CVTTPD2DQ—Convert with Truncation Packed Double-Precision FP Values to Packed Dword Integers
| Opcode/Instruction |
Op/En |
64/32-bit Mode |
CPUID Feature Flag |
Description |
| 66 0F E6 /r CVTTPD2DQ xmm1, xmm2/m128 |
RM |
V/V |
SSE2 |
Convert two packed double-precision floatingpoint values from xmm2/m128 to two packed signed doubleword integers in xmm1 using truncation. |
| VEX.128.66.0F.WIG E6 /r VCVTTPD2DQ xmm1, xmm2/m128 |
RM |
V/V |
AVX |
Convert two packed double-precision floatingpoint values in xmm2/mem to two signed doubleword integers in xmm1 using truncation. |
| VEX.256.66.0F.WIG E6 /r VCVTTPD2DQ xmm1, ymm2/m256 |
RM |
V/V |
AVX |
Convert four packed double-precision floatingpoint values in ymm2/mem to four signed doubleword integers in xmm1 using truncation. |
Instruction Operand Encoding
| Op/En |
Operand 1 |
Operand 2 |
Operand 3 |
Operand 4 |
| RM |
ModRM:reg (w) |
ModRM:r/m (r) |
NA |
NA |
Description
Converts two or four packed double-precision floating-point values in the source operand (second operand) to two or four packed signed doubleword integers in the destination operand (first operand). When a conversion is inexact, a truncated (round toward zero) value 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.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15). 128-bit Legacy SSE version: The source operand is an XMM register or 128- bit memory location. The destination operation is an XMM register. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified. VEX.128 encoded version: The source operand is an XMM register or 128- bit memory location. The destination operation is a YMM register. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are zeroed. VEX.256 encoded version: The source operand is a YMM register or 256- bit memory location. The destination operation is an XMM register. The upper bits (255:128) of the corresponding YMM register destination are zeroed. Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.
| SRC DEST |
X3 Figure 3-14. |
X2 0 VCVTTPD2DQ (VEX.256 encoded version) |
X1 X2 |
X0 X0 |
Operation
CVTTPD2DQ (128-bit Legacy SSE version)
DEST[31:0] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[127:64])
DEST[127:64] ← 0
DEST[VLMAX-1:128] (unmodified)
VCVTTPD2DQ (VEX.128 encoded version)
DEST[31:0] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[127:64])
DEST[VLMAX-1:64] ← 0
VCVTTPD2DQ (VEX.256 encoded version)
DEST[31:0] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[127:64])
DEST[95:64] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[191:128])
DEST[127:96] ← Convert_Double_Precision_Floating_Point_To_Integer_Truncate(SRC[255:192)
DEST[255:128]← 0
Intel C/C++ Compiler Intrinsic Equivalent
| CVTTPD2DQ: |
__m128i _mm_cvttpd_epi32(__m128d a) |
| VCVTTPD2DQ: |
__m128i _mm256_cvttpd_epi32 (__m256d src) |
SIMD Floating-Point Exceptions
Invalid, Precision.
Other Exceptions
See Exceptions Type 2; additionally
| #UD |
If VEX.vvvv != 1111B. |