diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2023-10-23 09:58:48 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-12-29 22:03:05 +0100 |
| commit | 8147df44daea383256964d2aeeed14bcfc8f63ce (patch) | |
| tree | 9f29dbc5b468b32f064af13a5b106fb0e4bfccbb | |
| parent | 2455e9cf5ac74fb42224309aa93ee8c3fd4b23e0 (diff) | |
target/i386: document more deviations from the manual
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target/i386/tcg/decode-new.c.inc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index 2bdbb1bba0..232c6a45c9 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -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. |