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[Test] Add loop deletion test with switch

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This commit is contained in:
Max Kazantsev 2021-06-11 17:42:33 +07:00
parent 942f6eb554
commit 3bc0d7e3d3
1 changed files with 43 additions and 0 deletions
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43
test/Transforms/LoopDeletion/eval_first_iteration.ll
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@ -723,3 +723,46 @@ done: ; preds = %backedge
failure:
unreachable
}
; TODO: We can break the backedge here.
define i32 @test_switch(i32 %limit) {
; CHECK-LABEL: @test_switch(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LOOP_GUARD:%.*]] = icmp sgt i32 [[LIMIT:%.*]], 0
; CHECK-NEXT: br i1 [[LOOP_GUARD]], label [[LOOP_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ [[SUM_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[LIMIT]], [[SUM]]
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[IS_POSITIVE]], i32 [[SUB]], i32 0
; CHECK-NEXT: [[SUM_NEXT]] = add i32 [[SUM]], [[SEL]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], [[LIMIT]]
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK: done:
; CHECK-NEXT: [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[LOOP]] ]
; CHECK-NEXT: ret i32 [[SUM_NEXT_LCSSA]]
; CHECK: failure:
; CHECK-NEXT: unreachable
;
entry:
%loop_guard = icmp sgt i32 %limit, 0
br i1 %loop_guard, label %loop, label %failure
loop: ; preds = %backedge, %entry
%sum = phi i32 [ 0, %entry ], [ %sum.next, %loop ]
%sub = sub i32 %limit, %sum
%is.positive = icmp sgt i32 %sub, 0
%sel = select i1 %is.positive, i32 %sub, i32 0
%sum.next = add i32 %sum, %sel
%loop.cond = icmp ne i32 %sum.next, %limit
br i1 %loop.cond, label %loop, label %done
done: ; preds = %backedge
%sum.next.lcssa = phi i32 [ %sum.next, %loop ]
ret i32 %sum.next.lcssa
failure:
unreachable
}