[InstCombine] Add tests (cmp eq/ne (umax/uadd.sat X, Y), 0); NFC

Differential Revision: https://reviews.llvm.org/D149424

llvm/test/Transforms/InstCombine/cmp-intrinsic.ll

@@ -7,6 +7,8 @@ declare <2 x i64> @llvm.bswap.v2i64(<2 x i64>)
 declare i32 @llvm.cttz.i32(i32, i1)
 declare i33 @llvm.cttz.i33(i33, i1)
 declare i32 @llvm.ctlz.i32(i32, i1)
+declare i8 @llvm.umax.i8(i8, i8)
+declare i8 @llvm.uadd.sat.i8(i8, i8)
 declare i33 @llvm.ctlz.i33(i33, i1)
 declare i8 @llvm.ctpop.i8(i8)
 declare i11 @llvm.ctpop.i11(i11)
@@ -16,6 +18,7 @@ declare <2 x i32> @llvm.ctpop.v2i32(<2 x i32>)
 declare i8 @llvm.bitreverse.i8(i8)
 declare <2 x i8> @llvm.bitreverse.v2i8(<2 x i8>)
 declare void @use6(i6)
+declare void @use8(i8)
 
 define i1 @bswap_eq_i16(i16 %x) {
 ; CHECK-LABEL: @bswap_eq_i16(
@@ -786,7 +789,6 @@ define i1 @bitreverse_ult_22_fail_not_equality_pred(i8 %x) {
   ret i1 %z
 }
 
-
 define <2 x i1> @bitreverse_vec_eq_2_2(<2 x i8> %x) {
 ; CHECK-LABEL: @bitreverse_vec_eq_2_2(
 ; CHECK-NEXT:    [[Z:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 64, i8 64>
@@ -807,3 +809,75 @@ define <2 x i1> @bitreverse_vec_eq_1_2_todo_no_splat(<2 x i8> %x) {
   %z = icmp eq <2 x i8> %y, <i8 1, i8 2>
   ret <2 x i1> %z
 }
+
+define i1 @umax_eq_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @umax_eq_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.umax.i8(i8 %x, i8 %y)
+  %r = icmp eq i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @umax_eq_1_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @umax_eq_1_fail(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[M]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.umax.i8(i8 %x, i8 %y)
+  %r = icmp eq i8 %m, 1
+  ret i1 %r
+}
+
+define i1 @umax_sle_zero_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @umax_sle_zero_fail(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[M]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.umax.i8(i8 %x, i8 %y)
+  %r = icmp sle i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @umax_ne_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @umax_ne_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp ne i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.umax.i8(i8 %x, i8 %y)
+  %r = icmp ne i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @umax_ne_zero_fail_multiuse(i8 %x, i8 %y) {
+; CHECK-LABEL: @umax_ne_zero_fail_multiuse(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    call void @use8(i8 [[M]])
+; CHECK-NEXT:    [[R:%.*]] = icmp ne i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.umax.i8(i8 %x, i8 %y)
+  call void @use8(i8 %m)
+  %r = icmp ne i8 %m, 0
+  ret i1 %r
+}
+
+
+define i1 @uadd_sat_ne_zero_fail_multiuse(i8 %x, i8 %y) {
+; CHECK-LABEL: @uadd_sat_ne_zero_fail_multiuse(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    call void @use8(i8 [[M]])
+; CHECK-NEXT:    [[TMP1:%.*]] = or i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[R:%.*]] = icmp ne i8 [[TMP1]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.uadd.sat.i8(i8 %x, i8 %y)
+  call void @use8(i8 %m)
+  %r = icmp ne i8 %m, 0
+  ret i1 %r
+}