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cannot run test_throw in test_rpython along with other pytests
(especially tests from c script). Will look into this later

currently its not working because we cannot restore callee saved
regsiter from the last frame (or the rust frame to throw exception).
One solution is to save all the callee saved registers in a function
that can throw.

(cannot load this test as dylib, it would involve PIC code on linux)

info

--disable-inline

cargo test

replacing most uses of HashMap with LinkedHashMap. This will reduce (if not eliminate) undeterminism in the compilation.
Copied LinkedHashMap implementation to local so that I can implement encode/decode and other necessary methods

a jump that directly is directly followed by a label of its target
can be removed.

1. asm call do not use all argument registers (otherwise it will keep
them alive)
2. spilling a register that is used and defined in one instruction will
result in creating one new temporary, instead of two
3. spilling now deals with floating point
4. SELECT with int8 is implemented using conditional jump (cmov cannot
take reg8)
5. postcall convention now deals correctly with fp return values
6. reg alloc conservative() was wrong in a few commits ago, fixed it
7. in liveness analysis, when finding a move between a temp and a
register, find the color for the register (such as RAX for EAX)

currently mov constant as imm to a GPR, then mov from GPR
to xmm. A better approach should be put the immediate in memroy,
and load it

when we add interefence between %a and %edi, we also add %a with %rdi
because we cannot assign rdi to a

for movl %edi %edi (where two operands are actually %edi %rdi), we will
do a check, and ensure it get removed

changed a condition on coealescing. Fixed a bug in spilling rewrite.
Currently test_extern_Func is broken

was using nalgebra::DMatrix to implement a graph

1. see vm/vm_options.rs for usage and default values
2. added mu_fastimpl_new_with_opts under vm/api/api_impl/muvm.rs

introduced Move instruction at IR level.
Intermediate blocks will be inserted for multi-target branch
instructions