microwatt

Commit Graph

Author	SHA1	Message	Date
Paul Mackerras	0c714f1be6	execute: Move popcnt and prty instructions into the logical unit This implements logic in the logical entity to calculate the results of the popcnt* and prty* instructions. We now have one insn_type_t value for the 3 popcnt variants and one for the two prty variants, using the length field of the decode_rom_t to distinguish between them. The implementations in logical.vhdl using recursive algorithms rather than the simple functions in ppc_fx_insns.vhdl. This gives a saving of about 140 slice LUTs on the A7-100 and improves timing slightly. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>	6 years ago
Anton Blanchard	b8fb721b81	Consolidate logical instructions Consolidate and/andc/nand, or/orc/nor and xor/eqv, using a common invert on the input and output. This saves us about 200 LUTs. Signed-off-by: Anton Blanchard <anton@linux.ibm.com>	6 years ago

Author

SHA1

Message

Date

Paul Mackerras

0c714f1be6

execute: Move popcnt and prty instructions into the logical unit

This implements logic in the logical entity to calculate the results
of the popcnt* and prty* instructions.  We now have one insn_type_t
value for the 3 popcnt variants and one for the two prty variants,
using the length field of the decode_rom_t to distinguish between
them.  The implementations in logical.vhdl using recursive
algorithms rather than the simple functions in ppc_fx_insns.vhdl.

This gives a saving of about 140 slice LUTs on the A7-100 and
improves timing slightly.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

Anton Blanchard

b8fb721b81

Consolidate logical instructions

Consolidate and/andc/nand, or/orc/nor and xor/eqv, using a common
invert on the input and output. This saves us about 200 LUTs.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

2 Commits (f9f18906a3039c9dc773c85adc2d9d144a83030c)