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FLD1

Pushes the floating-point constant 1.0 onto the top of the floating-point register stack.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available in 64-bit mode, compatibility mode, and 32-bit mode. It operates exclusively on the x87 floating-point register stack.

The instruction increments the floating-point stack pointer (TOP). If the stack pointer is at the maximum value (7), this instruction SHALL trigger a stack overflow exception. The value 1.0 is loaded as an 80-bit extended precision floating-point number.