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0a6bbc1c79
Added some tests despite being NFC, since it looks like nothing was exercising the "all incoming values to exit PHIs are same" logic. llvm-svn: 268407
81 lines
1.6 KiB
LLVM
81 lines
1.6 KiB
LLVM
; RUN: opt < %s -loop-deletion -S | FileCheck %s
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; Checks whether dead loops with multiple exits can be eliminated
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define void @foo(i64 %n, i64 %m) nounwind {
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; CHECK-LABEL: @foo(
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; CHECK: entry:
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; CHECK-NEXT: br label %return
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; CHECK: return:
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; CHECK-NEXT: ret void
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entry:
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br label %bb
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bb:
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%x.0 = phi i64 [ 0, %entry ], [ %t0, %bb2 ]
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%t0 = add i64 %x.0, 1
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%t1 = icmp slt i64 %x.0, %n
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br i1 %t1, label %bb2, label %return
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bb2:
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%t2 = icmp slt i64 %x.0, %m
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br i1 %t1, label %bb, label %return
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return:
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ret void
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}
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define i64 @bar(i64 %n, i64 %m) nounwind {
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; CHECK-LABEL: @bar(
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; CHECK: entry:
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; CHECK-NEXT: br label %return
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; CHECK: return:
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; CHECK-NEXT: ret i64 10
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entry:
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br label %bb
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bb:
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%x.0 = phi i64 [ 0, %entry ], [ %t0, %bb3 ]
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%t0 = add i64 %x.0, 1
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%t1 = icmp slt i64 %x.0, %n
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br i1 %t1, label %bb2, label %return
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bb2:
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%t2 = icmp slt i64 %x.0, %m
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br i1 %t2, label %bb3, label %return
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bb3:
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%t3 = icmp slt i64 %x.0, %m
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br i1 %t3, label %bb, label %return
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return:
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%x.lcssa = phi i64 [ 10, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
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ret i64 %x.lcssa
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}
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define i64 @baz(i64 %n, i64 %m) nounwind {
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; CHECK-LABEL: @baz(
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; CHECK: return:
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; CHECK-NEXT: %x.lcssa = phi i64 [ 12, %bb ], [ 10, %bb2 ]
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; CHECK-NEXT: ret i64 %x.lcssa
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entry:
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br label %bb
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bb:
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%x.0 = phi i64 [ 0, %entry ], [ %t0, %bb3 ]
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%t0 = add i64 %x.0, 1
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%t1 = icmp slt i64 %x.0, %n
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br i1 %t1, label %bb2, label %return
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bb2:
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%t2 = icmp slt i64 %x.0, %m
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br i1 %t2, label %bb3, label %return
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bb3:
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%t3 = icmp slt i64 %x.0, %m
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br i1 %t3, label %bb, label %return
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return:
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%x.lcssa = phi i64 [ 12, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
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ret i64 %x.lcssa
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}
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