Renesas M32R-FPU - Manual (Page 172)

APPENDICES
APPENDICES-14 M32R-FPU Software Manual (Rev.1.01)
Appendix Figure 3.2.5 Pipeline Flow with Stalls (3)
<Case 6> FPSR is accessed by an MVFC instruction after the FPU instruction is executed
<Case 7> The operation result of the FPU instruction is used by the subsequent instruction
IF D E1 WB FADD R0,R1,R2
IF D WB E
E2
MVFC R3, FPSR stall stall
IF D E1 WB FADD R0 ,R1,R2
IF D E2 WB E1
E2
FADD R3, R0 ,R4 stall stall
IF D EM WB FMADD R0 ,R1,R2
IF D E2 WB EA
EA E2
EM FMADD R0 ,R3,R4 stall stall
IF D EM WB FMADD R0 ,R1,R2
IF D E2 WB EA
EA E2
EM FMADD R3, R0 ,R4 stall stall stall
<Case 5> The PSW is written by an MVTC, SETPSW, or CLRPSW instruction and
the subsequent instruction reads R15
IF D E WB MVTC R1, PSW
IF D WB E SUB R3, R15 stall
APPENDIX 3
Appendix 3 Pipeline Processing