https://llvm.org/bugs/show_bug.cgi?id=31251
Bug ID: 31251
Summary: AVX512 Loop Vectorizer introduces non-dominating
instruction
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: kfisc...@college.harvard.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Bugpoint reduced test case:
```
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "bugpoint-output-1d9ce6e.bc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%Dual.212 = type { %Dual.213, %Partials.215 }
%Dual.213 = type { double, %Partials.214 }
%Partials.214 = type { [2 x double] }
%Partials.215 = type { [2 x %Dual.213] }
; Function Attrs: sspreq
define void @"julia_axpy!_65480"(%Dual.212*) #0 {
top:
br label %if24
if24: ; preds = %if24, %top
%"#temp#1.sroa.3.02" = phi i64 [ undef, %top ], [ %2, %if24 ]
%"#temp#1.sroa.0.01" = phi i64 [ undef, %top ], [ %1, %if24 ]
%1 = add i64 %"#temp#1.sroa.0.01", 1
%2 = add i64 %"#temp#1.sroa.3.02", 1
%v2.sroa.0.0..sroa_cast = bitcast %Dual.212* %0 to i64*
%v2.sroa.0.0.copyload = load i64, i64* %v2.sroa.0.0..sroa_cast, align 1
%3 = add i64 %"#temp#1.sroa.0.01", -1
%4 = getelementptr inbounds %Dual.212, %Dual.212* undef, i64 %3, i32 1, i32
0, i64 0, i32 1, i32 0, i64 0
%5 = bitcast double* %4 to i64*
store i64 undef, i64* %5, align 8
%notlhs27 = icmp eq i64 %2, undef
%notrhs28 = icmp eq i64 %1, undef
%6 = or i1 %notrhs28, %notlhs27
br i1 %6, label %L41.L335_crit_edge, label %if24
L41.L335_crit_edge: ; preds = %if24
ret void
}
attributes #0 = { sspreq "no-frame-pointer-elim"="true" "target-cpu"="knl" }
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"Debug Info Version", i32 3}
```
```
$ opt -loop-vectorize bug.ll
Instruction does not dominate all uses!
%v2.sroa.0.0..sroa_cast = bitcast %Dual.212* %0 to i64*
%bc = bitcast i64* %v2.sroa.0.0..sroa_cast to i8*
Instruction does not dominate all uses!
%v2.sroa.0.0..sroa_cast = bitcast %Dual.212* %0 to i64*
%bc1 = bitcast i64* %v2.sroa.0.0..sroa_cast to i8*
```
Working on a patch.
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