https://bugs.llvm.org/show_bug.cgi?id=44020
Bug ID: 44020
Summary: [LoopVectorizer] bad vectorized loop: "Instruction
does not dominate all uses!"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org, llvm-...@redking.me.uk
CC: llvm-...@redking.me.uk
clang -cc1 -triple s390x-ibm-linux -S -target-cpu z13 -O3 -w -vectorize-loops
-mllvm -force-target-instruction-cost=1 -mllvm -unroll-full-max-count=1
-faddrsig -x ir tc_insdoesnotdom.ll
Instruction does not dominate all uses!
%27 = phi <4 x i32> [ %21, %pred.load.continue10 ], [ %26, %pred.load.if11 ]
%0 = shufflevector <4 x i32> %vector.recur, <4 x i32> %27, <4 x i32> <i32 3,
i32 4, i32 5, i32 6>
in function func_21
fatal error: error in backend: Broken function found, compilation aborted!
Loop vectorizer seems to build a loop where the use comes before the definition
(%29):
vector.body:
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %pred.store.continue18 ]
%vector.recur = phi <4 x i32> [ %vector.recur.init, %vector.ph ], [ %29,
%pred.store.continue18 ]
%0 = shufflevector <4 x i32> %vector.recur, <4 x i32> %29, <4 x i32> <i32 3,
i32 4, i32 5, i32 6>
...
pred.load.continue12:
%29 = phi <4 x i32> [ %23, %pred.load.continue10 ], [ %28, %pred.load.if11 ]
...
pred.store.continue18:
%index.next = add i64 %index, 4
%43 = icmp eq i64 %index.next, 8
br i1 %43, label %middle.block, label %vector.body, !llvm.loop !0
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