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6ce2471806
If it's negative, the loop is already proven to be infinite. Fixes PR13489! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161107 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
2.8 KiB
LLVM
104 lines
2.8 KiB
LLVM
; RUN: opt < %s -analyze -scalar-evolution \
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; RUN: -scalar-evolution-max-iterations=0 | FileCheck %s
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; PR1101
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@A = weak global [1000 x i32] zeroinitializer, align 32
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define void @test1(i32 %N) {
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entry:
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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br label %bb3
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bb: ; preds = %bb3
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%tmp = getelementptr [1000 x i32]* @A, i32 0, i32 %i.0 ; <i32*> [#uses=1]
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store i32 123, i32* %tmp
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%tmp2 = add i32 %i.0, 1 ; <i32> [#uses=1]
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br label %bb3
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bb3: ; preds = %bb, %entry
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%i.0 = phi i32 [ 2, %entry ], [ %tmp2, %bb ] ; <i32> [#uses=3]
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%SQ = mul i32 %i.0, %i.0
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%tmp4 = mul i32 %i.0, 2
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%tmp5 = sub i32 %SQ, %tmp4
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%tmp3 = icmp sle i32 %tmp5, 9999 ; <i1> [#uses=1]
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br i1 %tmp3, label %bb, label %bb5
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bb5: ; preds = %bb3
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br label %return
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return: ; preds = %bb5
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ret void
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}
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; CHECK: Determining loop execution counts for: @test1
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; CHECK-NEXT: backedge-taken count is 100
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; PR10383
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; These next two used to crash.
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define void @test2(i1 %cmp, i64 %n) {
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entry:
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br label %for.body1
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for.body1:
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%a0.08 = phi i64 [ 0, %entry ], [ %inc512, %for.body1 ]
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%inc512 = add i64 %a0.08, 1
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br i1 %cmp, label %preheader, label %for.body1
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preheader:
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br label %for.body2
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for.body2:
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%indvar = phi i64 [ 0, %preheader ], [ %indvar.next, %for.body2 ]
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%tmp111 = add i64 %n, %indvar
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%tmp114 = mul i64 %a0.08, %indvar
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%mul542 = mul i64 %tmp114, %tmp111
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%indvar.next = add i64 %indvar, 1
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br i1 undef, label %end, label %for.body2
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end:
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ret void
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}
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; CHECK: Determining loop execution counts for: @test2
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define i32 @test3() {
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if.then466:
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br i1 undef, label %for.cond539.preheader, label %for.inc479
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for.inc479:
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%a2.07 = phi i32 [ %add495, %for.inc479 ], [ 0, %if.then466 ]
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%j.36 = phi i32 [ %inc497, %for.inc479 ], [ undef, %if.then466 ]
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%mul484 = mul nsw i32 %j.36, %j.36
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%mul491 = mul i32 %j.36, %j.36
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%mul493 = mul i32 %mul491, %mul484
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%add495 = add nsw i32 %mul493, %a2.07
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%inc497 = add nsw i32 %j.36, 1
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br i1 undef, label %for.cond539.preheader, label %for.inc479
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for.cond539.preheader:
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unreachable
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}
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; CHECK: Determining loop execution counts for: @test3
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; PR13489
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; We used to crash on this too.
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define void @test4() {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%v2.02 = phi i64 [ 2, %entry ], [ %phitmp, %for.body ]
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%v1.01 = phi i64 [ -2, %entry ], [ %sub1, %for.body ]
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%sub1 = sub i64 %v1.01, %v2.02
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%phitmp = add i64 %v2.02, 2
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%tobool = icmp eq i64 %sub1, %phitmp
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br i1 %tobool, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; CHECK: Determining loop execution counts for: @test4
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