Renesas M32R-FPU Manual Do Utilizador
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