SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
32-Bit Floating-Point Addition
MRa | CLA floating-point destination register (MR0 to MR3) |
MRb | CLA floating-point source register (MR0 to MR3) |
#16FHi | A 16-bit immediate value that represents the upper 16-bits of an IEEE 32-bit floating-point value. The low 16-bits of the mantissa are assumed to be all 0. |
LSW: IIII IIII IIII IIII
MSW: 0111 0111 1100 bbaa
Add MRb to the floating-point value represented by the immediate operand. Store the result of the addition in MRa.
#16FHi is a 16-bit immediate value that represents the upper 16-bits of an IEEE 32-bit floating-point value. The low 16-bits of the mantissa are assumed to be all 0. #16FHi is most useful for representing constants where the lowest 16-bits of the mantissa are 0. Some examples are 2.0 (0x40000000), 4.0 (0x40800000), 0.5 (0x3F000000), and -1.5 (0xBFC00000). The assembler accepts either a hex or float as the immediate value. That is, the value -1.5 can be represented as #-1.5 or #0xBFC0.
MRa = MRb + #16FHi:0;
This instruction can also be written as MADDF32 MRa, #16FHi, MRb.
This instruction modifies the following flags in the MSTF register:
Flag | TF | ZF | NF | LUF | LVF |
---|---|---|---|---|---|
Modified | No | No | No | Yes | Yes |
The MSTF register flags are modified as follows:
This is a single-cycle instruction.
; X is an array of 32-bit floating-point values
; Find the maximum value in an array X
; and store the value in Result
;
_Cla1Task1:
MMOVI16 MAR1,#_X ; Start address
MUI16TOF32 MR0, @_len ; Length of the array
MNOP ; delay for MAR1 load
MNOP ; delay for MAR1 load
MMOV32 MR1, *MAR1[2]++ ; MR1 = X0
LOOP
MMOV32 MR2, *MAR1[2]++ ; MR2 = next element
MMAXF32 MR1, MR2 ; MR1 = MAX(MR1, MR2)
MADDF32 MR0, MR0, #-1.0 ; Decrement the counter
MCMPF32 MR0 #0.0 ; Set/clear flags for MBCNDD
MNOP
MNOP
MNOP
MBCNDD LOOP, NEQ ; Branch if not equal to zero
MMOV32 @_Result, MR1 ; Always executed
MNOP ; Always executed
MNOP ; Always executed
MSTOP ; End of task
; Show the basic operation of MADDF32
;
; Add to MR1 the value 2.0 in 32-bit floating-point format
; Store the result in MR0
MADDF32 MR0, MR1, #2.0 ; MR0 = MR1 + 2.0
; Add to MR3 the value -2.5 in 32-bit floating-point format
; Store the result in MR2
MADDF32 MR2, MR3, #-2.5 ; MR2 = MR3 + (-2.5)
; Add to MR0 the value 0x3FC00000 (1.5)
; Store the result in MR0
MADDF32 MR0, MR0, #0x3FC0 ; MR0 = MR0 + 1.5