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target/i386: document more deviations from the manual

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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-10-23 09:58:48 +02:00
parent 2455e9cf5a
commit 8147df44da
1 changed files with 12 additions and 0 deletions
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target/i386/tcg/decode-new.c.inc
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@ -26,6 +26,13 @@
* size (X86_SIZE_*) codes used in the manual. There are a few differences
* though.
*
* Operand sizes
* -------------
*
* The manual lists d64 ("cannot encode 32-bit size in 64-bit mode") and f64
* ("cannot encode 16-bit or 32-bit size in 64-bit mode") as modifiers of the
* "v" or "z" sizes. The decoder simply makes them separate operand sizes.
*
* Vector operands
* ---------------
*
@ -44,6 +51,11 @@
* if the difference is expressed via prefixes. Individual instructions
* are separated by prefix in the generator functions.
*
* There is a custom size "xh" used to address half of a SSE/AVX operand.
* This points to a 64-bit operand for SSE operations, 128-bit operand
* for 256-bit AVX operands, etc. It is used for conversion operations
* such as VCVTPH2PS or VCVTSS2SD.
*
* There are a couple cases in which instructions (e.g. MOVD) write the
* whole XMM or MM register but are established incorrectly in the manual
* as "d" or "q". These have to be fixed for the decoder to work correctly.