30be665e82
This is the last step in getting constant pattern matchers to allow undef elements in constant vectors. I'm adding a dedicated m_ZeroInt() function and building m_Zero() from that. In most cases, calling code can be updated to use m_ZeroInt() directly when there's no need to match pointers, but I'm leaving that efficiency optimization as a follow-up step because it's not always clear when that's ok. There are just enough icmp folds in InstSimplify that can be used for integer or pointer types, that we probably still want a generic m_Zero() for those cases. Otherwise, we could eliminate it (and possibly add a m_NullPtr() as an alias for isa<ConstantPointerNull>()). We're conservatively returning a full zero vector (zeroinitializer) in InstSimplify/InstCombine on some of these folds (see diffs in InstSimplify), but I'm not sure if that's actually necessary in all cases. We may be able to propagate an undef lane instead. One test where this happens is marked with 'TODO'. llvm-svn: 330550
102 lines
3.7 KiB
LLVM
102 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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@g = external global i32
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define i1 @smin(i32 %other) {
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; CHECK-LABEL: @smin(
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt i32 [[OTHER:%.*]], 0
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; CHECK-NEXT: ret i1 [[TEST]]
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;
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%positive = load i32, i32* @g, !range !{i32 1, i32 2048}
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%cmp = icmp slt i32 %positive, %other
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%sel = select i1 %cmp, i32 %positive, i32 %other
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%test = icmp sgt i32 %sel, 0
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ret i1 %test
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}
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; Range metadata doesn't work for vectors, so find another way to trigger isKnownPositive().
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define <2 x i1> @smin_vec(<2 x i32> %x, <2 x i32> %other) {
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; CHECK-LABEL: @smin_vec(
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt <2 x i32> [[OTHER:%.*]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[TEST]]
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;
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%notneg = and <2 x i32> %x, <i32 7, i32 7>
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%positive = or <2 x i32> %notneg, <i32 1, i32 1>
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%cmp = icmp slt <2 x i32> %positive, %other
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%sel = select <2 x i1> %cmp, <2 x i32> %positive, <2 x i32> %other
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%test = icmp sgt <2 x i32> %sel, zeroinitializer
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ret <2 x i1> %test
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}
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define i1 @smin_commute(i32 %other) {
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; CHECK-LABEL: @smin_commute(
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt i32 [[OTHER:%.*]], 0
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; CHECK-NEXT: ret i1 [[TEST]]
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;
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%positive = load i32, i32* @g, !range !{i32 1, i32 2048}
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%cmp = icmp slt i32 %other, %positive
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%sel = select i1 %cmp, i32 %other, i32 %positive
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%test = icmp sgt i32 %sel, 0
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ret i1 %test
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}
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define <2 x i1> @smin_commute_vec(<2 x i32> %x, <2 x i32> %other) {
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; CHECK-LABEL: @smin_commute_vec(
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt <2 x i32> [[OTHER:%.*]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[TEST]]
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;
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%notneg = and <2 x i32> %x, <i32 7, i32 7>
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%positive = or <2 x i32> %notneg, <i32 1, i32 1>
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%cmp = icmp slt <2 x i32> %other, %positive
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%sel = select <2 x i1> %cmp, <2 x i32> %other, <2 x i32> %positive
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%test = icmp sgt <2 x i32> %sel, zeroinitializer
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ret <2 x i1> %test
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}
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define <2 x i1> @smin_commute_vec_undef_elts(<2 x i32> %x, <2 x i32> %other) {
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; CHECK-LABEL: @smin_commute_vec_undef_elts(
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt <2 x i32> [[OTHER:%.*]], <i32 0, i32 undef>
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; CHECK-NEXT: ret <2 x i1> [[TEST]]
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;
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%notneg = and <2 x i32> %x, <i32 7, i32 7>
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%positive = or <2 x i32> %notneg, <i32 1, i32 1>
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%cmp = icmp slt <2 x i32> %other, %positive
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%sel = select <2 x i1> %cmp, <2 x i32> %other, <2 x i32> %positive
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%test = icmp sgt <2 x i32> %sel, <i32 0, i32 undef>
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ret <2 x i1> %test
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}
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; %positive might be zero
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define i1 @maybe_not_positive(i32 %other) {
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; CHECK-LABEL: @maybe_not_positive(
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; CHECK-NEXT: [[POSITIVE:%.*]] = load i32, i32* @g, align 4, !range !0
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[POSITIVE]], [[OTHER:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i32 [[POSITIVE]], i32 [[OTHER]]
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt i32 [[SEL]], 0
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; CHECK-NEXT: ret i1 [[TEST]]
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;
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%positive = load i32, i32* @g, !range !{i32 0, i32 2048}
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%cmp = icmp slt i32 %positive, %other
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%sel = select i1 %cmp, i32 %positive, i32 %other
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%test = icmp sgt i32 %sel, 0
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ret i1 %test
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}
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define <2 x i1> @maybe_not_positive_vec(<2 x i32> %x, <2 x i32> %other) {
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; CHECK-LABEL: @maybe_not_positive_vec(
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; CHECK-NEXT: [[NOTNEG:%.*]] = and <2 x i32> [[X:%.*]], <i32 7, i32 7>
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i32> [[NOTNEG]], [[OTHER:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select <2 x i1> [[CMP]], <2 x i32> [[NOTNEG]], <2 x i32> [[OTHER]]
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; CHECK-NEXT: [[TEST:%.*]] = icmp sgt <2 x i32> [[SEL]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[TEST]]
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;
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%notneg = and <2 x i32> %x, <i32 7, i32 7>
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%cmp = icmp slt <2 x i32> %notneg, %other
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%sel = select <2 x i1> %cmp, <2 x i32> %notneg, <2 x i32> %other
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%test = icmp sgt <2 x i32> %sel, zeroinitializer
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ret <2 x i1> %test
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}
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