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Multiply Two Double-Precision Floating-Point Values MPYDP
3-145 Instruction SetSPRU733
Multiply Two Double-Precision Floating-Point Values
MPYDP
Syntax MPYDP (.unit) src1, src2, dst
.unit = .M1 or .M2
Compatibility C67x and C67x+ CPU
Opcode
31 292827 2322 1817 131211 76543210
creg z dst src2 src1 x 0 1 1 1 0 0 0 0 0 0 s p
3 1 5 5 5 1 1 1
Opcode map field used... For operand type... Unit
src1
src2
dst
dp
dp
dp
.M1, .M2
Description The src1 operand is multiplied by the src2 operand. The result is placed in dst.
Execution if (cond) src1 src2 → dst
else nop
Notes:
1) If one source is SNaN or QNaN, the result is a signed NaN_out. If either
source is SNaN, the INVAL bit is set also. The sign of NaN_out is the
exclusive-OR of the input signs.
2) Signed infinity multiplied by signed infinity or a normalized number (other
than signed 0) returns signed infinity. Signed infinity multiplied by
signed 0 returns a signed NaN_out and sets the INVAL bit.
3) If one or both sources are signed 0, the result is signed 0 unless the other
source is NaN or signed infinity, in which case the result is signed
NaN_out.
4) A denormalized source is treated as signed 0 and the DENn bit is set.
The INEX bit is set except when the other source is signed infinity, signed
NaN, or signed 0. Therefore, a signed infinity multiplied by a denormal-
ized number gives a signed NaN_out and sets the INVAL bit.
5) If rounding is performed, the INEX bit is set.