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[Qemu-devel] [PATCH 6/8] Use proper term in TCG README
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 6/8] Use proper term in TCG README |
Date: |
Fri, 22 Mar 2013 16:14:19 +0100 |
From: 陳韋任 (Wei-Ren Chen) <address@hidden>
In TCG, "target" means the host architecture for which TCG generates
the code. Using "guest" rather than "target" to make the document more
consistent.
Signed-off-by: Chen Wei-Ren <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
tcg/README | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/tcg/README b/tcg/README
index 934e7af..063aeb9 100644
--- a/tcg/README
+++ b/tcg/README
@@ -14,6 +14,10 @@ the emulated architecture. As TCG started as a generic C
backend used
for cross compiling, it is assumed that the TCG target is different
from the host, although it is never the case for QEMU.
+In this document, we use "guest" to specify what architecture we are
+emulating; "target" always means the TCG target, the machine on which
+we are running QEMU.
+
A TCG "function" corresponds to a QEMU Translated Block (TB).
A TCG "temporary" is a variable only live in a basic
@@ -379,7 +383,7 @@ double-word product T0. The later is returned in two
single-word outputs.
Similar to mulu2, except the two inputs T1 and T2 are signed.
-********* 64-bit target on 32-bit host support
+********* 64-bit guest on 32-bit host support
The following opcodes are internal to TCG. Thus they are to be implemented by
32-bit host code generators, but are not to be emitted by guest translators.
@@ -521,9 +525,9 @@ register.
a better generated code, but it reduces the memory usage of TCG and
the speed of the translation.
-- Don't hesitate to use helpers for complicated or seldom used target
+- Don't hesitate to use helpers for complicated or seldom used guest
instructions. There is little performance advantage in using TCG to
- implement target instructions taking more than about twenty TCG
+ implement guest instructions taking more than about twenty TCG
instructions. Note that this rule of thumb is more applicable to
helpers doing complex logic or arithmetic, where the C compiler has
scope to do a good job of optimisation; it is less relevant where
@@ -531,9 +535,9 @@ register.
inline TCG may still be faster for longer sequences.
- The hard limit on the number of TCG instructions you can generate
- per target instruction is set by MAX_OP_PER_INSTR in exec-all.h --
+ per guest instruction is set by MAX_OP_PER_INSTR in exec-all.h --
you cannot exceed this without risking a buffer overrun.
- Use the 'discard' instruction if you know that TCG won't be able to
prove that a given global is "dead" at a given program point. The
- x86 target uses it to improve the condition codes optimisation.
+ x86 guest uses it to improve the condition codes optimisation.
--
1.8.1.4
- [Qemu-devel] [PULL 0/8] Trivial patches for 9 to 22 March 2013, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 1/8] MinGW: Replace setsockopt by qemu_setsocketopt, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 2/8] memory: fix a bug of detection of memory region collision, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 3/8] Advertise --libdir in configure --help output, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 4/8] Fix typos and misspellings, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 7/8] gitignore: ignore more files, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 5/8] serial: Fix debug format strings, Stefan Hajnoczi, 2013/03/22
- [Qemu-devel] [PATCH 6/8] Use proper term in TCG README,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH 8/8] qdev: remove redundant abort(), Stefan Hajnoczi, 2013/03/22