Program Actions

LD F0 FLB1

• Sets FLB1 tag in FPR0; when the data arrives in FLB1 it is copied into FPR0

LD F1 FLB2

• Sets FLB2 tag in FPR1; before the data arrives, the tag has been moved to Multiply RS1 Source, so the data goes there instead

MUL F1 FLB3

• Uses Multiply Reservation Station 1
• Copies FLB2 tag from FPR1 to RS1 Sink and sets Multiply RS1 tag in FPR1
• Sets FLB3 tag in RS1 Source; when the data arrives in FLB3 it is copied into RS1 Source
• When result appears on CDB it is copied into FPR1 and Add RS1 Source

ADD F0 F1

• Uses Add Reservation Station 1
• Copies data from FPR0 to RS1 Sink and sets Add RS1 tag in FPR0
• Copies Multiply RS1 tag from FPR1 to RS1 Source
• When result appears on CDB it is copied into Add RS2 Sink

LD F2 FLB4

• Sets FLB4 tag in FPR2; before the data arrives in FLB4, the tag has been moved into Multiply RS2 Source so the data goes there instead

MUL F2 FLB5

• Uses Multiply Reservation Station 2
• Copies FLB4 tag from FPR2 to RS2 Sink and sets Multiply RS2 tag in FPR2
• Sets FLB5 tag in RS2 Source; when data arrives in FLB5 it is copied into Multiply RS2 Source
• When result appears on CDB it is copied into FPR2 and Add RS2 Source

ADD F0 F2

• Uses Add Reservation Station 2
• Copies Add RS1 tag from FPR0 to RS2 Source and sets Add RS2 tag in FPR0
• Copies Multiply RS2 tag from FPR2 to RS2 Sink
• When result appears on CDB it is copied into Add RS3 Sink

LD F3 FLB6

• Sets FLB6 tag in FPR3; as the data arrives in FLB6, the tag is being moved into Multiply RS2 Source so the data goes there instead

MUL F3 FLB1

• Uses Multiply Reservation Station 1
• Sets Multiply RS1 tag in FPR3
• Takes FLB6 tag from FPR3, but FLB6 tag and data appear on the CDB before the tag is sent to RS1 Sink, so the data is sent instead
• Sets FLB1 tag in RS1 Source
• When result appears it is copied into FPR3 and Add RS3 Source

ADD F0 F3

• Uses Add Reservation Station 3
• Copies Add RS1 tag from FPR0 to RS3 Sink and sets Add RS3 tag in FPR0
• Copies Multiply RS2 tag from FPR3 into RS3 Source
• When result appears it is copied into Add RS1 Sink

LD F1 FLB2

• Sets FLB2 tag in FPR1; when the data arrives it is copied into Multiply RS1 Source

MUL F1 FLB3

• Uses Multiply Reservation Station 2
• Takes Add RS3 tag from FPR1, but this tag appears on the CDB before the tag is sent to Multiply RS2 source, so data is sent instead
• Sets Multiply RS2 tag in FPR1
• Would set FLB3 tag in RS2 Source, but FLB3 tag and data appear on the CDB before the tag is sent to RS2, so data is sent instead
• When result appears it is copied into FPR1 and Add RS1 Source

ADD F0 F1

• Uses Add Reservation Station 1
• Copies Add RS3 tag from FPR0 to RS1 Sink and sets Add RS1 tag in FPR0
• Copies Multiply RS2 tag from FPR1 to RS1 Source
• When result appears it is copied into FPR0 and SDB1

ST F0 SDB1

• Copies Add RS1 tag from FPR0 into SDB1. When the data arrives it is sent to Memory