# SUBSD
# Subtract Scalar Double-Precision Floating-Point Values
| Opcode | Mnemonic | Description |
|---|---|---|
| F2 0F 5C /r | SUBSD xmm1, xmm2/m64 | Subtract the low double-precision floating-point value in xmm2/mem64 from xmm1. |
# Description
Subtracts the low double-precision floating-point value in the source operand (second operand) from the low double-precision floating-point value in the destination operand (first operand), and stores the double-precision floating-point result in the destination operand. The source operand can be an XMM register or a 64-bit memory location. The destination operand is an XMM register. The high quadword of the destination operand remains unchanged. See Figure 11-4 in the IA-32 Intel Architecture Software Developer's Manual, Volume 1 for an illustration of a scalar double-precision floating-point operation.
# Operation
Destination[0..63] = Destination[0..63] - Source[0..63];
//Destination[64..127] remains unchanged
1
2
3
2
3
| Instruction | Latency | Throughput | Execution Unit |
|---|---|---|---|
| CPUID | 0F3n/0F2n/069n | 0F3n/0F2n/069n | 0F2n |
| SUBSD xmm, xmm | 5/4/3 | 2/2/1 | FP_ADD |