picorv32/scripts/yosys-cmp/README.md

Synthesis results for the PicoRV32 core (in its default configuration) with Yosys 0.5+383 (git sha1 8648089), Synplify Pro and Lattice LSE from iCEcube2.2014.08, and Xilinx Vivado 2015.3.

No timing constraints were used for synthesis; only resource utilisation is compared.

Last updated: 2015-10-30

Results for iCE40 Synthesis

Cell	Yosys	Synplify Pro	Lattice LSE
SB_CARRY	405	349	309
SB_DFF	125	256	114
SB_DFFE	251	268	76
SB_DFFESR	172	39	147
SB_DFFESS	1	0	69
SB_DFFSR	69	137	134
SB_DFFSS	0	0	36
SB_LUT4	1795	1657	1621
SB_RAM40_4K	4	4	4

Summary:

Cell	Yosys	Synplify Pro	Lattice LSE
SB_CARRY	405	349	309
SB_DFF*	618	700	576
SB_LUT4	1795	1657	1621
SB_RAM40_4K	4	4	4

Results for Xilinx 7-Series Synthesis

Cell	Yosys	Vivado
FDRE	671	553
FDSE	0	21
LUT1	41	160
LUT2	517	122
LUT3	77	120
LUT4	136	204
LUT5	142	135
LUT6	490	405
MUXF7	54	0
MUXF8	15	0
MUXCY	420	0
XORCY	359	0
CARRY4	0	83
RAMD32	0	72
RAMS32	0	24
RAM64X1D	64	0

Summary:

Cell	Yosys	Vivado
FD*	671	574
LUT*	1403	1146