Commit bf28a69e authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

qemu-tech: move text from qemu-tech to tcg/README 



Reviewed-by: default avatarEmilio G. Cota <cota@braap.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 81f265a8

qemu-tech.texi

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@@ -287,16 +287,8 @@ are very complicated and highly CPU dependent. QEMU uses some tricks 
which make it relatively easily portable and simple while achieving good

performances.



After the release of version 0.9.1, QEMU switched to a new method of

generating code, Tiny Code Generator or TCG. TCG relaxes the

dependency on the exact version of the compiler used. The basic idea

is to split every target instruction into a couple of RISC-like TCG

ops (see @code{target-i386/translate.c}). Some optimizations can be

performed at this stage, including liveness analysis and trivial

constant expression evaluation. TCG ops are then implemented in the

host CPU back end, also known as TCG target (see

@code{tcg/i386/tcg-target.inc.c}). For more information, please take a

look at @code{tcg/README}.

QEMU's dynamic translation backend is called TCG, for "Tiny Code

Generator". For more information, please take a look at @code{tcg/README}.



@node Condition code optimisations

@section Condition code optimisations

tcg/README

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@@ -8,6 +8,11 @@ in the QOP code generator written by Paul Brook. 


2) Definitions



TCG receives RISC-like "TCG ops" and performs some optimizations on them,

including liveness analysis and trivial constant expression

evaluation.  TCG ops are then implemented in the host CPU back end,

also known as the TCG "target".



The TCG "target" is the architecture for which we generate the

code. It is of course not the same as the "target" of QEMU which is

the emulated architecture. As TCG started as a generic C backend used