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

Extend the pattern-matching from rL354219 / rL354221.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354223 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/saturating-add-sub.ll b/test/Transforms/InstCombine/saturating-add-sub.ll
index 5ee5dcb9557669ef6551271cc59589a6db8c71a0..96848629438a46ff6a0f180cbd098b274d1c2a4c 100644 (file)
--- a/test/Transforms/InstCombine/saturating-add-sub.ll
+++ b/test/Transforms/InstCombine/saturating-add-sub.ll
@@ -653,8 +653,8 @@ define i32 @uadd_sat(i32 %x, i32 %y) {
   ret i32 %r
 }
 
-define i32 @uadd_sat_commute1(i32 %xp, i32 %y) {
-; CHECK-LABEL: @uadd_sat_commute1(
+define i32 @uadd_sat_commute_add(i32 %xp, i32 %y) {
+; CHECK-LABEL: @uadd_sat_commute_add(
 ; CHECK-NEXT:    [[X:%.*]] = urem i32 42, [[XP:%.*]]
 ; CHECK-NEXT:    [[A:%.*]] = add i32 [[X]], [[Y:%.*]]
 ; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i32 [[A]], [[Y]]
@@ -669,6 +669,42 @@ define i32 @uadd_sat_commute1(i32 %xp, i32 %y) {
   ret i32 %r
 }
 
+define i32 @uadd_sat_ugt(i32 %x, i32 %yp) {
+; CHECK-LABEL: @uadd_sat_ugt(
+; CHECK-NEXT:    [[Y:%.*]] = sdiv i32 [[YP:%.*]], 2442
+; CHECK-NEXT:    [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
+; CHECK-NEXT:    [[A:%.*]] = add i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[C:%.*]] = icmp ugt i32 [[Y]], [[NOTX]]
+; CHECK-NEXT:    [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
+; 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 ugt i32 %y, %notx
+  %r = select i1 %c, i32 -1, i32 %a
+  ret i32 %r
+}
+
+define i32 @uadd_sat_ugt_commute_add(i32 %xp, i32 %yp) {
+; CHECK-LABEL: @uadd_sat_ugt_commute_add(
+; CHECK-NEXT:    [[Y:%.*]] = sdiv i32 [[YP:%.*]], 2442
+; 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 [[Y]], [[NOTX]]
+; CHECK-NEXT:    [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %y = sdiv i32 %yp, 2442 ; thwart complexity-based-canonicalization
+  %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
+  ret i32 %r
+}
+
 define i32 @uadd_sat_constant(i32 %x) {
 ; CHECK-LABEL: @uadd_sat_constant(
 ; CHECK-NEXT:    [[A:%.*]] = add i32 [[X:%.*]], 42