d4a8fc3a87
This patch adds a new BranchOnCount VPInstruction opcode with 2 operands. It first compares its 2 operands (increment of canonical induction and vector trip count), followed by a branch to either the exit block or back to the vector header. It must be the last recipe in the exit block of the topmost vector loop region. This extracts parts from D113224 and was discussed in D113223. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D116479
67 lines
2.5 KiB
LLVM
67 lines
2.5 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -instcombine -debug-only=loop-vectorize -disable-output -print-after=instcombine 2>&1 -enable-new-pm=0 | FileCheck %s
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; RUN: opt < %s -passes=loop-vectorize,instcombine -force-vector-width=4 -force-vector-interleave=1 -debug-only=loop-vectorize -disable-output -print-after=instcombine 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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; CHECK-LABEL: more_than_one_use
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;
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; PR30627. Check that a compare instruction with more than one use is not
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; recognized as uniform and is vectorized.
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;
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; CHECK-NOT: Found uniform instruction: %cond = icmp slt i64 %i.next, %n
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; CHECK: vector.body
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; CHECK: %[[I:.+]] = add nuw nsw <4 x i64> %vec.ind, <i64 1, i64 1, i64 1, i64 1>
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; CHECK: icmp slt <4 x i64> %[[I]], %broadcast.splat
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; CHECK: br i1 {{.*}}, label %middle.block, label %vector.body
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;
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define i32 @more_than_one_use(i32* %a, i64 %n) {
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entry:
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br label %for.body
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for.body:
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%i = phi i64 [ %i.next, %for.body ], [ 0, %entry ]
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%r = phi i32 [ %tmp3, %for.body ], [ 0, %entry ]
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%i.next = add nuw nsw i64 %i, 1
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%cond = icmp slt i64 %i.next, %n
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%tmp0 = select i1 %cond, i64 %i.next, i64 0
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%tmp1 = getelementptr inbounds i32, i32* %a, i64 %tmp0
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%tmp2 = load i32, i32* %tmp1, align 8
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%tmp3 = add i32 %r, %tmp2
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br i1 %cond, label %for.body, label %for.end
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for.end:
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%tmp4 = phi i32 [ %tmp3, %for.body ]
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ret i32 %tmp4
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}
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; Check for crash exposed by D76992.
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; CHECK: VPlan 'Initial VPlan for VF={4},UF>=1' {
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; CHECK-NEXT: Live-in vp<[[VEC_TC:%.+]]> = vector-trip-count
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; CHECK-EMPTY:
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; CHECK-NEXT: <x1> vector loop: {
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; CHECK-NEXT: loop:
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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
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; CHECK-NEXT: WIDEN ir<%cond0> = icmp ir<%iv>, ir<13>
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; CHECK-NEXT: WIDEN-SELECT ir<%s> = select ir<%cond0>, ir<10>, ir<20>
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; CHECK-NEXT: EMIT vp<[[CAN_IV_NEXT:%.+]]> = VF * UF + vp<[[CAN_IV]]>
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; CHECK-NEXT: EMIT branch-on-count vp<[[CAN_IV_NEXT]]> vp<[[VEC_TC]]>
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; CHECK-NEXT: No successor
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; CHECK-NEXT: }
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define void @test() {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
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%cond0 = icmp ult i64 %iv, 13
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%s = select i1 %cond0, i32 10, i32 20
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 14
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br i1 %exitcond, label %exit, label %loop
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exit: ; preds = %loop
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ret void
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}
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