https://bugs.llvm.org/show_bug.cgi?id=36901
Bug ID: 36901
Summary: [DAGCombiner] visitBRCOND() leads to UNREACHABLE:
"Operand not processed?"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 20122
--> https://bugs.llvm.org/attachment.cgi?id=20122&action=edit
reduced testcase
DAG:
t5: i32 = Constant<0>
t6: i32 = Constant<-1>
t7: ch = setgt
t4: i1 = setcc undef:i32, Constant:i32<-8>, setlt:ch
t11: i1 = or t4, Constant:i1<-1>
t10: i1 = setcc undef:i32, Constant:i32<-9>, setlt:ch
t12: i1 = and t11, t10
t0: ch = EntryToken
t13: i1 = xor t11, Constant:i1<-1>
t15: ch = brcond t0, t13, BasicBlock:ch< 0x5373f68>
t17: ch = br t15, BasicBlock:ch< 0x5374428>
visitBRCOND() calls rebuildSetCC() which correctly replaces t13 like:
t15: ch = brcond t0, Constant:i1<0>, BasicBlock:ch< 0x5373f68>
After visit(N) (in combine()) returns, the DAG looks like
t0: ch = EntryToken
t5: i32 = Constant<0>
t6: i32 = Constant<-1>
t7: ch = setgt
t4: i1 = setcc undef:i32, Constant:i32<-8>, setlt:ch
t11: i1 = or t4, Constant:i1<-1>
t10: i1 = setcc undef:i32, Constant:i32<-9>, setlt:ch
t12: i1 = and t11, t10
t15: ch = brcond t0, Constant:i1<0>, BasicBlock:ch< 0x5373f68>
t17: ch = br t15, BasicBlock:ch< 0x5374428>
However, the returned RV looks like
t19: ch = brcond t0, t19, BasicBlock:ch< 0x5373f68>
, which has itself as operand! This is inserted into the DAG...
Runline:
llc -mtriple=s390x-linux-gnu -mcpu=z13 tc_brcond.ll
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