x86 Instruction Set Reference

CVTTSD2SI

Convert with Truncation Scalar Double-Precision Floating-Point Value to Signed Doubleword Integer

Opcode Mnemonic Description
F2 0F 2C /r CVTTSD2SI r32, xmm/m64 Convert one double-precision floating-point value from xmm/m64 to one signed doubleword integer in r32 using truncation.
Description

Converts a double-precision floating-point value in the source operand (second operand) to a signed doubleword integer in the destination operand (first operand). The source operand can be an XMM register or a 64-bit memory location. The destination operand is a general-purpose register. When the source operand is an XMM register, the double-precision floating-point value is contained in the low quadword of the 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] = ConvertDoubleToIntegerTruncate(Source[0..63]);
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.
#GP(0)For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments.
#SS(0)For an illegal address in the SS segment.
#PF(fault-code)For a page fault.
#NMIf TS in CR0 is set.
#XMIf an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 1.
#UDIf an unmasked SIMD floating-point exception and OSXMMEXCPT in CR4 is 0. If EM in CR0 is set. If OSFXSR in CR4 is 0. If CPUID feature flag SSE2 is 0.
Real-Address Mode Exceptions
#GP(0)If any part of the operand lies outside the effective address space from 0 to FFFFH.
#GP(0)If any part of the operand lies outside the effective address space from 0 to FFFFH.
#NMIf TS in CR0 is set.
#XMIf 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.
#PF(fault-code)For a page fault.
Instruction Latency Throughput Execution Unit
CPUID0F3n/0F2n0F3n/0F2n0F2n
CVTTSD2SI r32, xmm8/82/2FP_ADD FP_MISC