A Quick Comparison

There are just a few language related aspects of CLAXP that are known to differ compared to the compiler in Visual C++ on Intel platforms. Compared to the CL386 compiler:

CLAXP handles type 'long double' as a 64-bit floating point type (rather than an 80-bit type).
CLAXP does not support any kind of asm statement.
Various predefined macros are adjusted to be appropriate to the Alpha AXP environment.
CLAXP does not support P-Code.
CLAXP does not produce assembler source files (it does produce assembly listings with assembled code bytes).

CLAXP adds these Alpha AXP specific characteristics:

64-bit integer support.
Several hardware specific intrinsic functions.

CLAXP adds support for these known Microsoft C/C++ features:

structured exception handling
__unaligned type qualifier
Thread Local Storage
dllexport/dllimport