Opcode/ Instruction |
Op/ En |
64-Bit Mode |
Compat/ Leg Mode |
Description |
|
66 0F 2C /r CVTTPD2PI mm, xmm/m128 |
RM |
Valid |
Valid |
Convert two packer double precision floating- point values from xmm/m128 to two packed signed doubleword integers in mm using truncation. |
Op/En |
Operand 1 |
Operand 2 |
Operand 3 |
Operand 4 |
|
RM |
ModRM:reg (w) |
ModRM:r/m (r) |
N/A |
N/A |
Converts two packed double precision floating-point values in the source operand (second operand) to two 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 MMX technology 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.
This instruction causes a transition from x87 FPU to MMX technology operation (that is, the x87 FPU top-of-stack pointer is set to 0 and the x87 FPU tag word is set to all 0s [valid]). If this instruction is executed while an x87 FPU floating-point exception is pending, the exception is handled before the CVTTPD2PI instruction is executed.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).
DEST[31:0] := Convert_Double_Precision_Floating_Point_To_Integer32_Truncate(SRC[63:0]); DEST[63:32] := Convert_Double_Precision_Floating_Point_To_Integer32_Truncate(SRC[127:64]);
CVTTPD1PI __m64 _mm_cvttpd_pi32(__m128d a)
Invalid, Precision.
|
See Table 23-4, "Exception Conditions for Legacy SIMD/MMX Instructions with FP Exception and 16-Byte Align- |
ment," in the Intel® 64 and IA-32 Architectures Software Developer's Manual, Volume 3B. |