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M32R-FPU Software Manual (Rev.1.01)
INSTRUCTIONS
3.2 Instruction description
FMADDFMADD
[Mnemonic]
FMADD Rdest,Rsrc1,Rsrc2
[Function]
Floating-point multiply and add
Rdest = Rdest + Rsrc1 * Rsrc2 ;
[Description]
This instruction is executed in the following 2 steps.
● Step 1
Multiply the floating-point single precision value stored in Rsrc1 by the floating-point single
precision value stored in Rsrc2.
The multiplication result is rounded toward 0 regardless of the value in the RM field of FPSR.
● Step 2
Add the result of Step 1 (the rounded value) and the floating-point single precision value stored
in Rdest. The result is rounded according to the RM field of FPSR.
The result of this operation is stored in Rdest. Exceptions are determined in both Step 1 and
Step 2. The DN bit of FPSR handles the conversion of denormalized numbers. The condition bit
(C) remains unchanged.
[EIT occurrence]
Floating-Point Exceptions (FPE)
• Unimplemented Operation Exception (UIPL)
• Invalid Operation Exception (IVLD)
• Overflow (OVF)
• Underflow (UDF)
• Inexact Exception (IXCT)
[Encoding]
floating-point Instructions
Floating-point multiply and add
[M32R-FPU Extended Instruction]
src11101 src20000 dest0011 00000000
FMADD Rdest,Rsrc1,Rsrc2