[tests] precommit tests for D148986

[nikic]

LGTM, but I'd suggest merging these tests into the existing select_or_and.ll file.

[Allen]

merge the test into select_or_and.ll file

llvm/test/Transforms/InstCombine/select-ctlz-to-cttz.ll

;
   %and = and i32 %sub, %a
   %lz = tail call i32 @llvm.ctlz.i32(i32 %and, i1 true)
   %tobool = icmp eq i32 %a, 0
   %sub1 = xor i32 %lz, 31
   %cond = select i1 %tobool, i32 %lz, i32 %sub1
   ret i32 %cond
 }
 
+; TODO: https://alive2.llvm.org/ce/z/X6QjcB
 define i64 @select_clz_to_ctz_i64_wrong_xor(i64 %a) {
 ; CHECK-LABEL: @select_clz_to_ctz_i64_wrong_xor(
 ; CHECK-NEXT:    [[SUB:%.*]] = sub i64 0, [[A:%.*]]
 ; CHECK-NEXT:    [[AND:%.*]] = and i64 [[SUB]], [[A]]
 ; CHECK-NEXT:    [[LZ:%.*]] = tail call i64 @llvm.ctlz.i64(i64 [[AND]], i1 true), !range [[RNG1]]
 ; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i64 [[A]], 0
 ; CHECK-NEXT:    [[SUB11:%.*]] = or i64 [[LZ]], 64
 ; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i64 [[LZ]], i64 [[SUB11]]

llvm/test/Transforms/InstSimplify/select_or_and.ll

 ; CHECK-NEXT:    [[RET:%.*]] = select i1 [[CMP]], i32 [[Y]], i32 [[AND]]
 ; CHECK-NEXT:    ret i32 [[RET]]
 ;
   %and = and i32 %y, %x
   %cmp = icmp ne i32 %and, 123
   %ret = select i1 %cmp, i32 %y, i32 %and
   ret i32 %ret
 }
+
+; TODO: https://alive2.llvm.org/ce/z/1ILbih
+define i32 @select_icmp_and_eq(i32 %a, i32 %b) {
+; CHECK-LABEL: @select_icmp_and_eq(
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[AND]], -1
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i32 [[A]], i32 -1
+; CHECK-NEXT:    ret i32 [[COND]]
+;
+  %and = and i32 %a, %b
+  %tobool = icmp eq i32 %and, -1
+  %cond = select i1 %tobool, i32 %a, i32 -1
+  ret i32 %cond
+}
+
+; https://alive2.llvm.org/ce/z/hSyCuR
+define i32 @select_icmp_or_eq(i32 %a, i32 %b) {
+; CHECK-LABEL: @select_icmp_or_eq(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[OR]], 0
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i32 [[A]], i32 0
+; CHECK-NEXT:    ret i32 [[COND]]
+;
+  %or = or i32 %a, %b
+  %tobool = icmp eq i32 %or, 0
+  %cond = select i1 %tobool, i32 %a, i32 0
+  ret i32 %cond
+}
+
+define i32 @select_icmp_or_eq_commuted(i32 %a, i32 %b) {
+; CHECK-LABEL: @select_icmp_or_eq_commuted(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[OR]], 0
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i32 [[B]], i32 0
+; CHECK-NEXT:    ret i32 [[COND]]
+;
+  %or = or i32 %a, %b
+  %tobool = icmp eq i32 %or, 0
+  %cond = select i1 %tobool, i32 %b, i32 0
+  ret i32 %cond
+}
+
+; https://alive2.llvm.org/ce/z/S_pQek
+define <2 x i16> @select_icmp_or_eq_vec(<2 x i16> %a, <2 x i16> %b) {
+; CHECK-LABEL: @select_icmp_or_eq_vec(
+; CHECK-NEXT:    [[OR:%.*]] = or <2 x i16> [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq <2 x i16> [[OR]], zeroinitializer
+; CHECK-NEXT:    [[COND:%.*]] = select <2 x i1> [[TOBOOL]], <2 x i16> [[A]], <2 x i16> zeroinitializer
+; CHECK-NEXT:    ret <2 x i16> [[COND]]
+;
+  %or = or <2 x i16> %a, %b
+  %tobool = icmp eq <2 x i16> %or, <i16 0, i16 0>
+  %cond = select <2 x i1> %tobool, <2 x i16> %a, <2 x i16> zeroinitializer
+  ret <2 x i16> %cond
+}
+
+; The ne will be normalized to eq as above select_icmp_or_eq in instcombine
+define i32 @select_icmp_or_ne(i32 %a, i32 %b) {
+; CHECK-LABEL: @select_icmp_or_ne(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp ne i32 [[OR]], 0
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i32 0, i32 [[A]]
+; CHECK-NEXT:    ret i32 [[COND]]
+;
+  %or = or i32 %a, %b
+  %tobool = icmp ne i32 %or, 0
+  %cond = select i1 %tobool, i32 0, i32 %a
+  ret i32 %cond
+}
+
+; Negative test: Incorrect const value for icmp
+define i32 @select_icmp_or_eq_incorrect_const(i32 %a, i32 %b) {
+; CHECK-LABEL: @select_icmp_or_eq_incorrect_const(
+; CHECK-NEXT:    [[OR:%.*]] = or i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[OR]], -1
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[TOBOOL]], i32 [[A]], i32 0
+; CHECK-NEXT:    ret i32 [[COND]]
+;
+  %or = or i32 %a, %b
+  %tobool = icmp eq i32 %or, -1
+  %cond = select i1 %tobool, i32 %a, i32 0
+  ret i32 %cond
+}