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SUBDP Subtract Two Double-Precision Floating-Point Values
3-260 Instruction Set SPRU733
Subtract Two Double-Precision Floating-Point Values
SUBDP
Syntax SUBDP (.unit) src1, src2, dst (C67x and C67x+ CPU)
.unit = .L1 or .L2
or
SUBDP (.unit) src1, src2, dst (C67x+ CPU only)
.unit = .S1 or .S2
Compatibility C67x and C67x+ CPU
Opcode
31 29 28 27 23 22 18 17 13 12 11 5 4 3 2 1 0
creg z dst src2 src1 x op 1 1 0 s p
3 1 5 5 5 1 7 1 1
Opcode map field used... For operand type... Unit Opfield
src1
src2
dst
dp
xdp
dp
.L1, .L2 001 1001
src1
src2
dst
xdp
dp
dp
.L1, .L2 001 1101
src1
src2
dst
dp
xdp
dp
.S1, .S2 111 0011
src1
src2
dst
dp
xdp
dp
.S1, .S2 111 0111
src2 − src1
Note:
The assembly syntax allows a cross-path operand to be used for either src1
or src2. The assembler selects between the two opcodes based on which
source operand in the assembly instruction requires the cross path. If src1
requires the cross path, the assembler chooses the second (reverse) form
of the instruction syntax and reverses the order of the operands in the
encoded instruction.
Description src2 is subtracted from src1. The result is placed in dst.
Execution if (cond) src1 − src2 → dst
else nop