Alyssa Rosenzweig b1231c24ef OpcodeDispatcher: Omit AF xor for common constants ...

The only reason we need to XOR arguments for AF is to get bit 4 correct. But if
the operand in question is known to have bit 4 clear, the XOR will be an
effective no-op and can be skipped. This saves an instruction in a bunch of
common cases, like inc/dec. If we dedicated a register to AF to eliminate the
store, we would not save an instruction from this but would still come out ahead
due to an eor turning into a (zero cycle?) mov that can be handled by the
renamer.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

2023-09-22 19:08:26 -04:00

..

Crypto.cpp

FEXCore/Interface/Core/OpcodeDispatcher: Adds SPDX identifier

2023-09-19 17:33:15 -07:00

Flags.cpp

OpcodeDispatcher: Omit AF xor for common constants

2023-09-22 19:08:26 -04:00

Vector.cpp

FEXCore/Interface/Core/OpcodeDispatcher: Adds SPDX identifier

2023-09-19 17:33:15 -07:00

X87.cpp

OpcodeDispatcher: Remove pointless or

2023-09-21 09:13:41 -04:00

X87F64.cpp

FEXCore/Interface/Core/OpcodeDispatcher: Adds SPDX identifier

2023-09-19 17:33:15 -07:00