derek.holloway
7502bf64a4
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59 lines
3.6 KiB
LLVM
59 lines
3.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
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; RUN: opt < %s -S -p loop-vectorize -force-vector-width=4 -tail-folding-policy=prefer-fold-tail | FileCheck %s
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define i32 @f(ptr noalias %p, i32 %start, i32 %step, i32 %n) {
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; CHECK-LABEL: define i32 @f(
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; CHECK-SAME: ptr noalias [[P:%.*]], i32 [[START:%.*]], i32 [[STEP:%.*]], i32 [[N:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[N]], 1
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; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
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; CHECK: [[VECTOR_PH]]:
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; CHECK-NEXT: [[N_RND_UP:%.*]] = add i32 [[TMP0]], 3
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; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[N_RND_UP]], 4
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[N_RND_UP]], [[N_MOD_VF]]
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; CHECK-NEXT: [[TRIP_COUNT_MINUS_1:%.*]] = sub i32 [[TMP0]], 1
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TRIP_COUNT_MINUS_1]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <4 x i32> poison, i32 [[START]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT1]], <4 x i32> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <4 x i32> poison, i32 [[STEP]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT3]], <4 x i32> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[TMP1:%.*]] = mul <4 x i32> <i32 0, i32 1, i32 2, i32 3>, [[BROADCAST_SPLAT4]]
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; CHECK-NEXT: [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT2]], [[TMP1]]
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; CHECK-NEXT: [[TMP2:%.*]] = shl i32 [[STEP]], 2
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT5:%.*]] = insertelement <4 x i32> poison, i32 [[TMP2]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT6:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT5]], <4 x i32> poison, <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 i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ [[INDUCTION]], %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[VEC_IV:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT8:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[INDEX_NEXT]] = add i32 [[INDEX]], 4
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], [[BROADCAST_SPLAT6]]
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; CHECK-NEXT: [[VEC_IND_NEXT8]] = add nuw <4 x i32> [[VEC_IV]], splat (i32 4)
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; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[TMP3]], label %[[SCALAR_PH:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: [[SCALAR_PH]]:
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; CHECK-NEXT: [[TMP4:%.*]] = icmp ugt <4 x i32> [[VEC_IV]], [[BROADCAST_SPLAT]]
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; CHECK-NEXT: [[FIRST_INACTIVE_LANE:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP4]], i1 false)
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; CHECK-NEXT: [[LAST_ACTIVE_LANE:%.*]] = sub i64 [[FIRST_INACTIVE_LANE]], 1
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; CHECK-NEXT: [[IV2_LCSSA:%.*]] = extractelement <4 x i32> [[VEC_IND]], i64 [[LAST_ACTIVE_LANE]]
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: ret i32 [[IV2_LCSSA]]
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;
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %loop]
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%iv2 = phi i32 [%start, %entry], [%iv2.next, %loop]
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%iv.next = add i32 %iv, 1
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%iv2.next = add i32 %iv2, %step
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%ec = icmp eq i32 %iv, %n
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br i1 %ec, label %exit, label %loop
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exit:
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ret i32 %iv2
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}
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