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[EarlyCSE] Add tests for negated min/max/abs [NFC]

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Summary:
I'm planning to update the hashing logic to recognize their equivalence
in a subsequent change (D62644).

Reviewers: spatel

Reviewed By: spatel

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62918

llvm-svn: 362657
This commit is contained in:
Joseph Tremoulet 2019-06-05 21:30:10 +00:00
parent 3a93ac6600
commit fe7c3cb2a6
1 changed files with 102 additions and 0 deletions
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102
test/Transforms/EarlyCSE/commute.ll
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@ -107,6 +107,24 @@ define i1 @smin_swapped(i8 %a, i8 %b) {
ret i1 %r
}
; Min/max can also have an inverted predicate and select operands.
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i1 @smin_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @smin_inverted(
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK: ret i1
;
%cmp1 = icmp slt i8 %a, %b
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %b
%m2 = select i1 %cmp2, i8 %b, i8 %a
%r = icmp eq i8 %m1, %m2
ret i1 %r
}
define i8 @smax_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_commute(
; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
@ -137,6 +155,22 @@ define i8 @smax_swapped(i8 %a, i8 %b) {
ret i8 %r
}
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i1 @smax_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_inverted(
; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK: ret i1
;
%cmp1 = icmp sgt i8 %a, %b
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %b
%m2 = select i1 %cmp2, i8 %b, i8 %a
%r = icmp eq i8 %m1, %m2
ret i1 %r
}
define i8 @umin_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @umin_commute(
; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i8 [[A:%.*]], [[B:%.*]]
@ -169,6 +203,22 @@ define <2 x i8> @umin_swapped(<2 x i8> %a, <2 x i8> %b) {
ret <2 x i8> %r
}
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i1 @umin_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @umin_inverted(
; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK: ret i1
;
%cmp1 = icmp ult i8 %a, %b
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %b
%m2 = select i1 %cmp2, i8 %b, i8 %a
%r = icmp eq i8 %m1, %m2
ret i1 %r
}
define i8 @umax_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @umax_commute(
; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A:%.*]], [[B:%.*]]
@ -200,6 +250,22 @@ define i8 @umax_swapped(i8 %a, i8 %b) {
ret i8 %r
}
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i1 @umax_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @umax_inverted(
; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK: ret i1
;
%cmp1 = icmp ugt i8 %a, %b
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %b
%m2 = select i1 %cmp2, i8 %b, i8 %a
%r = icmp eq i8 %m1, %m2
ret i1 %r
}
; Min/max may exist with non-canonical operands. Value tracking can match those.
define i8 @smax_nsw(i8 %a, i8 %b) {
@ -236,6 +302,24 @@ define i8 @abs_swapped(i8 %a) {
ret i8 %r
}
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i8 @abs_inverted(i8 %a) {
; CHECK-LABEL: @abs_inverted(
; CHECK-NEXT: [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i8 [[A]], 0
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK: ret i8
;
%neg = sub i8 0, %a
%cmp1 = icmp sgt i8 %a, 0
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %neg
%m2 = select i1 %cmp2, i8 %neg, i8 %a
%r = or i8 %m2, %m1
ret i8 %r
}
define i8 @nabs_swapped(i8 %a) {
; CHECK-LABEL: @nabs_swapped(
; CHECK-NEXT: [[NEG:%.*]] = sub i8 0, [[A:%.*]]
@ -253,6 +337,24 @@ define i8 @nabs_swapped(i8 %a) {
ret i8 %r
}
; TODO: Ensure we always recognize this (currently depends on hash collision)
define i8 @nabs_inverted(i8 %a) {
; CHECK-LABEL: @nabs_inverted(
; CHECK-NEXT: [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT: [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT: [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK: ret i8
;
%neg = sub i8 0, %a
%cmp1 = icmp slt i8 %a, 0
%cmp2 = xor i1 %cmp1, -1
%m1 = select i1 %cmp1, i8 %a, i8 %neg
%m2 = select i1 %cmp2, i8 %neg, i8 %a
%r = xor i8 %m2, %m1
ret i8 %r
}
; These two tests make sure we still consider it a match when the RHS of the
; compares are different.
define i8 @abs_different_constants(i8 %a) {