1d9775f684
The canonical form preferred by instcombine is to use 64-bit values for the index when it is a constant. We should try to do the same where possible in the loop vectoriser as this reduces churn in the compiler. It also makes other work easier, such as removing extra unnecessary passes on the RUN line in the test directory which I plan to do afterwards.
99 lines
4.9 KiB
LLVM
99 lines
4.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 | FileCheck %s
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; Check that we can vectorize this loop without crashing.
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define i8 @widget(ptr %arr, i8 %t9) {
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; CHECK-LABEL: @widget(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[ARR1:%.*]] = ptrtoint ptr [[ARR:%.*]] to i64
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; CHECK-NEXT: br label [[BB6:%.*]]
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; CHECK: bb6:
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; CHECK-NEXT: [[T1_0:%.*]] = phi ptr [ [[ARR]], [[BB:%.*]] ], [ null, [[BB6]] ]
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; CHECK-NEXT: [[T1_0_LCSSA2:%.*]] = ptrtoint ptr [[T1_0]] to i64
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; CHECK-NEXT: [[C:%.*]] = call i1 @cond()
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; CHECK-NEXT: br i1 [[C]], label [[FOR_PREHEADER:%.*]], label [[BB6]]
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; CHECK: for.preheader:
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; CHECK-NEXT: [[T1_0_LCSSA1:%.*]] = phi ptr [ [[T1_0]], [[BB6]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = trunc i64 [[ARR1]] to i32
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; CHECK-NEXT: [[TMP1:%.*]] = sub i32 0, [[TMP0]]
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; CHECK-NEXT: [[TMP2:%.*]] = trunc i64 [[T1_0_LCSSA2]] to i32
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; CHECK-NEXT: [[TMP3:%.*]] = add i32 [[TMP1]], [[TMP2]]
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; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP3]], 4
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; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
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; CHECK: vector.scevcheck:
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; CHECK-NEXT: [[TMP4:%.*]] = sub i64 -1, [[ARR1]]
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; CHECK-NEXT: [[TMP5:%.*]] = add i64 [[TMP4]], [[T1_0_LCSSA2]]
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; CHECK-NEXT: [[TMP6:%.*]] = trunc i64 [[TMP5]] to i8
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; CHECK-NEXT: [[TMP7:%.*]] = add i8 1, [[TMP6]]
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; CHECK-NEXT: [[TMP8:%.*]] = icmp slt i8 [[TMP7]], 1
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; CHECK-NEXT: [[TMP9:%.*]] = icmp ugt i64 [[TMP5]], 255
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; CHECK-NEXT: [[TMP10:%.*]] = or i1 [[TMP8]], [[TMP9]]
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; CHECK-NEXT: br i1 [[TMP10]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP3]], 4
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP3]], [[N_MOD_VF]]
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; CHECK-NEXT: [[IND_END:%.*]] = trunc i32 [[N_VEC]] to i8
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i8> poison, i8 [[T9:%.*]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i8> [[BROADCAST_SPLATINSERT]], <4 x i8> 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 i8> [ <i8 0, i8 1, i8 2, i8 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP11:%.*]] = add <4 x i8> [[VEC_IND]], splat (i8 1)
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; CHECK-NEXT: [[TMP12:%.*]] = extractelement <4 x i8> [[TMP11]], i64 0
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; CHECK-NEXT: [[TMP13:%.*]] = getelementptr inbounds i8, ptr [[ARR]], i8 [[TMP12]]
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; CHECK-NEXT: [[TMP14:%.*]] = icmp slt <4 x i8> [[TMP11]], [[BROADCAST_SPLAT]]
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; CHECK-NEXT: [[TMP15:%.*]] = zext <4 x i1> [[TMP14]] to <4 x i8>
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; CHECK-NEXT: store <4 x i8> [[TMP15]], ptr [[TMP13]], align 1
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i8> [[VEC_IND]], splat (i8 4)
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; CHECK-NEXT: [[TMP17:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[TMP17]], 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 i32 [[TMP3]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[CMP_N]], label [[FOR_EXIT:%.*]], label [[SCALAR_PH]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i8 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 0, [[FOR_PREHEADER]] ], [ 0, [[VECTOR_SCEVCHECK]] ]
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[IV:%.*]] = phi i8 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add i8 [[IV]], 1
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i8, ptr [[ARR]], i8 [[IV_NEXT]]
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; CHECK-NEXT: [[T3_I:%.*]] = icmp slt i8 [[IV_NEXT]], [[T9]]
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; CHECK-NEXT: [[T3_I8:%.*]] = zext i1 [[T3_I]] to i8
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; CHECK-NEXT: store i8 [[T3_I8]], ptr [[PTR]], align 1
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; CHECK-NEXT: [[EC:%.*]] = icmp eq ptr [[T1_0_LCSSA1]], [[PTR]]
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; CHECK-NEXT: br i1 [[EC]], label [[FOR_EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
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; CHECK: for.exit:
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; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i8 [ [[IV_NEXT]], [[FOR_BODY]] ], [ [[IND_END]], [[MIDDLE_BLOCK]] ]
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; CHECK-NEXT: ret i8 [[IV_NEXT_LCSSA]]
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;
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bb:
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br label %bb6
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bb6:
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%t1.0 = phi ptr [ %arr, %bb ], [ null, %bb6 ]
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%c = call i1 @cond()
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br i1 %c, label %for.preheader, label %bb6
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for.preheader:
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br label %for.body
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for.body:
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%iv = phi i8 [ %iv.next, %for.body ], [ 0, %for.preheader ]
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%iv.next = add i8 %iv, 1
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%ptr = getelementptr inbounds i8, ptr %arr, i8 %iv.next
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%t3.i = icmp slt i8 %iv.next, %t9
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%t3.i8 = zext i1 %t3.i to i8
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store i8 %t3.i8, ptr %ptr
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%ec = icmp eq ptr %t1.0, %ptr
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br i1 %ec, label %for.exit, label %for.body
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for.exit:
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%iv.next.lcssa = phi i8 [ %iv.next, %for.body ]
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ret i8 %iv.next.lcssa
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}
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declare i1 @cond()
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