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[InstCombine] add more tests for saturated add; NFC
llvm-svn: 354886
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‎llvm/test/Transforms/InstCombine/saturating-add-sub.ll

Lines changed: 134 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -931,6 +931,140 @@ define i32 @uadd_sat_not_commute_select_ugt_commute_add(i32 %x, i32 %y) {
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ret i32 %r
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}
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; The add may include a 'not' op rather than the cmp.
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define i32 @uadd_sat_not(i32 %x, i32 %y) {
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; CHECK-LABEL: @uadd_sat_not(
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
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; CHECK-NEXT: [[A:%.*]] = add i32 [[NOTX]], [[Y:%.*]]
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; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[X]], [[Y]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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%notx = xor i32 %x, -1
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%a = add i32 %notx, %y
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%c = icmp ult i32 %x, %y
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%r = select i1 %c, i32 -1, i32 %a
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ret i32 %r
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}
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define i32 @uadd_sat_not_commute_add(i32 %xp, i32 %yp) {
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; CHECK-LABEL: @uadd_sat_not_commute_add(
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; CHECK-NEXT: [[X:%.*]] = srem i32 42, [[XP:%.*]]
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; CHECK-NEXT: [[Y:%.*]] = urem i32 42, [[YP:%.*]]
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X]], -1
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; CHECK-NEXT: [[A:%.*]] = add nsw i32 [[Y]], [[NOTX]]
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; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[X]], [[Y]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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%x = srem i32 42, %xp ; thwart complexity-based-canonicalization
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%y = urem i32 42, %yp ; thwart complexity-based-canonicalization
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%notx = xor i32 %x, -1
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%a = add i32 %y, %notx
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%c = icmp ult i32 %x, %y
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%r = select i1 %c, i32 -1, i32 %a
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ret i32 %r
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}
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define i32 @uadd_sat_not_ugt(i32 %x, i32 %y) {
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; CHECK-LABEL: @uadd_sat_not_ugt(
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
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; CHECK-NEXT: [[A:%.*]] = add i32 [[NOTX]], [[Y:%.*]]
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; CHECK-NEXT: [[C:%.*]] = icmp ugt i32 [[Y]], [[X]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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%notx = xor i32 %x, -1
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%a = add i32 %notx, %y
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%c = icmp ugt i32 %y, %x
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%r = select i1 %c, i32 -1, i32 %a
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ret i32 %r
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}
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define <2 x i32> @uadd_sat_not_ugt_commute_add(<2 x i32> %x, <2 x i32> %yp) {
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; CHECK-LABEL: @uadd_sat_not_ugt_commute_add(
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; CHECK-NEXT: [[Y:%.*]] = sdiv <2 x i32> [[YP:%.*]], <i32 2442, i32 4242>
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; CHECK-NEXT: [[NOTX:%.*]] = xor <2 x i32> [[X:%.*]], <i32 -1, i32 -1>
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; CHECK-NEXT: [[A:%.*]] = add <2 x i32> [[Y]], [[NOTX]]
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; CHECK-NEXT: [[C:%.*]] = icmp ugt <2 x i32> [[Y]], [[X]]
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; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[C]], <2 x i32> <i32 -1, i32 -1>, <2 x i32> [[A]]
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; CHECK-NEXT: ret <2 x i32> [[R]]
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;
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%y = sdiv <2 x i32> %yp, <i32 2442, i32 4242> ; thwart complexity-based-canonicalization
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%notx = xor <2 x i32> %x, <i32 -1, i32 -1>
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%a = add <2 x i32> %y, %notx
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%c = icmp ugt <2 x i32> %y, %x
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%r = select <2 x i1> %c, <2 x i32> <i32 -1, i32 -1>, <2 x i32> %a
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ret <2 x i32> %r
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}
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define i32 @uadd_sat_not_commute_select(i32 %x, i32 %y) {
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; CHECK-LABEL: @uadd_sat_not_commute_select(
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
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; CHECK-NEXT: [[A:%.*]] = add i32 [[NOTX]], [[Y:%.*]]
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; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[Y]], [[X]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
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; CHECK-NEXT: ret i32 [[R]]
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;
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%notx = xor i32 %x, -1
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%a = add i32 %notx, %y
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%c = icmp ult i32 %y, %x
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%r = select i1 %c, i32 %a, i32 -1
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ret i32 %r
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}
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define i32 @uadd_sat_not_commute_select_commute_add(i32 %x, i32 %yp) {
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; CHECK-LABEL: @uadd_sat_not_commute_select_commute_add(
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; CHECK-NEXT: [[Y:%.*]] = sdiv i32 42, [[YP:%.*]]
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
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; CHECK-NEXT: [[A:%.*]] = add i32 [[Y]], [[NOTX]]
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; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[Y]], [[X]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
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; CHECK-NEXT: ret i32 [[R]]
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;
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%y = sdiv i32 42, %yp ; thwart complexity-based-canonicalization
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%notx = xor i32 %x, -1
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%a = add i32 %y, %notx
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%c = icmp ult i32 %y, %x
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%r = select i1 %c, i32 %a, i32 -1
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ret i32 %r
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}
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define <2 x i32> @uadd_sat_not_commute_select_ugt(<2 x i32> %xp, <2 x i32> %yp) {
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; CHECK-LABEL: @uadd_sat_not_commute_select_ugt(
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; CHECK-NEXT: [[X:%.*]] = urem <2 x i32> <i32 42, i32 -42>, [[XP:%.*]]
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; CHECK-NEXT: [[Y:%.*]] = srem <2 x i32> <i32 12, i32 412>, [[YP:%.*]]
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; CHECK-NEXT: [[NOTX:%.*]] = xor <2 x i32> [[X]], <i32 -1, i32 -1>
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; CHECK-NEXT: [[A:%.*]] = add <2 x i32> [[Y]], [[NOTX]]
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; CHECK-NEXT: [[C:%.*]] = icmp ugt <2 x i32> [[X]], [[Y]]
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; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[C]], <2 x i32> [[A]], <2 x i32> <i32 -1, i32 -1>
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; CHECK-NEXT: ret <2 x i32> [[R]]
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;
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%x = urem <2 x i32> <i32 42, i32 -42>, %xp ; thwart complexity-based-canonicalization
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%y = srem <2 x i32> <i32 12, i32 412>, %yp ; thwart complexity-based-canonicalization
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%notx = xor <2 x i32> %x, <i32 -1, i32 -1>
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%a = add <2 x i32> %y, %notx
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%c = icmp ugt <2 x i32> %x, %y
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%r = select <2 x i1> %c, <2 x i32> %a, <2 x i32> <i32 -1, i32 -1>
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ret <2 x i32> %r
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}
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define i32 @uadd_sat_not_commute_select_ugt_commute_add(i32 %x, i32 %y) {
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; CHECK-LABEL: @uadd_sat_not_commute_select_ugt_commute_add(
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
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; CHECK-NEXT: [[A:%.*]] = add i32 [[NOTX]], [[Y:%.*]]
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; CHECK-NEXT: [[C:%.*]] = icmp ugt i32 [[X]], [[Y]]
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; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
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; CHECK-NEXT: ret i32 [[R]]
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;
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%notx = xor i32 %x, -1
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%a = add i32 %notx, %y
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%c = icmp ugt i32 %x, %y
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%r = select i1 %c, i32 %a, i32 -1
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ret i32 %r
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}
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define i32 @uadd_sat_constant(i32 %x) {
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; CHECK-LABEL: @uadd_sat_constant(
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; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], 42

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