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[LV,LAA] Add test cases with pointer phis in loops.
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Pre-commits tests for D101286.
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@fhahn
fhahn committed Apr 27, 2021
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183 changes: 183 additions & 0 deletions llvm/test/Analysis/LoopAccessAnalysis/pointer-phis.ll
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; RUN: opt -loop-accesses -analyze -enable-new-pm=0 < %s | FileCheck %s
; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s

%s1 = type { [32000 x double], [32000 x double], [32000 x double] }

define i32 @load_with_pointer_phi_no_runtime_checks(%s1* %data) {
; CHECK-LABEL: load_with_pointer_phi_no_runtime_checks
; CHECK-NEXT: loop.header:
; CHECK-NEXT: Report: cannot identify array bounds
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds %s1, %s1 * %data, i64 0, i32 0, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 1, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 2, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %gep.2.sink, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %arrayidx, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_no_runtime_checks(%s1* %data) {
; CHECK-LABEL: 'store_with_pointer_phi_no_runtime_checks'
; CHECK-NEXT: loop.header:
; CHECK-NEXT: Report: cannot identify array bounds
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds %s1, %s1 * %data, i64 0, i32 0, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 1, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 2, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %gep.2.sink, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_runtime_checks(double* %A, double* %B, double* %C) {
; CHECK-LABEL: 'store_with_pointer_phi_runtime_checks'
; CHECK-NEXT: loop.header:
; CHECK-NEXT: Report: cannot identify array bounds
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds double, double* %B, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds double, double* %C, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %gep.2.sink, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @load_with_pointer_phi_outside_loop(double* %A, double* %B, double* %C, i1 %c.0, i1 %c.1) {
; CHECK-LABEL: 'load_with_pointer_phi_outside_loop'
; CHECK-NEXT: loop.header:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Unknown:
; CHECK-NEXT: %v8 = load double, double* %ptr, align 8 ->
; CHECK-NEXT: store double %mul16, double* %arrayidx, align 8
;
entry:
br i1 %c.0, label %if.then, label %if.else

if.then:
br label %loop.ph

if.else:
%ptr.select = select i1 %c.1, double* %C, double* %B
br label %loop.ph

loop.ph:
%ptr = phi double* [ %A, %if.then ], [ %ptr.select, %if.else ]
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop.header ]
%iv.next = add nuw nsw i64 %iv, 1
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
%v8 = load double, double* %ptr, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %arrayidx, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_outside_loop(double* %A, double* %B, double* %C, i1 %c.0, i1 %c.1) {
; CHECK-LABEL: 'store_with_pointer_phi_outside_loop'
; CHECK-NEXT: loop.header:
; CHECK-NEXT: Report: unsafe dependent memory operations in loop.
; CHECK-NEXT: Dependences:
; CHECK-NEXT: Unknown:
; CHECK-NEXT: %v8 = load double, double* %arrayidx, align 8 ->
; CHECK-NEXT: store double %mul16, double* %ptr, align 8
;
entry:
br i1 %c.0, label %if.then, label %if.else

if.then:
br label %loop.ph

if.else:
%ptr.select = select i1 %c.1, double* %C, double* %B
br label %loop.ph

loop.ph:
%ptr = phi double* [ %A, %if.then ], [ %ptr.select, %if.else ]
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop.header ]
%iv.next = add nuw nsw i64 %iv, 1
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %ptr, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}
169 changes: 169 additions & 0 deletions llvm/test/Transforms/LoopVectorize/vectorize-pointer-phis.ll
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@@ -0,0 +1,169 @@
; RUN: opt -loop-vectorize -force-vector-width=2 -S %s | FileCheck %s

%s1 = type { [32000 x double], [32000 x double], [32000 x double] }

define i32 @load_with_pointer_phi_no_runtime_checks(%s1* %data) {
; CHECK-LABEL: @load_with_pointer_phi_no_runtime_checks
; CHECK-NOT: vector.body
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds %s1, %s1 * %data, i64 0, i32 0, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 1, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 2, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %gep.2.sink, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %arrayidx, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_no_runtime_checks(%s1* %data) {
; CHECK-LABEL: @store_with_pointer_phi_no_runtime_checks
; CHECK-NOT: vector.body
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds %s1, %s1 * %data, i64 0, i32 0, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 1, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds %s1, %s1* %data, i64 0, i32 2, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %gep.2.sink, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_runtime_checks(double* %A, double* %B, double* %C) {
; CHECK-LABEL: @store_with_pointer_phi_runtime_checks
; CHECK-NOT: vector.body
;
entry:
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%iv.next = add nuw nsw i64 %iv, 1
%cmp5 = icmp ult i64 %iv, 15999
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
br i1 %cmp5, label %if.then, label %if.else

if.then: ; preds = %loop.header
%gep.1 = getelementptr inbounds double, double* %B, i64 %iv
br label %loop.latch

if.else: ; preds = %loop.header
%gep.2 = getelementptr inbounds double, double* %C, i64 %iv
br label %loop.latch

loop.latch: ; preds = %if.else, %if.then
%gep.2.sink = phi double* [ %gep.2, %if.else ], [ %gep.1, %if.then ]
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %gep.2.sink, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @load_with_pointer_phi_outside_loop(double* %A, double* %B, double* %C, i1 %c.0, i1 %c.1) {
; CHECK-LABEL: @load_with_pointer_phi_outside_loop
; CHECK-NOT: vector.body
;
entry:
br i1 %c.0, label %if.then, label %if.else

if.then:
br label %loop.ph

if.else:
%ptr.select = select i1 %c.1, double* %C, double* %B
br label %loop.ph

loop.ph:
%ptr = phi double* [ %A, %if.then ], [ %ptr.select, %if.else ]
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop.header ]
%iv.next = add nuw nsw i64 %iv, 1
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
%v8 = load double, double* %ptr, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %arrayidx, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

define i32 @store_with_pointer_phi_outside_loop(double* %A, double* %B, double* %C, i1 %c.0, i1 %c.1) {
; CHECK-LABEL: @store_with_pointer_phi_outside_loop
; CHECK-NOT: vector.body
;
entry:
br i1 %c.0, label %if.then, label %if.else

if.then:
br label %loop.ph

if.else:
%ptr.select = select i1 %c.1, double* %C, double* %B
br label %loop.ph

loop.ph:
%ptr = phi double* [ %A, %if.then ], [ %ptr.select, %if.else ]
br label %loop.header

loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop.header ]
%iv.next = add nuw nsw i64 %iv, 1
%arrayidx = getelementptr inbounds double, double* %A, i64 %iv
%v8 = load double, double* %arrayidx, align 8
%mul16 = fmul double 3.0, %v8
store double %mul16, double* %ptr, align 8
%exitcond.not = icmp eq i64 %iv.next, 32000
br i1 %exitcond.not, label %exit, label %loop.header

exit: ; preds = %loop.latch
ret i32 10
}

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