; RUN: opt -loop-vectorize -scalable-vectorization=off -force-vector-width=4 -prefer-predicate-over-epilogue=predicate-dont-vectorize -S < %s | FileCheck %s
; NOTE: These tests aren't really target-specific, but it's convenient to target AArch64
; so that TTI.isLegalMaskedLoad can return true.
target triple = "aarch64-linux-gnu"
; The original loop had an unconditional uniform load. Let's make sure
; we don't artificially create new predicated blocks for the load.
define void @uniform_load(i32* noalias %dst, i32* noalias readonly %src, i64 %n) #0 {
; CHECK-LABEL: @uniform_load(
; CHECK: vector.ph:
; CHECK: [[INIT_ACTIVE_LANE_MASK:%.*]] = call <4 x i1> @llvm.get.active.lane.mask.v4i1.i64(i64 0, i64 %n)
; CHECK: vector.body:
; CHECK-NEXT: [[IDX:%.*]] = phi i64 [ 0, %vector.ph ], [ [[IDX_NEXT:%.*]], %vector.body ]
; CHECK-NEXT: [[ACTIVE_LANE_MASK:%.*]] = phi <4 x i1> [ [[INIT_ACTIVE_LANE_MASK]], %vector.ph ], [ [[NEXT_ACTIVE_LANE_MASK:%.*]], %vector.body ]
; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[IDX]], 0
; CHECK-NEXT: [[LOAD_VAL:%.*]] = load i32, i32* %src, align 4
; CHECK-NOT: load i32, i32* %src, align 4
; CHECK-NEXT: [[TMP4:%.*]] = insertelement <4 x i32> poison, i32 [[LOAD_VAL]], i32 0
; CHECK-NEXT: [[TMP5:%.*]] = shufflevector <4 x i32> [[TMP4]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, i32* %dst, i64 [[TMP3]]
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, i32* [[TMP6]], i32 0
; CHECK-NEXT: [[STORE_PTR:%.*]] = bitcast i32* [[TMP7]] to <4 x i32>*
; CHECK-NEXT: call void @llvm.masked.store.v4i32.p0v4i32(<4 x i32> [[TMP5]], <4 x i32>* [[STORE_PTR]], i32 4, <4 x i1> [[ACTIVE_LANE_MASK]])
; CHECK-NEXT: [[IDX_NEXT]] = add i64 [[IDX]], 4
; CHECK-NEXT: [[NEXT_ACTIVE_LANE_MASK]] = call <4 x i1> @llvm.get.active.lane.mask.v4i1.i64(i64 [[IDX_NEXT]], i64 %n)
; CHECK-NEXT: [[NOT_ACTIVE_LANE_MASK:%.*]] = xor <4 x i1> [[NEXT_ACTIVE_LANE_MASK]], <i1 true, i1 true, i1 true, i1 true>
; CHECK-NEXT: [[FIRST_LANE_SET:%.*]] = extractelement <4 x i1> [[NOT_ACTIVE_LANE_MASK]], i32 0
; CHECK-NEXT: br i1 [[FIRST_LANE_SET]], label %middle.block, label %vector.body
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%val = load i32, i32* %src, align 4
%arrayidx = getelementptr inbounds i32, i32* %dst, i64 %indvars.iv
store i32 %val, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond.not = icmp eq i64 %indvars.iv.next, %n
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
; The original loop had a conditional uniform load. In this case we actually
; do need to perform conditional loads and so we end up using a gather instead.
; However, we at least ensure the mask is the overlap of the loop predicate
; and the original condition.
define void @cond_uniform_load(i32* nocapture %dst, i32* nocapture readonly %src, i32* nocapture readonly %cond, i64 %n) #0 {
; CHECK-LABEL: @cond_uniform_load(
; CHECK: vector.ph:
; CHECK: [[INIT_ACTIVE_LANE_MASK:%.*]] = call <4 x i1> @llvm.get.active.lane.mask.v4i1.i64(i64 0, i64 %n)
; CHECK: [[TMP1:%.*]] = insertelement <4 x i32*> poison, i32* %src, i32 0
; CHECK-NEXT: [[SRC_SPLAT:%.*]] = shufflevector <4 x i32*> [[TMP1]], <4 x i32*> poison, <4 x i32> zeroinitializer
; CHECK: vector.body:
; CHECK-NEXT: [[IDX:%.*]] = phi i64 [ 0, %vector.ph ], [ [[IDX_NEXT:%.*]], %vector.body ]
; CHECK-NEXT: [[ACTIVE_LANE_MASK:%.*]] = phi <4 x i1> [ [[INIT_ACTIVE_LANE_MASK]], %vector.ph ], [ [[NEXT_ACTIVE_LANE_MASK:%.*]], %vector.body ]
; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[IDX]], 0
; CHECK: [[COND_LOAD:%.*]] = call <4 x i32> @llvm.masked.load.v4i32.p0v4i32(<4 x i32>* {{%.*}}, i32 4, <4 x i1> [[ACTIVE_LANE_MASK]], <4 x i32> poison)
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq <4 x i32> [[COND_LOAD]], zeroinitializer
; CHECK-NEXT: [[TMP5:%.*]] = xor <4 x i1> [[TMP4]], <i1 true, i1 true, i1 true, i1 true>
; CHECK-NEXT: [[MASK:%.*]] = select <4 x i1> [[ACTIVE_LANE_MASK]], <4 x i1> [[TMP5]], <4 x i1> zeroinitializer
; CHECK-NEXT: call <4 x i32> @llvm.masked.gather.v4i32.v4p0i32(<4 x i32*> [[SRC_SPLAT]], i32 4, <4 x i1> [[MASK]], <4 x i32> undef)
entry:
br label %for.body
for.body: ; preds = %entry, %if.end
%index = phi i64 [ %index.next, %if.end ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, i32* %cond, i64 %index
%0 = load i32, i32* %arrayidx, align 4
%tobool.not = icmp eq i32 %0, 0
br i1 %tobool.not, label %if.end, label %if.then
if.then: ; preds = %for.body
%1 = load i32, i32* %src, align 4
br label %if.end
if.end: ; preds = %if.then, %for.body
%val.0 = phi i32 [ %1, %if.then ], [ 0, %for.body ]
%arrayidx1 = getelementptr inbounds i32, i32* %dst, i64 %index
store i32 %val.0, i32* %arrayidx1, align 4
%index.next = add nuw i64 %index, 1
%exitcond.not = icmp eq i64 %index.next, %n
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.inc, %entry
ret void
}
attributes #0 = { "target-features"="+neon,+sve,+v8.1a" vscale_range(2, 0) }