[InstCombine] Add pre-commit tests. NFC.

Author: dtcxzyw

llvm/test/Transforms/InstCombine/not.ll

@@ -769,3 +769,96 @@ entry:
   %cmp = icmp sle i32 %select, %not.c
   ret i1 %cmp
 }
+
+define i32 @test_sext(i32 %a, i32 %b){
+; CHECK-LABEL: @test_sext(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[A:%.*]], 0
+; CHECK-NEXT:    [[SEXT:%.*]] = sext i1 [[CMP]] to i32
+; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SEXT]], [[B:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[ADD]], -1
+; CHECK-NEXT:    ret i32 [[NOT]]
+;
+  %cmp = icmp eq i32 %a, 0
+  %sext = sext i1 %cmp to i32
+  %add = add i32 %b, %sext
+  %not = xor i32 %add, -1
+  ret i32 %not
+}
+
+define <2 x i32> @test_sext_vec(<2 x i32> %a, <2 x i32> %b){
+; CHECK-LABEL: @test_sext_vec(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq <2 x i32> [[A:%.*]], zeroinitializer
+; CHECK-NEXT:    [[SEXT:%.*]] = sext <2 x i1> [[CMP]] to <2 x i32>
+; CHECK-NEXT:    [[ADD:%.*]] = add <2 x i32> [[SEXT]], [[B:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i32> [[ADD]], <i32 -1, i32 -1>
+; CHECK-NEXT:    ret <2 x i32> [[NOT]]
+;
+  %cmp = icmp eq <2 x i32> %a, zeroinitializer
+  %sext = sext <2 x i1> %cmp to <2 x i32>
+  %add = add <2 x i32> %b, %sext
+  %not = xor <2 x i32> %add, <i32 -1, i32 -1>
+  ret <2 x i32> %not
+}
+
+define i32 @test_zext_nneg(i32 %a, i32 %b){
+; CHECK-LABEL: @test_zext_nneg(
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[B:%.*]], -1
+; CHECK-NEXT:    ret i32 [[NOT]]
+;
+  %cmp = icmp eq i32 %a, 0
+  %sext = zext nneg i1 %cmp to i32
+  %add = add i32 %b, %sext
+  %not = xor i32 %add, -1
+  ret i32 %not
+}
+
+define i8 @test_trunc(i8 %a){
+; CHECK-LABEL: @test_trunc(
+; CHECK-NEXT:    [[ZEXT:%.*]] = zext i8 [[A:%.*]] to i32
+; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[ZEXT]], -1
+; CHECK-NEXT:    [[SHR:%.*]] = ashr i32 [[SUB]], 31
+; CHECK-NEXT:    [[CONV:%.*]] = trunc i32 [[SHR]] to i8
+; CHECK-NEXT:    [[NOT:%.*]] = xor i8 [[CONV]], -1
+; CHECK-NEXT:    ret i8 [[NOT]]
+;
+  %zext = zext i8 %a to i32
+  %sub = add nsw i32 %zext, -1
+  %shr = ashr i32 %sub, 31
+  %conv = trunc i32 %shr to i8
+  %not = xor i8 %conv, -1
+  ret i8 %not
+}
+
+define <2 x i8> @test_trunc_vec(<2 x i8> %a){
+; CHECK-LABEL: @test_trunc_vec(
+; CHECK-NEXT:    [[ZEXT:%.*]] = zext <2 x i8> [[A:%.*]] to <2 x i32>
+; CHECK-NEXT:    [[SUB:%.*]] = add nsw <2 x i32> [[ZEXT]], <i32 -1, i32 -1>
+; CHECK-NEXT:    [[SHR:%.*]] = ashr <2 x i32> [[SUB]], <i32 31, i32 31>
+; CHECK-NEXT:    [[CONV:%.*]] = trunc <2 x i32> [[SHR]] to <2 x i8>
+; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i8> [[CONV]], <i8 -1, i8 -1>
+; CHECK-NEXT:    ret <2 x i8> [[NOT]]
+;
+  %zext = zext <2 x i8> %a to <2 x i32>
+  %sub = add nsw <2 x i32> %zext, <i32 -1, i32 -1>
+  %shr = ashr <2 x i32> %sub, <i32 31, i32 31>
+  %conv = trunc <2 x i32> %shr to <2 x i8>
+  %not = xor <2 x i8> %conv, <i8 -1, i8 -1>
+  ret <2 x i8> %not
+}
+
+; Negative tests
+
+define i32 @test_zext(i32 %a, i32 %b){
+; CHECK-LABEL: @test_zext(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[A:%.*]], 0
+; CHECK-NEXT:    [[SEXT:%.*]] = zext i1 [[CMP]] to i32
+; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SEXT]], [[B:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[ADD]], -1
+; CHECK-NEXT:    ret i32 [[NOT]]
+;
+  %cmp = icmp eq i32 %a, 0
+  %sext = zext i1 %cmp to i32
+  %add = add i32 %b, %sext
+  %not = xor i32 %add, -1
+  ret i32 %not
+}