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3-52

M32R-FPU Software Manual (Rev.1.01)

INSTRUCTIONS

3.2 Instruction description

FSUBFSUB

[Mnemonic]

FSUB Rdest,Rsrc1,Rsrc2

[Function]

Floating-point subtract

Rdest = Rsrc1 - Rsrc2 ;

[Description]

Subtract the floating-point single precision value stored in Rsrc2 from the floating-point single

precision value stored in Rsrc1 and store the results in Rdest. The result is rounded according to

the RM field of FPSR. The DN bit of FPSR handles the modification 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 subtract

[M32R-FPU Extended Instruction]

src11101 src20000 dest0000 00000100

FSUB Rdest,Rsrc1,Rsrc2

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 193 194

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