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; RUN: opt -passes=loop-distribute -enable-loop-distribute -verify-loop-info -verify-dom-info -S \
; RUN: < %s | FileCheck %s
; NOTE: The tests below use infinite loops to force unknown backedge-taken counts.
; Making the exit condition depend on a load would break current loop-distribute,
; because it requires all accesses to end up in either of the loops, but not both.
; TODO
; Can distribute with unknown backedge-taken count, because no runtime checks are
; required.
define void @unknown_btc_distribute_no_checks_needed(ptr noalias %a, ptr noalias %c, ptr noalias %d) {
; CHECK-LABEL: @unknown_btc_distribute_no_checks_needed(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %for.body
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%ind = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidxA = getelementptr inbounds i32, ptr %a, i32 %ind
%loadA = load i32, ptr %arrayidxA, align 4
%mulA = mul i32 %loadA, 10
%add = add nuw nsw i32 %ind, 1
%arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i32 %add
store i32 %mulA, ptr %arrayidxA_plus_4, align 4
%arrayidxD = getelementptr inbounds i32, ptr %d, i32 %ind
%loadD = load i32, ptr %arrayidxD, align 4
%mulC = mul i32 %loadD, 20
%arrayidxC = getelementptr inbounds i32, ptr %c, i32 %ind
store i32 %mulC, ptr %arrayidxC, align 4
br i1 false, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; Cannot distribute with unknown backedge-taken count, because runtime checks for
; induction wrapping are required.
define void @unknown_btc_do_not_distribute_wrapping_checks(ptr noalias %a, ptr noalias %c, ptr noalias %d) {
; CHECK-LABEL: @unknown_btc_do_not_distribute_wrapping_checks(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %for.body
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%ind = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidxA = getelementptr inbounds i32, ptr %a, i32 %ind
%loadA = load i32, ptr %arrayidxA, align 4
%mulA = mul i32 %loadA, 10
%add = add i32 %ind, 1
%arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i32 %add
store i32 %mulA, ptr %arrayidxA_plus_4, align 4
%arrayidxD = getelementptr inbounds i32, ptr %d, i32 %ind
%loadD = load i32, ptr %arrayidxD, align 4
%mulC = mul i32 %loadD, 20
%arrayidxC = getelementptr inbounds i32, ptr %c, i32 %ind
store i32 %mulC, ptr %arrayidxC, align 4
br i1 false, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
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