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[SLP] add test for reduction miscompile; NFC

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See D70148 for discussion.
This commit is contained in:
Sanjay Patel 2019-11-19 10:24:32 -05:00
parent 7935cf1c34
commit 7da0f4eb10
1 changed files with 30 additions and 0 deletions
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30
test/Transforms/SLPVectorizer/X86/reduction.ll
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@ -123,3 +123,33 @@ define i32 @horiz_max_multiple_uses([32 x i32]* %x, i32* %p) {
store i32 %three_or_four, i32* %p, align 8
ret i32 %t17
}
; FIXME: This is a miscompile (see the undef operand) and/or test for invalid IR.
define i1 @bad_insertpoint_rdx([8 x i32]* %p) #0 {
; CHECK-LABEL: @bad_insertpoint_rdx(
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr inbounds [8 x i32], [8 x i32]* [[P:%.*]], i64 0, i64 0
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i32* [[ARRAYIDX22]] to <2 x i32>*
; CHECK-NEXT: [[TMP2:%.*]] = load <2 x i32>, <2 x i32>* [[TMP1]], align 16
; CHECK-NEXT: [[SPEC_STORE_SELECT87:%.*]] = zext i1 undef to i32
; CHECK-NEXT: [[RDX_SHUF:%.*]] = shufflevector <2 x i32> [[TMP2]], <2 x i32> undef, <2 x i32> <i32 1, i32 undef>
; CHECK-NEXT: [[RDX_MINMAX_CMP:%.*]] = icmp sgt <2 x i32> [[TMP2]], [[RDX_SHUF]]
; CHECK-NEXT: [[RDX_MINMAX_SELECT:%.*]] = select <2 x i1> [[RDX_MINMAX_CMP]], <2 x i32> [[TMP2]], <2 x i32> [[RDX_SHUF]]
; CHECK-NEXT: [[TMP3:%.*]] = extractelement <2 x i32> [[RDX_MINMAX_SELECT]], i32 0
; CHECK-NEXT: [[TMP4:%.*]] = icmp sgt i32 [[TMP3]], 0
; CHECK-NEXT: [[OP_EXTRA:%.*]] = select i1 [[TMP4]], i32 [[TMP3]], i32 0
; CHECK-NEXT: [[CMP23_2:%.*]] = icmp sgt i32 [[SPEC_STORE_SELECT87]], [[OP_EXTRA]]
; CHECK-NEXT: ret i1 [[CMP23_2]]
;
%arrayidx22 = getelementptr inbounds [8 x i32], [8 x i32]* %p, i64 0, i64 0
%t0 = load i32, i32* %arrayidx22, align 16
%cmp23 = icmp sgt i32 %t0, 0
%spec.select = select i1 %cmp23, i32 %t0, i32 0
%arrayidx22.1 = getelementptr inbounds [8 x i32], [8 x i32]* %p, i64 0, i64 1
%t1 = load i32, i32* %arrayidx22.1, align 4
%cmp23.1 = icmp sgt i32 %t1, %spec.select
%spec.store.select87 = zext i1 %cmp23.1 to i32
%spec.select88 = select i1 %cmp23.1, i32 %t1, i32 %spec.select
%cmp23.2 = icmp sgt i32 %spec.store.select87, %spec.select88
ret i1 %cmp23.2
}