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[SCEV] Add additional tests where the max BTC is limited by wrapping.

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This commit is contained in:
Florian Hahn 2020-10-16 20:16:32 +01:00
parent 73f501c86d
commit 5407cf6224
1 changed files with 49 additions and 8 deletions
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57
test/Analysis/ScalarEvolution/max-backedge-taken-count-limit-by-wrapping.ll
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@ -4,8 +4,8 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @max_backedge_taken_count_by_wrapping1(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping1
define void @max_backedge_taken_count_by_wrapping1_nsw_nuw(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping1_nsw_nuw
; CHECK-NEXT: Loop %loop: backedge-taken count is (%N /u 4)
; CHECK-NEXT: Loop %loop: max backedge-taken count is 63
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (%N /u 4)
@ -25,18 +25,38 @@ exit:
ret void
}
; TODO: Max backedge taken count could be improved.
define void @max_backedge_taken_count_by_wrapping2(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping2
; CHECK-NEXT: Loop %loop: backedge-taken count is ((-128 + %N) /u 4)
define void @max_backedge_taken_count_by_wrapping1_nuw(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping1_nuw
; CHECK-NEXT: Loop %loop: backedge-taken count is (%N /u 4)
; CHECK-NEXT: Loop %loop: max backedge-taken count is 63
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is ((-128 + %N) /u 4)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (%N /u 4)
;
entry:
br label %loop
loop:
%iv = phi i8 [ 128, %entry ], [ %iv.next, %loop ]
%iv = phi i8 [ 0, %entry ], [ %iv.next, %loop ]
%gep = getelementptr i8, i8* %ptr, i8 %iv
store i8 %iv, i8* %gep
%iv.next = add nuw i8 %iv, 4
%ec = icmp ne i8 %iv, %N
br i1 %ec, label %loop, label %exit
exit:
ret void
}
define void @max_backedge_taken_count_by_wrapping2_nsw_nuw(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping2
; CHECK-NEXT: Loop %loop: backedge-taken count is ((-64 + %N) /u 4)
; CHECK-NEXT: Loop %loop: max backedge-taken count is 63
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is ((-64 + %N) /u 4)
;
entry:
br label %loop
loop:
%iv = phi i8 [ 64, %entry ], [ %iv.next, %loop ]
%gep = getelementptr i8, i8* %ptr, i8 %iv
store i8 %iv, i8* %gep
%iv.next = add nuw nsw i8 %iv, 4
@ -46,3 +66,24 @@ loop:
exit:
ret void
}
define void @max_backedge_taken_count_by_wrapping2_nuw(i8 %N, i8* %ptr) {
; CHECK-LABEL: Determining loop execution counts for: @max_backedge_taken_count_by_wrapping2
; CHECK-NEXT: Loop %loop: backedge-taken count is ((-64 + %N) /u 4)
; CHECK-NEXT: Loop %loop: max backedge-taken count is 63
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is ((-64 + %N) /u 4)
;
entry:
br label %loop
loop:
%iv = phi i8 [ 64, %entry ], [ %iv.next, %loop ]
%gep = getelementptr i8, i8* %ptr, i8 %iv
store i8 %iv, i8* %gep
%iv.next = add nuw i8 %iv, 4
%ec = icmp ne i8 %iv, %N
br i1 %ec, label %loop, label %exit
exit:
ret void
}