a5891fa4d2
This patch starts initial modeling of VF * UF in VPlan. Initially, introduce a dedicated VFxUF VPValue, which is then populated during VPlan::prepareToExecute. Initially, the VF * UF applies only to the main vector loop region. Once we extend the scope of VPlan in the future, we may want to associate different VFxUFs with different vector loop regions (e.g. the epilogue vector loop) This allows explicitly parameterizing recipes that rely on the VF * UF, like the canonical induction increment. At the moment, this mainly helps to avoid generating some duplicated calls to vscale with scalable vectors. It should also allow using EVL as induction increments explicitly in D99750. Referring to VF * UF is also needed in other places that we plan to migrate to VPlan, like the minimum trip count check during skeleton creation. The first version creates the value for VF * UF directly in prepareToExecute to limit the scope of the patch. A follow-on patch will model VF * UF computation explicitly in VPlan using recipes. Moved from Phabricator (https://reviews.llvm.org/D157322)
103 lines
5.3 KiB
LLVM
103 lines
5.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=loop-vectorize,dce,instcombine -force-target-instruction-cost=1 \
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; RUN: -prefer-predicate-over-epilogue=scalar-epilogue < %s -S | FileCheck %s
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target triple = "aarch64-linux-gnu"
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; Test a case where the vectorised induction variable is used to
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; generate a mask:
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; for (long long i = 0; i < n; i++) {
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; if (i & 0x1)
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; a[i] = b[i];
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; }
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define void @cond_ind64(ptr noalias nocapture %a, ptr noalias nocapture readonly %b, i64 %n) #0 {
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; CHECK-LABEL: @cond_ind64(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
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; CHECK-NEXT: [[TMP1:%.*]] = shl i64 [[TMP0]], 2
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; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ugt i64 [[TMP1]], [[N:%.*]]
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; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
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; CHECK-NEXT: [[TMP3:%.*]] = shl i64 [[TMP2]], 2
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; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP3]]
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
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; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
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; CHECK-NEXT: [[TMP5:%.*]] = shl i64 [[TMP4]], 2
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; CHECK-NEXT: [[TMP6:%.*]] = call <vscale x 4 x i64> @llvm.experimental.stepvector.nxv4i64()
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; CHECK-NEXT: [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
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; CHECK-NEXT: [[TMP8:%.*]] = shl i64 [[TMP7]], 2
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; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 4 x i64> poison, i64 [[TMP8]], i64 0
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; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <vscale x 4 x i64> [[DOTSPLATINSERT]], <vscale x 4 x i64> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[VEC_IND:%.*]] = phi <vscale x 4 x i64> [ [[TMP6]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP9:%.*]] = trunc <vscale x 4 x i64> [[VEC_IND]] to <vscale x 4 x i1>
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; CHECK-NEXT: [[TMP10:%.*]] = getelementptr i32, ptr [[B:%.*]], i64 [[INDEX]]
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; CHECK-NEXT: [[WIDE_MASKED_LOAD:%.*]] = call <vscale x 4 x i32> @llvm.masked.load.nxv4i32.p0(ptr [[TMP10]], i32 4, <vscale x 4 x i1> [[TMP9]], <vscale x 4 x i32> poison)
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; CHECK-NEXT: [[TMP11:%.*]] = getelementptr i32, ptr [[A:%.*]], i64 [[INDEX]]
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; CHECK-NEXT: call void @llvm.masked.store.nxv4i32.p0(<vscale x 4 x i32> [[WIDE_MASKED_LOAD]], ptr [[TMP11]], i32 4, <vscale x 4 x i1> [[TMP9]])
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP5]]
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i64> [[VEC_IND]], [[DOTSPLAT]]
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; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[TMP12]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N_MOD_VF]], 0
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; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[I_08:%.*]] = phi i64 [ [[INC:%.*]], [[FOR_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
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; CHECK-NEXT: [[AND:%.*]] = and i64 [[I_08]], 1
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; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i64 [[AND]], 0
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; CHECK-NEXT: br i1 [[TOBOOL_NOT]], label [[FOR_INC]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[I_08]]
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; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I_08]]
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; CHECK-NEXT: store i32 [[TMP13]], ptr [[ARRAYIDX1]], align 4
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; CHECK-NEXT: br label [[FOR_INC]]
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; CHECK: for.inc:
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; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[I_08]], 1
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; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INC]], [[N]]
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; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.08 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%and = and i64 %i.08, 1
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%tobool.not = icmp eq i64 %and, 0
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br i1 %tobool.not, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%arrayidx = getelementptr inbounds i32, ptr %b, i64 %i.08
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%0 = load i32, ptr %arrayidx, align 4
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%arrayidx1 = getelementptr inbounds i32, ptr %a, i64 %i.08
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store i32 %0, ptr %arrayidx1, align 4
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%inc = add nuw nsw i64 %i.08, 1
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%exitcond.not = icmp eq i64 %inc, %n
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br i1 %exitcond.not, label %exit, label %for.body, !llvm.loop !0
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exit: ; preds = %for.inc
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ret void
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}
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attributes #0 = { "target-features"="+sve" }
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!0 = distinct !{!0, !1, !2, !3, !4, !5}
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!1 = !{!"llvm.loop.mustprogress"}
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!2 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
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!3 = !{!"llvm.loop.vectorize.enable", i1 true}
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!4 = !{!"llvm.loop.vectorize.width", i32 4}
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!5 = !{!"llvm.loop.interleave.count", i32 1}
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