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[InstCombine] add even more tests for unsigned saturated add; NFC 

The pattern-matching from rL354221 / rL354224 doesn't cover
these, so we're up to 8 different commuted possibilities.

There may still be 1 more variant of this pattern.

llvm-svn: 354236
This commit is contained in:
Sanjay Patel 2019-02-17 20:01:59 +00:00
parent 33be563229
commit 92b5b195db
1 changed files with 76 additions and 8 deletions
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84
llvm/test/Transforms/InstCombine/saturating-add-sub.ll
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@ -685,21 +685,89 @@ define i32 @uadd_sat_ugt(i32 %x, i32 %yp) {
ret i32 %r
}
define i32 @uadd_sat_ugt_commute_add(i32 %xp, i32 %yp) {
define <2 x i32> @uadd_sat_ugt_commute_add(<2 x i32> %xp, <2 x i32> %yp) {
; CHECK-LABEL: @uadd_sat_ugt_commute_add(
; CHECK-NEXT: [[Y:%.*]] = sdiv <2 x i32> [[YP:%.*]], <i32 2442, i32 4242>
; CHECK-NEXT: [[X:%.*]] = srem <2 x i32> <i32 42, i32 43>, [[XP:%.*]]
; CHECK-NEXT: [[A:%.*]] = add <2 x i32> [[X]], [[Y]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i32> [[A]], [[Y]]
; CHECK-NEXT: [[TMP2:%.*]] = select <2 x i1> [[TMP1]], <2 x i32> <i32 -1, i32 -1>, <2 x i32> [[A]]
; CHECK-NEXT: ret <2 x i32> [[TMP2]]
;
%y = sdiv <2 x i32> %yp, <i32 2442, i32 4242> ; thwart complexity-based-canonicalization
%x = srem <2 x i32> <i32 42, i32 43>, %xp ; thwart complexity-based-canonicalization
%notx = xor <2 x i32> %x, <i32 -1, i32 -1>
%a = add <2 x i32> %x, %y
%c = icmp ugt <2 x i32> %y, %notx
%r = select <2 x i1> %c, <2 x i32> <i32 -1, i32 -1>, <2 x i32> %a
ret <2 x i32> %r
}
define i32 @uadd_sat_commute_select(i32 %x, i32 %yp) {
; CHECK-LABEL: @uadd_sat_commute_select(
; CHECK-NEXT: [[Y:%.*]] = sdiv i32 [[YP:%.*]], 2442
; CHECK-NEXT: [[X:%.*]] = srem i32 42, [[XP:%.*]]
; CHECK-NEXT: [[A:%.*]] = add i32 [[X]], [[Y]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 [[A]], [[Y]]
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[A]]
; CHECK-NEXT: ret i32 [[TMP2]]
; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: [[A:%.*]] = add i32 [[Y]], [[X]]
; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[Y]], [[NOTX]]
; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
; CHECK-NEXT: ret i32 [[R]]
;
%y = sdiv i32 %yp, 2442 ; thwart complexity-based-canonicalization
%notx = xor i32 %x, -1
%a = add i32 %y, %x
%c = icmp ult i32 %y, %notx
%r = select i1 %c, i32 %a, i32 -1
ret i32 %r
}
define i32 @uadd_sat_commute_select_commute_add(i32 %xp, i32 %yp) {
; CHECK-LABEL: @uadd_sat_commute_select_commute_add(
; CHECK-NEXT: [[X:%.*]] = urem i32 42, [[XP:%.*]]
; CHECK-NEXT: [[Y:%.*]] = sdiv i32 [[YP:%.*]], 2442
; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X]], -1
; CHECK-NEXT: [[A:%.*]] = add nsw i32 [[X]], [[Y]]
; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[Y]], [[NOTX]]
; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
; CHECK-NEXT: ret i32 [[R]]
;
%x = urem i32 42, %xp ; thwart complexity-based-canonicalization
%y = sdiv i32 %yp, 2442 ; thwart complexity-based-canonicalization
%notx = xor i32 %x, -1
%a = add i32 %x, %y
%c = icmp ult i32 %y, %notx
%r = select i1 %c, i32 %a, i32 -1
ret i32 %r
}
define <2 x i32> @uadd_sat_commute_select_ugt(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @uadd_sat_commute_select_ugt(
; CHECK-NEXT: [[NOTX:%.*]] = xor <2 x i32> [[X:%.*]], <i32 -1, i32 -1>
; CHECK-NEXT: [[A:%.*]] = add <2 x i32> [[Y:%.*]], [[X]]
; CHECK-NEXT: [[C:%.*]] = icmp ugt <2 x i32> [[NOTX]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[C]], <2 x i32> [[A]], <2 x i32> <i32 -1, i32 -1>
; CHECK-NEXT: ret <2 x i32> [[R]]
;
%notx = xor <2 x i32> %x, <i32 -1, i32 -1>
%a = add <2 x i32> %y, %x
%c = icmp ugt <2 x i32> %notx, %y
%r = select <2 x i1> %c, <2 x i32> %a, <2 x i32> <i32 -1, i32 -1>
ret <2 x i32> %r
}
define i32 @uadd_sat_commute_select_ugt_commute_add(i32 %xp, i32 %y) {
; CHECK-LABEL: @uadd_sat_commute_select_ugt_commute_add(
; CHECK-NEXT: [[X:%.*]] = srem i32 42, [[XP:%.*]]
; CHECK-NEXT: [[NOTX:%.*]] = xor i32 [[X]], -1
; CHECK-NEXT: [[A:%.*]] = add i32 [[X]], [[Y:%.*]]
; CHECK-NEXT: [[C:%.*]] = icmp ugt i32 [[NOTX]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1
; CHECK-NEXT: ret i32 [[R]]
;
%x = srem i32 42, %xp ; thwart complexity-based-canonicalization
%notx = xor i32 %x, -1
%a = add i32 %x, %y
%c = icmp ugt i32 %y, %notx
%r = select i1 %c, i32 -1, i32 %a
%c = icmp ugt i32 %notx, %y
%r = select i1 %c, i32 %a, i32 -1
ret i32 %r
}