b85a402dd8
This patch adds a new preheader block the VPlan to place SCEV expansions expansions like the trip count. This preheader block is disconnected at the moment, as the bypass blocks of the skeleton are not yet modeled in VPlan. The preheader block is executed before skeleton creation, so the SCEV expansion results can be used during skeleton creation. At the moment, the trip count expression and induction steps are expanded in the new preheader. The remainder of SCEV expansions will be moved gradually in the future. D147965 will update skeleton creation to use the steps expanded in the pre-header to fix #58811. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D147964
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=8 -S -debug %s 2>&1 | FileCheck %s
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define void @iv_no_binary_op_in_descriptor(i1 %c, ptr %dst) {
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; CHECK-LABEL: LV: Checking a loop in 'iv_no_binary_op_in_descriptor'
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; CHECK: VPlan 'Initial VPlan for VF={8},UF>=1' {
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; CHECK-NEXT: Live-in vp<[[VEC_TC:%.+]]> = vector-trip-count
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; CHECK-NEXT: Live-in ir<1000> = original trip-count
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; CHECK-EMPTY:
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; CHECK-NEXT: vector.ph:
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; CHECK-NEXT: Successor(s): vector loop
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; CHECK-EMPTY:
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; CHECK-NEXT: <x1> vector loop: {
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; CHECK-NEXT: vector.body:
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; CHECK-NEXT: EMIT vp<[[CAN_IV:%.+]]> = CANONICAL-INDUCTION
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; CHECK-NEXT: WIDEN-INDUCTION %iv = phi 0, %iv.next.p, ir<1>
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; CHECK-NEXT: vp<[[STEPS:%.+]]> = SCALAR-STEPS vp<[[CAN_IV]]>, ir<1>
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; CHECK-NEXT: CLONE ir<%gep> = getelementptr ir<%dst>, vp<[[STEPS:%.+]]>
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; CHECK-NEXT: WIDEN store ir<%gep>, ir<%iv>
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; CHECK-NEXT: EMIT vp<[[CAN_INC:%.+]]> = VF * UF +(nuw) vp<[[CAN_IV]]>
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; CHECK-NEXT: EMIT branch-on-count vp<[[CAN_INC]]> vp<[[VEC_TC]]>
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; CHECK-NEXT: No successors
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; CHECK-NEXT: }
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; CHECK-NEXT: Successor(s): middle.block
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; CHECK-EMPTY:
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; CHECK-NEXT: middle.block:
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; CHECK-NEXT: No successors
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; CHECK-NEXT: }
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;
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entry:
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br label %loop.header
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loop.header:
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%iv = phi i64 [ 0, %entry ], [ %iv.next.p, %loop.latch ]
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%gep = getelementptr inbounds i64, ptr %dst, i64 %iv
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store i64 %iv, ptr %gep, align 8
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%iv.next = add i64 %iv, 1
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br label %loop.latch
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loop.latch:
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%iv.next.p = phi i64 [ %iv.next, %loop.header ]
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%exitcond.not = icmp eq i64 %iv.next.p, 1000
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br i1 %exitcond.not, label %exit, label %loop.header
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exit:
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ret void
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}
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