Dan Sugalski <[EMAIL PROTECTED]> wrote:At 7:34 PM +0100 11/17/04, Leopold Toetsch wrote:
All registers are preserved, but some of these registers are used, either by implict opcodes or as return values.
Erm, no. Unused registers in the 0-15 range are explicitly garbage:
It was about usabalitiy of registers for the allocator. So before I make a function call, these are allocatable as temps. Return values are garbage, if not set.
As long as the allocator is set to assume that after a function call that all the registers in the range 0-15 that don't have return values are garbage. So if there are no string return values, string registers 0-15 are toast.
> Note that registers 16-31 of each of the four types are, forsecurity reasons, I<never> passed into the invoked subroutine, method, or continuation. They are guaranteed to be garbage.
Not quite. S and P regs have to be NULLed. Or you gonna tell the DOD system how to mark garbage ;)
No, the invoke op. -- Dan
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