forked from OSchip/llvm-project
62 lines
1.2 KiB
LLVM
62 lines
1.2 KiB
LLVM
; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
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; One side exit dominating the latch, exact backedge taken count is known.
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define void @test_01() {
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; CHECK-LABEL: Determining loop execution counts for: @test_01
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; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
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%side.cond = icmp slt i32 %iv, 50
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br i1 %side.cond, label %backedge, label %side.exit
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backedge:
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%iv.next = add i32 %iv, 1
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%loop.cond = icmp slt i32 %iv, 100
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br i1 %loop.cond, label %loop, label %exit
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exit:
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ret void
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side.exit:
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ret void
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}
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define void @test_02(i1 %c) {
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; CHECK-LABEL: Determining loop execution counts for: @test_02
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; CHECK-NEXT: Loop %loop: <multiple exits> backedge-taken count is 50
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
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br i1 %c, label %if.true, label %if.false
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if.true:
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br label %merge
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if.false:
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br label %merge
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merge:
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%side.cond = icmp slt i32 %iv, 50
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br i1 %side.cond, label %backedge, label %side.exit
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backedge:
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%iv.next = add i32 %iv, 1
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%loop.cond = icmp slt i32 %iv, 100
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br i1 %loop.cond, label %loop, label %exit
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exit:
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ret void
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side.exit:
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ret void
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}
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