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

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-06 15:10:10 +02:00
parent 81f265a8a4
commit bf28a69eeb
2 changed files with 7 additions and 10 deletions
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12
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 which make it relatively easily portable and simple while achieving good
performances. performances.
After the release of version 0.9.1, QEMU switched to a new method of QEMU's dynamic translation backend is called TCG, for "Tiny Code
generating code, Tiny Code Generator or TCG. TCG relaxes the Generator". For more information, please take a look at @code{tcg/README}.
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}.
@node Condition code optimisations @node Condition code optimisations
@section Condition code optimisations @section Condition code optimisations

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tcg/README
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@ -8,6 +8,11 @@ in the QOP code generator written by Paul Brook.
2) Definitions 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 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 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 the emulated architecture. As TCG started as a generic C backend used