x86 Instruction Set Reference

CVTTPS2DQ

Convert with Truncation Packed Single-Precision Floating-Point Values to Packed Doubleword Integers

Opcode	Mnemonic	Description
`F3 0F 5B /r`	`CVTTPS2DQ xmm1, xmm2/m128`	Convert four single-precision floating-point values from xmm2/m128 to four signed doubleword integers in xmm1 using truncation.

Description
Converts four packed single-precision floating-point values in the source operand (second operand) to four packed signed doubleword integers in the destination operand (first operand). The source operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register. When a conversion is inexact, a truncated (round toward zero) result is returned. If a converted result is larger than the maximum signed doubleword integer, the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.

Description

Converts four packed single-precision floating-point values in the source operand (second operand) to four packed signed doubleword integers in the destination operand (first operand). The source operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register. When a conversion is inexact, a truncated (round toward zero) result is returned. If a converted result is larger than the maximum signed doubleword integer, the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.

Operation
Destination[0..31] = ConvertFloatToIntegerTruncate(Source[0..31]); Destination[32..63] = ConvertFloatToIntegerTruncate(Source[32..63]); Destination[64..95] = ConvertFloatToIntegerTruncate(Source[64..95]); Destination[96..127] = ConvertFloatToIntegerTruncate(Source[96..127]);

Operation

Destination[0..31] = ConvertFloatToIntegerTruncate(Source[0..31]);
Destination[32..63] = ConvertFloatToIntegerTruncate(Source[32..63]);
Destination[64..95] = ConvertFloatToIntegerTruncate(Source[64..95]);
Destination[96..127] = ConvertFloatToIntegerTruncate(Source[96..127]);

SIMD Floating-Point Exceptions
Invalid, Precision.

Protected Mode Exceptions

`#GP(0)`	For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
`#GP(0)`	For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
`#SS(0)`	For an illegal address in the SS segment.
`#PF(fault-code)`	For a page fault.
`#NM`	If TS in CR0 is set.
`#XM`	If an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 1.

Real-Address Mode Exceptions

`#GP(0)`	If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
`#GP(0)`	If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
`#NM`	If TS in CR0 is set.
`#XM`	If an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 1.

Virtual-8086 Mode Exceptions

Same exceptions as in Real Address Mode

#PF(fault-code) For a page fault.

Instruction	Latency	Throughput	Execution Unit
`CPUID`	0F3n/0F2n/069n	0F3n/0F2n/069n	0F2n
`CVTTPS2DQ xmm, xmm`	5/5/3+1	2/2/2	FP_ADD