Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1808

CVTTSS2SI: Scalar Single-FP to signed INT32 Conversion (truncate)
Opcode
F3,0F,2C,/r
Operation: r32 = (int) (xmm/m32[31-0]);
The CVTTSS2SI instruction converts a SP FP number to a signed 32-bit integer and
Description:
returns it in the 32-bit integer register; if the conversion is inexact, the truncated result
is returned. If the converted result is larger than the maximum signed 32 bit value, the
Integer Indefinite value (0x80000000) will be returned.
None.
FP Exceptions:
Invalid, Precision.
Numeric Exceptions:
Protected Mode Exceptions:
#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; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set; #AC for unaligned memory
reference. To enable #AC exceptions, three conditions must be true(CR0.AM is set;
EFLAGS.AC is set; current CPL is 3; #XM for an unmasked SSE numeric exception
(CR4.OSXMMEXCPT =1); #UD for an unmasked SSE numeric exception
(CR4.OSXMMEXCPT =0); #UD if CRCR4.OSFXSR(bit 9) = 0; #UD if CPUID.XMM(EDX
bit 25) = 0.
Real Address Mode Exceptions:
Interrupt 13 if any part of the operand would lie outside of the effective address space
from 0 to 0FFFFH; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set; #XM for an
unmasked SSE numeric exception (CR4.OSXMMEXCPT =1); #UD for an unmasked SSE
numeric exception (CR4.OSXMMEXCPT =0); #UD if CRCR4.OSFXSR(bit 9) = 0; #UD if
CPUID.XMM(EDX bit 25) = 0.
Virtual 8086 Mode Exceptions:
Same exceptions as in Real Address Mode; #AC for unaligned memory reference if the
current privilege level is 3; #PF (fault-code) for a page fault.
Additional Itanium System Environment Exceptions
Itanium Reg Faults
Itanium Mem Faults VHPT Data Fault, Data TLB Fault, Alternate Data TLB Fault, Data
4:506
Instruction
CVTTSS2SI r32, xmm/m32
Disabled FP Register Fault if PSR.dfl is 1, NaT Register
Consumption Fault
Page Not Present Fault, Data NaT Page Consumption Abort, Data
Key Miss Fault, Data Key Permission Fault, Data Access Rights
Fault, Data Access Bit Fault
Description
Convert lowest SP FP from XMM/Mem to one 32 bit signed
integer using truncate, and move the result to an integer
register.
Volume 4: IA-32 SSE Instruction Reference