keil c251 v5.54 官方开发工具 -澳门皇冠贵宾会网址

》keil c251详细介绍》

• [c251 compiler]
• • added: optimization for handling of 32 bit numbers.
  • added: optimization for for functions that do never return. this functions need to use .
  • corrected: assembler instructions used as label name erroneously thrown an syntax-error in src mode.
  • corrected: a potential inline-assembler macro problem with '#' when meant for the #imm operand. example:

    #pragma src
    #define aop         \ 
       __asm { nop }    \ 
       __asm { mov a,#1 }    // incorrect generated error c302: misused # operator
    void main (void) {
      aop
    }
    

  • corrected: incorrect error c143 "initializer is not a constant" generation at cast of a constant pointer which is part of a struct. example:

    struct glstruct {
      char a;
      char carr[1];
    };
    long offset = (long) (*(struct glstruct*)0x0d000000).carr;   // incorrect generated error: c143 "initializer is not a constant"
    

  • corrected: incorrect error c83 "incompatible types" generation when used floating point types togehter with & operator. example:

     volatile unsigned long  ul2;
     volatile signed char    sc1;
     volatile signed char    sc2;
     void main(void) {
       ul2 = 2147483647l;
       sc1 = -1;
       sc2 = 1;
       (ul2 ^= (((( ! ( (double) (char)127))) > ((( -- sc2)))) & sc1));  // incorrect generated error c83: '&': incompatible types
     }
    

  • corrected: huge at function definition is not allowed. erroneously has been taken as near. example:

    void huge hg_fnc() {  }   // the warning c65: 'hg_fnc': illegal use of near/far/huge will be generated.
    

• [l251 linker]
• • corrected: a potential incorrect overlap of data segments when this features are used in combination:
    • overlapping segments by command line directives.
    • linker code packing optimization with rom (huge) model.
    • code segments placed in the same 64kb region as the data segments.
• [a251 assembler]
• • added: support for forward slash (/) as path seperator.
• [c run-time library]
• • corrected: the function free failed when the complete memory pool was allocated.
  • corrected: the hptr variant of the function float log does not work.
• [μvision]
• • this c251 release is delivered with μvision v4.60.6.9 ide.