line 1009.
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9"
@A = internal constant i8 1
@B = alias i8, i8* @A
@C = global [2 x i8*] [i8* @A, i8* @B]
It seems that the two maps (ValueMap and AliasValueMap) are not playing well
with each other. We first visit @C, then materialize its initializer, which
lead us to @A, which we schedule to be materialized later, and then move to B
which also scheduled.
At this point we moved with the worklist and process B first. Since it is an
alias it will be materialized using the AliasValueMap, and we pull the aliasee
@A and schedules it: this is where we hit the assertions because A was already
scheduled.
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