Author: Gerd Isenberg
Date: 12:42:32 09/27/05
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On September 27, 2005 at 14:28:42, Dezhi Zhao wrote: >On September 27, 2005 at 12:20:27, Bo Persson wrote: > >>On September 27, 2005 at 00:56:20, Dezhi Zhao wrote: >> >>>VS2005 RC is finally up and running on Win x64 for me. >>>However I cannot find a template for a simple 64 bit console project. >>>Or, do I have to use command line? >>>I want to try some simple int and bit operations and take a look at the x86-64 >>>asm output. >>> >>>Any hints? Thanks >> >>Despite the name, you have to choose a Win32 Console Project. Then (if you have >>installed the 64 bit compiler) you can add an x64 target in the project >>properties. >> >>At least in the beta versions, the installer didn't install the 64 bit compiler >>unless you explicitly selected it... >> >> >> >>Bo Persson > >Thanks! Your trick works fine for me. > >Just took a look at the asm code and it seems to me there are no name for the >upper 32 bit part of a general 64 bit register. If you want to extract the upper >32 bits, the compiler generates a right shift operation. Yes, same already for x86-32 with 16-bit short values. 32-bit eax and 16-bit ax, but for the upper 16bit you have to shift 16 right ;-) Only bytewise registers are accessible in low/high manner from a 64/32/16-bit register. Note that operating on a 32-bit target register implicitely clears the 32-upper bits. Therefor the hint to use unsigned int as index, because the zero extension of the required 64-bit address operand register is free, while signed int requires explicite sign extension. Gerd
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