derek.holloway
7502bf64a4
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48 lines
1.5 KiB
LLVM
48 lines
1.5 KiB
LLVM
; RUN: opt <%s -p "print<scalar-evolution>" -disable-output 2>&1 | FileCheck %s
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; RUN: opt <%s -p "loop(loop-idiom),print<scalar-evolution>" -disable-output 2>&1 | FileCheck %s
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; CHECK: backedge-taken count is i64 1
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; IR corresponds to the following C test:
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; extern char a[];
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; void foo() {
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; for (long c = 0; c < 6; c += -2078836808675943215)
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; for (long d; d < 6; d++)
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; a[c + d] = 0;
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; }
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@a = external global [0 x i8]
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define void @foo() {
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entry:
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br label %outerL
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outerL: ; preds = %entry, %outerLatch
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%e = phi i64 [ poison, %entry ], [ %lcssa, %outerLatch ]
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%c = phi i64 [ 0, %entry ], [ %c.next, %outerLatch ]
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%e.cmp = icmp slt i64 %e, 6
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br i1 %e.cmp, label %innerL, label %outerLatch
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innerL: ; preds = %outerL, %innerL
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%d = phi i64 [ %d.next, %innerL ], [ %e, %outerL ]
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%add = add nsw i64 %d, %c
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%arrayidx = getelementptr inbounds [0 x i8], ptr @a, i64 0, i64 %add
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store i8 0, ptr %arrayidx
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%d.next = add nsw i64 %d, 1
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%d.cmp = icmp slt i64 %d, 5
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br i1 %d.cmp, label %innerL, label %outerLatch, !llvm.loop !0
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outerLatch: ; preds = %innerL, %outerL
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%lcssa = phi i64 [ %e, %outerL ], [ %d.next, %innerL ]
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%c.next = add nsw i64 %c, -2078836808675943215
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%c.cmp = icmp slt i64 %c, 2078836808675943221
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br i1 %c.cmp, label %outerL, label %exit, !llvm.loop !1
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exit: ; preds = %outerLatch
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ret void
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}
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!0 = distinct !{!0, !2}
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!1 = distinct !{!1, !2}
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!2 = !{!"llvm.loop.mustprogress"}
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