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3-328 Vol. 2A FILD—Load Integer
INSTRUCTION SET REFERENCE, A-M
FILD—Load Integer
Description
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.
Opcode Instruction 64-Bit
Mode
Compat/
Leg Mode
Description
DF /0 FILD m16int Valid Valid Push m16int onto the FPU register
stack.
DB /0 FILD m32int Valid Valid Push m32int onto the FPU register
stack.
DF /5 FILD m64int Valid Valid Push m64int onto the FPU register
stack.