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3 Commits

Author SHA1 Message Date
Richard Henderson d3d1c30c63 tcg/i386: Improve TSTNE/TESTEQ vs powers of two 
Use "test x,x" when the bit is one of the 4 sign bits.
Use "bt imm,x" otherwise.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2024-02-03 23:53:49 +00:00
Richard Henderson 36df88c040 tcg/i386: Drop BYTEH deposits for 64-bit 
It is more useful to allow low-part deposits into all registers
than to restrict allocation for high-byte deposits.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2023-08-24 11:22:42 -07:00
Richard Henderson 358b492392 tcg/i386: Split out target constraints to tcg-target-con-str.h 
This eliminates the target-specific function target_parse_constraint
and folds it into the single caller, process_op_defs.  Since this is
done directly into the switch statement, duplicates are compilation
errors rather than silently ignored at runtime.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 2021-02-02 12:12:29 -10:00