Summary of changes from 5.54 to 5.57

Summary of changes from 5.54 to 5.55

• Added support for __packed structures and pointers.
• Inline assembler (as per ARM ADS).
• Added Thumb interworking (-APCS /inter).
• int f() { } is now correctly treated as an old-style function - use int f(void) { } instead.
• Improved error reporting for function arguments.
• C99 pragmas added
• C99 concatenation of wide and normal string literals supported.
• Support for LDRH etc added.
• -Otime and -Ospace now have more effect.
• CSE optimises long long expressions.
• Optimisation of static integer and floating const variables.
• long long shifts by constant much improved.
• All long long multiplies will now be inlined (if -cpu 3M or later and -Otime). Can also generate SMLAL and UMLAL.
• ARMv5 BLX instruction used for faster function pointer calls.
• Other more complex function pointer forms (such as MOV lr,pc; LDR pc,xxx) reinstated; these had been disabled at some point between 5.02 and 5.54 as a bug workaround.
• Very slow CSE analysis of complex functions (eg various cyphers) fixed.
• Header file guard #defines interpreted and handled internally (a speed optimisation which saves having to reload header files).
• Improved compile-time evaluation of floating arithmetic.
• Able to inline more functions. Now knows the CNF instruction.
• FPA float->double conversions no longer eliminated (for correct behaviour with signalling NaNs and underflow traps).
• Fixes to inline functions with difficult return types.
• Many general code generation improvements and bug fixes.
• Constant data placed in read-only area.
• Mapping symbols ($d/$a) now placed in object file to aid DecAOF and DDT.
• long long variables now output correctly in debugging information, (requires latest version of DDT).
• Changes to warning control options (see below).
• -zz and -zt options to control data allocation.
• APCS-A and APCS-M support removed.