[InstCombine] Add tests for folding (icmp pred (trunc nuw/nsw X), C); NFC

Author: goldsteinn

llvm/test/Transforms/InstCombine/icmp-trunc.ll

@@ -555,3 +555,167 @@ define i1 @shl1_trunc_sgt4(i32 %a) {
   %r = icmp sgt i16 %t, 4
   ret i1 %r
 }
+
+define i1 @eq_nuw(i32 %x) {
+; DL64-LABEL: @eq_nuw(
+; DL64-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 255
+; DL64-NEXT:    [[R:%.*]] = icmp eq i32 [[TMP1]], 123
+; DL64-NEXT:    ret i1 [[R]]
+;
+; DL8-LABEL: @eq_nuw(
+; DL8-NEXT:    [[T:%.*]] = trunc nuw i32 [[X:%.*]] to i8
+; DL8-NEXT:    [[R:%.*]] = icmp eq i8 [[T]], 123
+; DL8-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i32 %x to i8
+  %r = icmp eq i8 %t, 123
+  ret i1 %r
+}
+
+define i1 @ult_nuw(i32 %x) {
+; CHECK-LABEL: @ult_nuw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nuw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], 45
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i32 %x to i8
+  %r = icmp ult i8 %t, 45
+  ret i1 %r
+}
+
+define i1 @ule_nuw(i32 %x) {
+; CHECK-LABEL: @ule_nuw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nuw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T]], 46
+; CHECK-NEXT:    call void @use(i8 [[T]])
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i32 %x to i8
+  %r = icmp ule i8 %t, 45
+  call void @use(i8 %t)
+  ret i1 %r
+}
+
+define i1 @ugt_nuw(i32 %x) {
+; CHECK-LABEL: @ugt_nuw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nuw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], 12
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i32 %x to i8
+  %r = icmp ugt i8 %t, 12
+  ret i1 %r
+}
+
+define i1 @uge_nuw(i48 %x) {
+; CHECK-LABEL: @uge_nuw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nuw i48 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T]], 98
+; CHECK-NEXT:    call void @use(i8 [[T]])
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i48 %x to i8
+  %r = icmp uge i8 %t, 99
+  call void @use(i8 %t)
+  ret i1 %r
+}
+
+define i1 @sgt_nuw_fail(i32 %x) {
+; CHECK-LABEL: @sgt_nuw_fail(
+; CHECK-NEXT:    [[T:%.*]] = trunc nuw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[T]], 12
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nuw i32 %x to i8
+  %r = icmp sgt i8 %t, 12
+  ret i1 %r
+}
+
+define i1 @ne_nsw(i32 %x) {
+; DL64-LABEL: @ne_nsw(
+; DL64-NEXT:    [[TMP1:%.*]] = and i32 [[X:%.*]], 255
+; DL64-NEXT:    [[R:%.*]] = icmp ne i32 [[TMP1]], 123
+; DL64-NEXT:    ret i1 [[R]]
+;
+; DL8-LABEL: @ne_nsw(
+; DL8-NEXT:    [[T:%.*]] = trunc nsw i32 [[X:%.*]] to i8
+; DL8-NEXT:    [[R:%.*]] = icmp ne i8 [[T]], 123
+; DL8-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nsw i32 %x to i8
+  %r = icmp ne i8 %t, 123
+  ret i1 %r
+}
+
+define i1 @slt_nsw(i32 %x) {
+; CHECK-LABEL: @slt_nsw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[T]], 45
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nsw i32 %x to i8
+  %r = icmp slt i8 %t, 45
+  ret i1 %r
+}
+
+define i1 @sle_nsw(i32 %x) {
+; CHECK-LABEL: @sle_nsw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[T]], 46
+; CHECK-NEXT:    call void @use(i8 [[T]])
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nsw i32 %x to i8
+  %r = icmp sle i8 %t, 45
+  call void @use(i8 %t)
+  ret i1 %r
+}
+
+define i1 @sgt_nsw(i32 %x) {
+; CHECK-LABEL: @sgt_nsw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw i32 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[T]], 12
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nsw i32 %x to i8
+  %r = icmp sgt i8 %t, 12
+  ret i1 %r
+}
+
+define i1 @sge_nsw(i48 %x) {
+; CHECK-LABEL: @sge_nsw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw i48 [[X:%.*]] to i8
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[T]], 98
+; CHECK-NEXT:    call void @use(i8 [[T]])
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %t = trunc nsw i48 %x to i8
+  %r = icmp sge i8 %t, 99
+  call void @use(i8 %t)
+  ret i1 %r
+}
+
+
+define <2 x i1> @uge_nsw(<2 x i32> %x) {
+; CHECK-LABEL: @uge_nsw(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw <2 x i32> [[X:%.*]] to <2 x i8>
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt <2 x i8> [[T]], <i8 44, i8 44>
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %t = trunc nsw <2 x i32> %x to <2 x i8>
+  %r = icmp uge <2 x i8> %t, <i8 45, i8 45>
+  ret <2 x i1> %r
+}
+
+
+define <2 x i1> @uge_nsw_non_splat(<2 x i32> %x) {
+; CHECK-LABEL: @uge_nsw_non_splat(
+; CHECK-NEXT:    [[T:%.*]] = trunc nsw <2 x i32> [[X:%.*]] to <2 x i8>
+; CHECK-NEXT:    [[R:%.*]] = icmp ugt <2 x i8> [[T]], <i8 44, i8 45>
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %t = trunc nsw <2 x i32> %x to <2 x i8>
+  %r = icmp uge <2 x i8> %t, <i8 45, i8 46>
+  ret <2 x i1> %r
+}
+