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  1. Embedded Software & Tools
  2. EXT_EP-9788

32-bit and operation with small constant incorrectly computed with 16-bit wide instruction

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    • Icon: Bug Bug
    • Resolution: Cannot Reproduce
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    • Code Generation Tools
    • CODEGEN-7479
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      C2000_18.1.4.LTS
      C2000_20.2.1.LTS
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      C2000_18.1.4.LTS C2000_20.2.1.LTS
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    • No test case provided showing wrong results.

      The attached source file has this line ...

              MaskData = RawData & ~(0x00001000 | 0x00000100 | 0x00000010);

      All variables are of type long. Build it ...

      % cl2000 -@options.txt try1.c
"try1.c", line 4: warning #552-D: variable "MaskData" was set but never used

      The key assembly instructions emitted are ...

              AND       AL,#61167             ; [CPU_ALU] |7|
        MOVL      *-SP[4],ACC           ; [CPU_ALU] |7|

      The AND instruction needs to operate on all 32-bits of the accumulator. I think this one only operates on the lower 16-bits, and clears the upper 32-bits.

            syncuser TI User
            syncuser TI User
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              Created:
              Updated:
              Resolved: