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[LV] Add test cases with multiple exits which require versioning. 

This adds some test coverage for
caafdf07bb, which relaxed an assertion
to only require a unique exit block.
This commit is contained in:
Florian Hahn 2021-01-20 11:43:59 +00:00
parent eff6e75c3f
commit eee2e8813f
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1 changed files with 67 additions and 0 deletions
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67
llvm/test/Transforms/LoopVectorize/multiple-exits-versioning.ll Normal file
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; RUN: opt -loop-vectorize -force-vector-width=2 -S %s | FileCheck %s
; Test cases to make sure LV & loop versioning can handle loops with
; multiple exiting branches.
; Multiple branches exiting the loop to a unique exit block. The loop should
; be vectorized with versioning & noalias metadata should be added.
define void @multiple_exits_unique_exit_block(i32* %A, i32* %B, i64 %N) {
; CHECK-LABEL: @multiple_exits_unique_exit_block
; CHECK: vector.memcheck:
; CHECK-LABEL: vector.body:
; CHECK: %wide.load = load <2 x i32>, <2 x i32>* {{.*}}, align 4, !alias.scope
; CHECK: store <2 x i32> %wide.load, <2 x i32>* {{.*}}, align 4, !alias.scope
; CHECK: br
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%cond.0 = icmp eq i64 %iv, %N
br i1 %cond.0, label %exit, label %for.body
for.body:
%A.gep = getelementptr inbounds i32, i32* %A, i64 %iv
%lv = load i32, i32* %A.gep, align 4
%B.gep = getelementptr inbounds i32, i32* %B, i64 %iv
store i32 %lv, i32* %B.gep, align 4
%iv.next = add nuw i64 %iv, 1
%cond.1 = icmp ult i64 %iv.next, 1000
br i1 %cond.1, label %loop.header, label %exit
exit:
ret void
}
; Multiple branches exiting the loop to different blocks. Currently this is not supported.
define i32 @multiple_exits_multiple_exit_blocks(i32* %A, i32* %B, i64 %N) {
; CHECK-LABEL: @multiple_exits_multiple_exit_blocks
; CHECK-NEXT: entry:
; CHECK: br label %loop.header
; CHECK-NOT: <2 x i32>
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%cond.0 = icmp eq i64 %iv, %N
br i1 %cond.0, label %exit.0, label %for.body
for.body:
%A.gep = getelementptr inbounds i32, i32* %A, i64 %iv
%lv = load i32, i32* %A.gep, align 4
%B.gep = getelementptr inbounds i32, i32* %B, i64 %iv
store i32 %lv, i32* %B.gep, align 4
%iv.next = add nuw i64 %iv, 1
%cond.1 = icmp ult i64 %iv.next, 1000
br i1 %cond.1, label %loop.header, label %exit.1
exit.0:
ret i32 1
exit.1:
ret i32 2
}