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Subtract Two Single-Precision Floating-Point Values SUBSP
3-263 Instruction SetSPRU733
Subtract Two Single-Precision Floating-Point Values
SUBSP
Syntax SUBSP (.unit) src1, src2, dst (C67x and C67x+ CPU)
.unit = .L1 or .L2
or
SUBSP (.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
sp
xsp
sp
.L1, .L2 001 0001
src1
src2
dst
xsp
sp
sp
.L1, .L2 001 0101
src1
src2
dst
sp
xsp
sp
.S1, .S2 111 0001
src1
src2
dst
sp
xsp
sp
.S1, .S2 111 0101
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