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[tests] Add a couple of tests for zero stride trip counts w/loop varying exit values

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This commit is contained in:
Philip Reames 2021-07-19 16:33:01 -07:00
parent 18c83b5d27
commit be7020e420
1 changed files with 49 additions and 1 deletions
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50
test/Analysis/ScalarEvolution/trip-count-unknown-stride.ll
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@ -163,7 +163,7 @@ for.end: ; preds = %for.body, %entry
; CHECK: Loop %for.body: Unpredictable predicated backedge-taken count.
; Note that this function will always execute undefined behavior and thus
; any value is valid for a backedge taken count.
define void @zero_stride_ub(i32* nocapture %A, i32 %n, i32 %s) {
define void @zero_stride_ub(i32* nocapture %A) {
entry:
br label %for.body
@ -181,6 +181,54 @@ for.end: ; preds = %for.body, %entry
ret void
}
; When %zero = 0, this loop is only well defined if %n < 0 and thus BTC = 0.
; CHECK-LABEL: Determining loop execution counts for: @zero_stride_symbolic
; CHECK: Loop %for.body: backedge-taken count is ((((-1 * (1 umin ((-1 * %zero) + (%n smax %zero))))<nuw><nsw> + (-1 * %zero) + (%n smax %zero)) /u (1 umax %zero)) + (1 umin ((-1 * %zero) + (%n smax %zero))))
; CHECK: Loop %for.body: max backedge-taken count is -1
define void @zero_stride_symbolic(i32* nocapture %A, i32 %n, i32 %zero) {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %i.05
%0 = load i32, i32* %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, i32* %arrayidx, align 4
%add = add nsw i32 %i.05, %zero
%cmp = icmp slt i32 %add, %n
br i1 %cmp, label %for.body, label %for.end, !llvm.loop !8
for.end: ; preds = %for.body, %entry
ret void
}
; CHECK-LABEL: Determining loop execution counts for: @zero_stride_varying_rhs
; CHECK: Loop %for.body: Unpredictable backedge-taken count.
; CHECK: Loop %for.body: max backedge-taken count is -1
define void @zero_stride_varying_rhs(i32* nocapture %A, i32* %n_p, i32 %zero) {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %i.05
%0 = load i32, i32* %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, i32* %arrayidx, align 4
%add = add nsw i32 %i.05, %zero
%n = load i32, i32* %n_p
%cmp = icmp slt i32 %add, %n
br i1 %cmp, label %for.body, label %for.end, !llvm.loop !8
for.end: ; preds = %for.body, %entry
ret void
}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}