Converts the signed-integer source operand into double extended-precision floating-point format and pushes the value onto the FPU register stack. The source operand can be a word, doubleword, or quadword integer. It is loaded without rounding errors. The sign of the source operand is preserved.
This instruction’s operation is the same in non-64-bit modes and 64-bit mode.
Operation
TOP := TOP − 1;
ST(0) := ConvertToDoubleExtendedPrecisionFP(SRC);
FPU Flags Affected
C1
Set to 1 if stack overflow occurred; set to 0 otherwise.
C0, C2, C3
Undefined.
Floating-Point Exceptions
#IS
Stack overflow occurred.
Protected Mode Exceptions
#GP(0)
If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.
If the DS, ES, FS, or GS register contains a NULL segment selector.
#SS(0)
If a memory operand effective address is outside the SS segment limit.
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#PF(fault-code)
If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD
If the LOCK prefix is used.
Real-Address Mode Exceptions
#GP
If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.
#SS
If a memory operand effective address is outside the SS segment limit.
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#UD
If the LOCK prefix is used.
Virtual-8086 Mode Exceptions
#GP(0)
If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.
#SS(0)
If a memory operand effective address is outside the SS segment limit.
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#PF(fault-code)
If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is made.
#UD
If the LOCK prefix is used.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
#SS(0)
If a memory address referencing the SS segment is in a non-canonical form.
#GP(0)
If the memory address is in a non-canonical form.
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#MF
If there is a pending x87 FPU exception.
#PF(fault-code)
If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD
If the LOCK prefix is used.
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be
incomplete or broken in various obvious or non-obvious
ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.