ADDITIONAL SYSTEM INFORMATION :
- JAVA version: "25.0.3-internal" 2026-04-21 (I didn't find it in the drop-down box)
- Operating system: Linux
- Compiler/toolchain: GCC 9.4
- Source commit: 748bc9b1d3029fdaa66a2ba7bf8d02edc35edf3e
- Build type: fastdebug


A DESCRIPTION OF THE PROBLEM :
Running the following program in -Xcomp will output incorrect results:
```
String lv_String_1769426579536_77075171720402640:: `lmuffpccwhvawwgxihasdfasf123123`
String lv_String_1769426579536_77075171720402640:: `lmuffpccwhvawwgxihasdfasf123123`
unstable if: 5
```
`
Run the following program in -Xint and the result is normal:
```
unstable if: 4
```

Furthermore, if the content of the dontinline() function is empty (i.e., the code from line 7 to line 38 of the comment), the running result under -Xcomp will return to normal:
```
unstable if: 4
```

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java -Xcomp -Djdk.test.lib.random.seed=1 compiler.c2.TestMergeStoresAndAllocationElimination

---------- BEGIN SOURCE ----------
package compiler.c2;

public class TestMergeStoresAndAllocationElimination {
    static void dontinline() {
        String lv_String_1769426579536_77075171720402640 = new String("asdfasf123123");
        String lv_String_1769426579541_77075171762572811 = new String("");
        String lv_String_1769426579542_77075171780365412 = new String("");
        String lv_String_1769426579543_77075171783232983 = new String("");
        float lv_float_1769426579530_77075171661100560 = 912.6823f;
        float lv_float_1769426579541_77075171766088571 = 912.6823f;
        int lv_int_1769426579536_77075171716853370 = 522;
        int lv_int_1769426579541_77075171764661111 = 522;
        long lv_long_1769426579541_77075171765867741 = 83629L;
        long lv_long_1769426579541_77075171765679830 = 83629L;
        Object TmpVar_7707517178747179_1769426579543 = new Object();
        synchronized(TmpVar_7707517178747179_1769426579543) {
            lv_float_1769426579530_77075171661100560 = 246.278f;
            lv_String_1769426579536_77075171720402640 += (AllFuzzerDefs_1769426578553_43988.gb_String_1769426579536_77075171719166580);
            
            lv_String_1769426579541_77075171762572811 = lv_String_1769426579536_77075171720402640.replaceAll((lv_String_1769426579541_77075171762572811), (AllFuzzerDefs_1769426578553_43988.gb_String_1769426579540_77075171760669751));
            
            for (lv_int_1769426579541_77075171764661111 = 0; lv_int_1769426579541_77075171764661111 < (((lv_int_1769426579541_77075171764661111) + (lv_int_1769426579536_77075171716853370)) + AllFuzzerDefs_1769426578553_43988.gb_int_1769426579541_77075171765128071); lv_int_1769426579541_77075171764661111++) {
                lv_int_1769426579536_77075171716853370 = lv_int_1769426579536_77075171716853370 + lv_int_1769426579541_77075171764661111;
                if (false) { System.out.println("Ciallo～(∠·ω< )⌒★"); }
                lv_long_1769426579541_77075171765679830 = lv_long_1769426579541_77075171765867741;
                lv_String_1769426579536_77075171720402640 = "lmuffpccwhvawwgxih";
                lv_String_1769426579536_77075171720402640 += (AllFuzzerDefs_1769426578553_43988.gb_String_1769426579541_77075171766882722);
                
                lv_float_1769426579541_77075171766088571 = 756.8578f;
            
            }
            
                
        }
        
        System.out.println(("String lv_String_1769426579536_77075171720402640:: `" + lv_String_1769426579536_77075171720402640) + "`");
       
    }
    static int test(boolean flag) {
        int[] arr = new int[4];
   
        arr[0] = 0x10000;
        arr[1] = 0x100000;
        arr[2] = 0x100;
        arr[3] = 0x1000000;
    
        compiler.c2.TestMergeStoresAndAllocationElimination.dontinline();
    
        arr[0] = 0x1;
        arr[1] = 0x10;
       
        if (flag) {
            java.lang.System.out.println("unstable if: " + arr.length);
        }

        for (int i = 0; i < 10000; i++) {
            arr[3] = 0x1000;
        }

        return (((1 * arr[0]) + (2 * arr[1])) + (3 * arr[2])) + (4 * arr[3]);
    }
   
    public static void main(java.lang.String[] args) {
        // Capture interpreter result.
        int gold = compiler.c2.TestMergeStoresAndAllocationElimination.test(false);
        // Repeat until we get compilation.
        for (int i = 0; i < 10000; i++) {
            compiler.c2.TestMergeStoresAndAllocationElimination.test(false);
        }
        // Capture compiled results.
        int res0 = compiler.c2.TestMergeStoresAndAllocationElimination.test(false);
        int res1 = compiler.c2.TestMergeStoresAndAllocationElimination.test(true);
        if ((res0 != gold) || (res1 != gold)) {
            throw new java.lang.RuntimeException((((("Unexpected result: " + java.lang.Integer.toHexString(res0)) + " and ") + java.lang.Integer.toHexString(res1)) + ", should be: ") + java.lang.Integer.toHexString(gold));
        }
    }
}

class AllFuzzerDefs_1769426578553_43988 {

    public static int ARRAY_SIZE = 80;

    public static String gb_String_1769426579536_77075171719166580 = new String("asdfasf123123");

    public static String gb_String_1769426579541_77075171766882722 = new String("asdfasf123123");

    public static String gb_String_1769426579540_77075171760669751 = new String("asdfasf123123");

    public static int gb_int_1769426579541_77075171765128071 = 522;

    public static int gb_int_1769426579536_77075171717098860 = 522;

}

---------- END SOURCE ----------

FREQUENCY :
ALWAYS