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- test macro system
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- test conditional jumps
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- test mul, div, ext8s, ext16s, bswap
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- generate a global TB prologue and epilogue to save/restore registers
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  to/from the CPU state and to reserve a stack frame to optimize
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  helper calls. Modify cpu-exec.c so that it does not use global
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  register variables (except maybe for 'env').
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- fully convert the x86 target. The minimal amount of work includes:
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  - add cc_src, cc_dst and cc_op as globals
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  - disable its eflags optimization (the liveness analysis should
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    suffice)
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  - move complicated operations to helpers (in particular FPU, SSE, MMX).
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- optimize the x86 target:
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  - move some or all the registers as globals
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  - use the TB prologue and epilogue to have QEMU target registers in
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    pre assigned host registers.
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Ideas:
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- Move the slow part of the qemu_ld/st ops after the end of the TB.
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- Experiment: change instruction storage to simplify macro handling
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  and to handle dynamic allocation and see if the translation speed is
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  OK.
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- change exception syntax to get closer to QOP system (exception
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  parameters given with a specific instruction).