SPRUHX5I August 2014 – May 2024 TMS320F28374S , TMS320F28375S , TMS320F28375S-Q1 , TMS320F28376S , TMS320F28377S , TMS320F28377S-Q1 , TMS320F28378S , TMS320F28379S
32-Bit Floating-Point Maximum
MRa | CLA floating-point source/destination register (MR0 to MR3) |
MRb | CLA floating-point source register (MR0 to MR3) |
LSW: 0000 0000 0000 bbaa
MSW: 0111 1101 0010 0000
if(MRa < MRb) MRa = MRb;
Special cases for the output from the MMAXF32 operation:
This instruction modifies the following flags in the MSTF register:
Flag | TF | ZF | NF | LUF | LVF |
---|---|---|---|---|---|
Modified | No | Yes | Yes | No | No |
The ZF and NF flags are configured on the result of the operation, not the result stored in the destination register.
if(MRa == MRb) {ZF=1; NF=0;}
if(MRa > MRb) {ZF=0; NF=0;}
if(MRa < MRb) {ZF=0; NF=1;}
This is a single-cycle instruction.
MMOVIZ MR0, #5.0 ; MR0 = 5.0 (0x40A00000)
MMOVIZ MR1, #-2.0 ; MR1 = -2.0 (0xC0000000)
MMOVIZ MR2, #-1.5 ; MR2 = -1.5 (0xBFC00000)
MMAXF32 MR2, MR1 ; MR2 = -1.5, ZF = NF = 0
MMAXF32 MR1, MR2 ; MR1 = -1.5, ZF = 0, NF = 1
MMAXF32 MR2, MR0 ; MR2 = 5.0, ZF = 0, NF = 1
MAXF32 MR0, MR2 ; MR2 = 5.0, ZF = 1, NF = 0
; 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 ; Decrememt 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