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)
FPSR is accessed by an MVFC instruction after the FPU instruction is executed
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
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