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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 Exception Real Virtual 8086 Protected Cause of Exception Overflow exception (OE) X X X A rounded result was too large to fit into the format of the destination operand. Underflow exception (UE) X X X A rounded result was too small to fit into the format of the destination operand. Denormalized-operand X X X A source operand was a denormal value. exception (DE) Zero-divide exception (ZE) X X X A non-zero number was divided by zero. Precision exception (PE) X X X A result could not be represented exactly in the destination format. 112 DIVSS
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology FXRSTOR Restore XMM, MMX, and x87 State Restores the XMM, MMX, and x87 state. The data loaded from memory is the state information previously saved using the FXSAVE instruction. Restoring data with FXRSTOR that had been previously saved with an FSAVE (rather than FXSAVE) instruction results in an incorrect restoration. If FXRSTOR results in set exception flags in the loaded x87 status word register, and these exceptions are unmasked in the x87 control word register, a floating-point exception occurs when the next floating-point instruction is executed (except for the no-wait floating-point instructions). If the restored MXCSR register contains a set bit in an exception status flag, and the corresponding exception mask bit is cleared (indicating an unmasked exception), loading the MXCSR register from memory does not cause a SIMD floating-point exception (#XF). FXRSTOR does not restore the x87 error pointers (last instruction pointer, last data pointer, and last opcode), except in the relatively rare cases in which the exceptionsummary (ES) bit in the x87 status word is set to 1, indicating that an unmasked x87 exception has occurred. The architecture supports two memory formats for FXRSTOR, a 512-byte 32-bit legacy format and a 512-byte 64-bit format. Selection of the 32-bit or 64-bit format is accomplished by using the corresponding effective operand size in the FXRSTOR instruction. If software running in 64-bit mode executes an FXRSTOR with a 32-bit operand size (no REX-prefix operand-size override), the 32-bit legacy format is used. If software running in 64-bit mode executes an FXRSTOR with a 64-bit operand size (requires REX-prefix operand-size override), the 64-bit format is used. For details about the memory image restored by FXRSTOR, see “Saving Media and x87 Processor State” in Volume 2. If the operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 is cleared to 0, the saved image of XMM0–XMM7 and MXCSR is not loaded into the processor. A general-protection exception occurs if there is an attempt to load a non-zero value to the bits in MXCSR that are defined as reserved (bits 31–16). . Mnemonic Opcode Description FXRSTOR mem512env 0F AE /1 Restores XMM, MMX, and x87 state from 512-byte memory location. FXRSTOR 113
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