The regmove and regfill instructions temporarily divert a value's
location, and these temporary diversions are not reflected in
`func.locations`. For now, make an extra scan through the instructions
of the function to find any regmove or regfill instructions in order to
find all used callee-saved registers.
This fixes#296.
The main use for non-PIC code at present is JIT code, and JIT code can
live anywhere in memory and reference other symbols defined anywhere in
memory, so it needs to use the "large" code model.
func_addr and globalsym_addr instructions were already using `movabs`
to support arbitrary 64-bit addresses, so this just makes calls be
legalized to support arbitrary 64-bit addresses also.
* Only save callee-saved registers that are actually being used.
* Rename AllocatableSet to RegisterSet
* Style cleanup and small renames for readability.
* Adjust x86 prologue-epilogue test to account for callee-saved register optimization.
* Add more tests for prologue-epilogue optimizations.
To keep cross-compiling straightforward, Cretonne shouldn't have any
behavior that depends on the host. This renames the "Native" calling
convention to "SystemV", which has a defined meaning for each target,
so that it's clear that the calling convention doesn't change
depending on what host Cretonne is running on.
The term "local variables" predated the SSA builder in the front-end
crate, which also provides a way to implement source-language local
variables. The name "explicit stack slot" makes it clear what this
construct is.
* Use imm64 rather than offset32
* Add predicate to enforce signed 32-bit limit to imm
* Remove AdjustSpImm format
* Add encoding tests for adjust_sp_imm
* Adjust use of adjust_sp_imm in Intel prologue_epilogue to match
