8f3d16905d
A backedge-taken count doesn't refer to memory; returning a pointer type is nonsense. So make sure we always return an integer. The obvious way to do this would be to just convert the operands of the icmp to integers, but that doesn't quite work out at the moment: isLoopEntryGuardedByCond currently gets confused by ptrtoint operations. So we perform the ptrtoint conversion late for lt/gt operations. The test changes are mostly innocuous. The most interesting changes are more complex SCEV expressions of the form "(-1 * (ptrtoint i8* %ptr to i64)) + %ptr)". This is expected: we can't fold this to zero because we need to preserve the pointer base. The call to isLoopEntryGuardedByCond in howFarToZero is less precise because of ptrtoint operations; this shows up in the function pr46786_c26_char in ptrtoint.ll. Fixing it here would require more complex refactoring. It should eventually be fixed by future improvements to isImpliedCond. See https://bugs.llvm.org/show_bug.cgi?id=46786 for context. Differential Revision: https://reviews.llvm.org/D103656
108 lines
5.6 KiB
LLVM
108 lines
5.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -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(i8* %arr, i8 %t9) {
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; CHECK-LABEL: @widget(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[ARR2:%.*]] = ptrtoint i8* [[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 i8* [ [[ARR]], [[BB:%.*]] ], [ null, [[BB6]] ]
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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_LCSSA:%.*]] = phi i8* [ [[T1_0]], [[BB6]] ]
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; CHECK-NEXT: [[T1_0_LCSSA1:%.*]] = ptrtoint i8* [[T1_0_LCSSA]] to i64
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; CHECK-NEXT: [[TMP0:%.*]] = trunc i64 [[T1_0_LCSSA1]] to i32
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[ARR2]] to i32
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; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[TMP0]], [[TMP1]]
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; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP2]], 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: [[TMP3:%.*]] = add i64 [[T1_0_LCSSA1]], -1
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; CHECK-NEXT: [[TMP4:%.*]] = sub i64 [[TMP3]], [[ARR2]]
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; CHECK-NEXT: [[TMP5:%.*]] = trunc i64 [[TMP4]] to i8
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; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 1, i8 [[TMP5]])
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; CHECK-NEXT: [[MUL_RESULT:%.*]] = extractvalue { i8, i1 } [[MUL]], 0
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; CHECK-NEXT: [[MUL_OVERFLOW:%.*]] = extractvalue { i8, i1 } [[MUL]], 1
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; CHECK-NEXT: [[TMP6:%.*]] = add i8 1, [[MUL_RESULT]]
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; CHECK-NEXT: [[TMP7:%.*]] = sub i8 1, [[MUL_RESULT]]
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; CHECK-NEXT: [[TMP8:%.*]] = icmp sgt i8 [[TMP7]], 1
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; CHECK-NEXT: [[TMP9:%.*]] = icmp slt i8 [[TMP6]], 1
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; CHECK-NEXT: [[TMP10:%.*]] = select i1 false, i1 [[TMP8]], i1 [[TMP9]]
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; CHECK-NEXT: [[TMP11:%.*]] = icmp ugt i64 [[TMP4]], 255
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; CHECK-NEXT: [[TMP12:%.*]] = or i1 [[TMP10]], [[TMP11]]
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; CHECK-NEXT: [[TMP13:%.*]] = or i1 [[TMP12]], [[MUL_OVERFLOW]]
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; CHECK-NEXT: [[TMP14:%.*]] = or i1 false, [[TMP13]]
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; CHECK-NEXT: br i1 [[TMP14]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP2]], 4
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP2]], [[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:%.*]], i32 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: [[TMP15:%.*]] = add <4 x i8> [[VEC_IND]], <i8 1, i8 1, i8 1, i8 1>
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; CHECK-NEXT: [[TMP16:%.*]] = extractelement <4 x i8> [[TMP15]], i32 0
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; CHECK-NEXT: [[TMP17:%.*]] = getelementptr inbounds i8, i8* [[ARR]], i8 [[TMP16]]
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; CHECK-NEXT: [[TMP18:%.*]] = icmp slt <4 x i8> [[TMP15]], [[BROADCAST_SPLAT]]
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; CHECK-NEXT: [[TMP19:%.*]] = zext <4 x i1> [[TMP18]] to <4 x i8>
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; CHECK-NEXT: [[TMP20:%.*]] = getelementptr inbounds i8, i8* [[TMP17]], i32 0
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; CHECK-NEXT: [[TMP21:%.*]] = bitcast i8* [[TMP20]] to <4 x i8>*
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; CHECK-NEXT: store <4 x i8> [[TMP19]], <4 x i8>* [[TMP21]], 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]], <i8 4, i8 4, i8 4, i8 4>
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; CHECK-NEXT: [[TMP22:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[TMP22]], 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 [[TMP2]], [[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, i8* [[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]], i8* [[PTR]], align 1
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; CHECK-NEXT: [[EC:%.*]] = icmp eq i8* [[T1_0_LCSSA]], [[PTR]]
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; CHECK-NEXT: br i1 [[EC]], label [[FOR_EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP2:![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 i8* [ %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, i8* %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, i8* %ptr
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%ec = icmp eq i8* %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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