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https://github.com/c64scene-ar/llvm-6502.git
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00cb5b7245
true or false as its exit condition. These are usually eliminated by SimplifyCFG, but the may be left around during a pass which wishes to preserve the CFG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96683 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
1.9 KiB
LLVM
77 lines
1.9 KiB
LLVM
; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
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; Trip counts with trivial exit conditions.
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; CHECK: Determining loop execution counts for: @a
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; CHECK: Loop %loop: Unpredictable backedge-taken count.
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; CHECK: Loop %loop: Unpredictable max backedge-taken count.
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; CHECK: Determining loop execution counts for: @b
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; CHECK: Loop %loop: backedge-taken count is false
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; CHECK: Loop %loop: max backedge-taken count is false
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; CHECK: Determining loop execution counts for: @c
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; CHECK: Loop %loop: backedge-taken count is false
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; CHECK: Loop %loop: max backedge-taken count is false
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; CHECK: Determining loop execution counts for: @d
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; CHECK: Loop %loop: Unpredictable backedge-taken count.
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; CHECK: Loop %loop: Unpredictable max backedge-taken count.
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define void @a(i64 %n) nounwind {
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entry:
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%t0 = icmp sgt i64 %n, 0
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br i1 %t0, label %loop, label %return
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loop:
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%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
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%i.next = add nsw i64 %i, 1
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%exitcond = icmp eq i64 %i.next, %n
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br i1 false, label %return, label %loop
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return:
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ret void
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}
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define void @b(i64 %n) nounwind {
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entry:
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%t0 = icmp sgt i64 %n, 0
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br i1 %t0, label %loop, label %return
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loop:
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%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
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%i.next = add nsw i64 %i, 1
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%exitcond = icmp eq i64 %i.next, %n
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br i1 true, label %return, label %loop
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return:
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ret void
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}
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define void @c(i64 %n) nounwind {
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entry:
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%t0 = icmp sgt i64 %n, 0
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br i1 %t0, label %loop, label %return
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loop:
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%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
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%i.next = add nsw i64 %i, 1
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%exitcond = icmp eq i64 %i.next, %n
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br i1 false, label %loop, label %return
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return:
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ret void
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}
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define void @d(i64 %n) nounwind {
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entry:
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%t0 = icmp sgt i64 %n, 0
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br i1 %t0, label %loop, label %return
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loop:
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%i = phi i64 [ %i.next, %loop ], [ 0, %entry ]
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%i.next = add nsw i64 %i, 1
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%exitcond = icmp eq i64 %i.next, %n
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br i1 true, label %loop, label %return
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return:
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ret void
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}
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