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Even when we don't create a remainder loop (that is, when we unroll by 2), we may duplicate nested loops into the remainder. This is complicated by the fact the remainder may itself be either inserted into an outer loop, or at the top level. In the latter case, we may need to create new top-level loops. Differential Revision: https://reviews.llvm.org/D29156 llvm-svn: 293124
157 lines
5.0 KiB
LLVM
157 lines
5.0 KiB
LLVM
; This test checks that nested loops are revisited in various scenarios when
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; unrolling. Note that if we ever start doing outer loop peeling a test case
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; for that should be added here that will look essentially like a hybrid of the
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; current two cases.
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;
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; RUN: opt < %s -disable-output -debug-pass-manager 2>&1 \
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; RUN: -passes='require<opt-remark-emit>,loop(unroll)' \
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; RUN: | FileCheck %s
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;
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; Also run in a special mode that visits children.
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; RUN: opt < %s -disable-output -debug-pass-manager -unroll-revisit-child-loops 2>&1 \
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; RUN: -passes='require<opt-remark-emit>,loop(unroll)' \
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; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-CHILDREN
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; Basic test is fully unrolled and we revisit the post-unroll new sibling
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; loops, including the ones that used to be child loops.
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define void @full_unroll(i1* %ptr) {
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; CHECK-LABEL: FunctionToLoopPassAdaptor{{.*}} on full_unroll
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; CHECK-NOT: LoopUnrollPass
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entry:
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br label %l0
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l0:
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%cond.0 = load volatile i1, i1* %ptr
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br i1 %cond.0, label %l0.0.ph, label %exit
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l0.0.ph:
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br label %l0.0
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l0.0:
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%iv = phi i32 [ %iv.next, %l0.0.latch ], [ 0, %l0.0.ph ]
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%iv.next = add i32 %iv, 1
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br label %l0.0.0.ph
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l0.0.0.ph:
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br label %l0.0.0
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l0.0.0:
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%cond.0.0.0 = load volatile i1, i1* %ptr
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br i1 %cond.0.0.0, label %l0.0.0, label %l0.0.1.ph
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; CHECK: LoopUnrollPass on Loop at depth 3 containing: %l0.0.0<header>
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; CHECK-NOT: LoopUnrollPass
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l0.0.1.ph:
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br label %l0.0.1
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l0.0.1:
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%cond.0.0.1 = load volatile i1, i1* %ptr
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br i1 %cond.0.0.1, label %l0.0.1, label %l0.0.latch
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; CHECK: LoopUnrollPass on Loop at depth 3 containing: %l0.0.1<header>
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; CHECK-NOT: LoopUnrollPass
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l0.0.latch:
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%cmp = icmp slt i32 %iv.next, 2
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br i1 %cmp, label %l0.0, label %l0.latch
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0
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; CHECK-NOT: LoopUnrollPass
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;
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; Unrolling occurs, so we visit what were the inner loops twice over. First we
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; visit their clones, and then we visit the original loops re-parented.
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.1.1<header>
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; CHECK-NOT: LoopUnrollPass
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.0.1<header>
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; CHECK-NOT: LoopUnrollPass
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.1<header>
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; CHECK-NOT: LoopUnrollPass
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.0<header>
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; CHECK-NOT: LoopUnrollPass
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l0.latch:
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br label %l0
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; CHECK: LoopUnrollPass on Loop at depth 1 containing: %l0<header>
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; CHECK-NOT: LoopUnrollPass
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exit:
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ret void
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}
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; Now we test forced runtime partial unrolling with metadata. Here we end up
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; duplicating child loops without changing their structure and so they aren't by
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; default visited, but will be visited with a special parameter.
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define void @partial_unroll(i32 %count, i1* %ptr) {
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; CHECK-LABEL: FunctionToLoopPassAdaptor{{.*}} on partial_unroll
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; CHECK-NOT: LoopUnrollPass
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entry:
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br label %l0
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l0:
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%cond.0 = load volatile i1, i1* %ptr
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br i1 %cond.0, label %l0.0.ph, label %exit
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l0.0.ph:
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br label %l0.0
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l0.0:
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%iv = phi i32 [ %iv.next, %l0.0.latch ], [ 0, %l0.0.ph ]
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%iv.next = add i32 %iv, 1
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br label %l0.0.0.ph
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l0.0.0.ph:
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br label %l0.0.0
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l0.0.0:
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%cond.0.0.0 = load volatile i1, i1* %ptr
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br i1 %cond.0.0.0, label %l0.0.0, label %l0.0.1.ph
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; CHECK: LoopUnrollPass on Loop at depth 3 containing: %l0.0.0<header>
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; CHECK-NOT: LoopUnrollPass
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l0.0.1.ph:
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br label %l0.0.1
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l0.0.1:
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%cond.0.0.1 = load volatile i1, i1* %ptr
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br i1 %cond.0.0.1, label %l0.0.1, label %l0.0.latch
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; CHECK: LoopUnrollPass on Loop at depth 3 containing: %l0.0.1<header>
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; CHECK-NOT: LoopUnrollPass
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l0.0.latch:
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%cmp = icmp slt i32 %iv.next, %count
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br i1 %cmp, label %l0.0, label %l0.latch, !llvm.loop !1
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0
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; CHECK-NOT: LoopUnrollPass
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;
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; Partial unrolling occurs which introduces both new child loops and new sibling
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; loops. We only visit the child loops in a special mode, not by default.
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; CHECK-CHILDREN: LoopUnrollPass on Loop at depth 3 containing: %l0.0.0<header>
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; CHECK-CHILDREN-NOT: LoopUnrollPass
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; CHECK-CHILDREN: LoopUnrollPass on Loop at depth 3 containing: %l0.0.1<header>
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; CHECK-CHILDREN-NOT: LoopUnrollPass
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; CHECK-CHILDREN: LoopUnrollPass on Loop at depth 3 containing: %l0.0.0.1<header>
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; CHECK-CHILDREN-NOT: LoopUnrollPass
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; CHECK-CHILDREN: LoopUnrollPass on Loop at depth 3 containing: %l0.0.1.1<header>
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; CHECK-CHILDREN-NOT: LoopUnrollPass
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;
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; When we revisit children, we also revisit the current loop.
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; CHECK-CHILDREN: LoopUnrollPass on Loop at depth 2 containing: %l0.0<header>
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; CHECK-CHILDREN-NOT: LoopUnrollPass
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;
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; Revisit the children of the outer loop that are part of the prologue.
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;
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.0.prol<header>
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; CHECK-NOT: LoopUnrollPass
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; CHECK: LoopUnrollPass on Loop at depth 2 containing: %l0.0.1.prol<header>
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; CHECK-NOT: LoopUnrollPass
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l0.latch:
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br label %l0
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; CHECK: LoopUnrollPass on Loop at depth 1 containing: %l0<header>
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; CHECK-NOT: LoopUnrollPass
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exit:
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ret void
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}
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!1 = !{!1, !2}
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!2 = !{!"llvm.loop.unroll.count", i32 2}
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