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Give an example on how Unix and Win64 count argument differently

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H. Peter Anvin 2007-11-29 17:17:35 -08:00
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@ -6456,6 +6456,12 @@ All SSE and x87 registers are destroyed by function calls.
On 64-bit Unix, \c{long} is 64 bits.
Integer and SSE register arguments are counted separately, so for the case of
\c void foo(long a, double b, int c)
\c{a} is passed in \c{RDI}, \c{b} in \c{XMM0}, and \c{c} in \c{ESI}.
\H{win64} Interfacing to 64-bit C Programs (Win64)
The Win64 ABI is described at:
@ -6478,6 +6484,12 @@ return is \c{XMM0} only.
On Win64, \c{long} is 32 bits; \c{long long} or \c{_int64} is 64 bits.
Integer and SSE register arguments are counted together, so for the case of
\c void foo(long long a, double b, int c)
\c{a} is passed in \c{RCX}, \c{b} in \c{XMM1}, and \c{c} in \c{R8D}.
\C{trouble} Troubleshooting
This chapter describes some of the common problems that users have