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[SCEV] Add loop guard tests for ugt/uge predicates (NFC)

This commit is contained in:
Nikita Popov 2021-04-23 22:05:52 +02:00
parent 19b29b1ed1
commit 2f6405ec80
1 changed files with 76 additions and 4 deletions
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80
llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
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@ -531,13 +531,13 @@ define void @crash(i8* %ptr) {
; CHECK-LABEL: 'crash'
; CHECK-NEXT: Classifying expressions for: @crash
; CHECK-NEXT: %text.addr.5 = phi i8* [ %incdec.ptr112, %while.cond111 ], [ null, %while.body ]
; CHECK-NEXT: --> {null,+,-1}<nw><%while.cond111> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %while.cond111: Computable, %while.body: Variant }
; CHECK-NEXT: --> {null,+,-1}<nw><%while.cond111> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %while.cond111: Computable, %while.body: Variant }
; CHECK-NEXT: %incdec.ptr112 = getelementptr inbounds i8, i8* %text.addr.5, i64 -1
; CHECK-NEXT: --> {(-1 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %while.cond111: Computable, %while.body: Variant }
; CHECK-NEXT: --> {(-1 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %while.cond111: Computable, %while.body: Variant }
; CHECK-NEXT: %lastout.2271 = phi i8* [ %incdec.ptr126, %while.body125 ], [ %ptr, %while.end117 ]
; CHECK-NEXT: --> {%ptr,+,1}<nuw><%while.body125> U: full-set S: full-set Exits: {(-2 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> LoopDispositions: { %while.body125: Computable }
; CHECK-NEXT: --> {%ptr,+,1}<nuw><%while.body125> U: full-set S: full-set Exits: {(-2 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> LoopDispositions: { %while.body125: Computable }
; CHECK-NEXT: %incdec.ptr126 = getelementptr inbounds i8, i8* %lastout.2271, i64 1
; CHECK-NEXT: --> {(1 + %ptr)<nuw>,+,1}<nuw><%while.body125> U: [1,0) S: [1,0) Exits: {(-1 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> LoopDispositions: { %while.body125: Computable }
; CHECK-NEXT: --> {(1 + %ptr)<nuw>,+,1}<nuw><%while.body125> U: [1,0) S: [1,0) Exits: {(-1 + null)<nuw><nsw>,+,-1}<nw><%while.cond111> LoopDispositions: { %while.body125: Computable }
; CHECK-NEXT: Determining loop execution counts for: @crash
; CHECK-NEXT: Loop %while.body125: backedge-taken count is {(-2 + (-1 * %ptr) + null),+,-1}<nw><%while.cond111>
; CHECK-NEXT: Loop %while.body125: max backedge-taken count is -2
@ -579,3 +579,75 @@ while.body125:
while.end129: ; preds = %while.body125
ret void
}
define void @test_guard_uge(i32 %blockSize) {
; CHECK-LABEL: 'test_guard_uge'
; CHECK-NEXT: Classifying expressions for: @test_guard_uge
; CHECK-NEXT: %shr = lshr i32 %blockSize, 2
; CHECK-NEXT: --> (%blockSize /u 4) U: [0,1073741824) S: [0,1073741824)
; CHECK-NEXT: %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
; CHECK-NEXT: --> {(%blockSize /u 4),+,-1}<%while.body> U: full-set S: full-set Exits: 1 LoopDispositions: { %while.body: Computable }
; CHECK-NEXT: %dec = add i32 %iv, -1
; CHECK-NEXT: --> {(-1 + (%blockSize /u 4))<nsw>,+,-1}<%while.body> U: full-set S: full-set Exits: 0 LoopDispositions: { %while.body: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test_guard_uge
; CHECK-NEXT: Loop %while.body: backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
; CHECK-NEXT: Loop %while.body: max backedge-taken count is -1
; CHECK-NEXT: Loop %while.body: Predicated backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
; CHECK-NEXT: Predicates:
; CHECK: Loop %while.body: Trip multiple is 1
;
%shr = lshr i32 %blockSize, 2
%guard = icmp ult i32 %blockSize, 4
br i1 %guard, label %while.end, label %while.body.preheader
while.body.preheader:
br label %while.body
while.body:
%iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
%dec = add i32 %iv, -1
%cmp.not = icmp eq i32 %dec, 0
br i1 %cmp.not, label %while.end.loopexit, label %while.body
while.end.loopexit:
br label %while.end
while.end:
ret void
}
define void @test_guard_ugt(i32 %blockSize) {
; CHECK-LABEL: 'test_guard_ugt'
; CHECK-NEXT: Classifying expressions for: @test_guard_ugt
; CHECK-NEXT: %shr = lshr i32 %blockSize, 2
; CHECK-NEXT: --> (%blockSize /u 4) U: [0,1073741824) S: [0,1073741824)
; CHECK-NEXT: %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
; CHECK-NEXT: --> {(%blockSize /u 4),+,-1}<%while.body> U: full-set S: full-set Exits: 1 LoopDispositions: { %while.body: Computable }
; CHECK-NEXT: %dec = add i32 %iv, -1
; CHECK-NEXT: --> {(-1 + (%blockSize /u 4))<nsw>,+,-1}<%while.body> U: full-set S: full-set Exits: 0 LoopDispositions: { %while.body: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test_guard_ugt
; CHECK-NEXT: Loop %while.body: backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
; CHECK-NEXT: Loop %while.body: max backedge-taken count is -1
; CHECK-NEXT: Loop %while.body: Predicated backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
; CHECK-NEXT: Predicates:
; CHECK: Loop %while.body: Trip multiple is 1
;
%shr = lshr i32 %blockSize, 2
%guard = icmp ule i32 %blockSize, 3
br i1 %guard, label %while.end, label %while.body.preheader
while.body.preheader:
br label %while.body
while.body:
%iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
%dec = add i32 %iv, -1
%cmp.not = icmp eq i32 %dec, 0
br i1 %cmp.not, label %while.end.loopexit, label %while.body
while.end.loopexit:
br label %while.end
while.end:
ret void
}