Legup Wiki

Working:

• Structs in Verilog, steering code based on size, alignment, byte enables
• .mif generation of any struct
• get element pointer of any struct
• Struct assignment, which boils down to memset, memcpy, which in turn boils down to casting struct ptr to long long ptr
• Alignments are handled with a self-defined TargetData
• Pointers in struct, pointers to structs (reduce pointers to 32 bits)
• Comparison to NULL pointer

DMIPS/MHz (on anything):

• 1.06 DMIPS/MHz

DMIPS (on Cyclone II with peephole optimizations):

• Running 21 Dhrystones - 20 Dhrystones = 491 cycles
• Fmax = 196.46 MHz
• 1 Dhrystone = 2.499 us
• 400,120 Dhrystones per second
• 227.7 DMIPS

DMIPS (on Stratix II):

• Fmax = 237.02 MHz ( period = 4.219 ns )
• 251 DMIPS

Without inlining (inlining is not allowed by dhrystone)

NIOS II fast (modelsim) at 50MHz

• 20 Dhrystones = 490 us
• 1 Dhrystone = 24.5 us
• 40,816 Dhrystones per second
• 23.2 DMIPS
• 0.46 DMIPS/MHz
• NIOS II fast can go up to ~187 MHz → 86 DMIPS

Tiger MIPS at 25MHz

• 20 Dhrystones = 1154 us
• 1 Dhrystone = 57.7 us
• 17,331 Dhrystones per second
• 9.9 DMIPS
• 0.40 DMIPS/MHz

OLD DMIPS/MHz (on anything):

• 1.07 DMIPS/MHz

OLD DMIPS (on Cyclone II):

• Running 21 Dhrystones - 20 Dhrystones = 534 cycles
• 84.37 MHz (period = 11.853 ns)
• 1 Dhrystone = 6.3295 us
• 157,990 Dhrystones per second
• 89.9 DMIPS

OLD DMIPS (on Stratix II):

• 134.75 MHz (period = 7.421 ns)
• 144.2 DMIPS