sqrtpd
Square Root Packed Double-Precision
Computes square root of two 64-bit doubles.
Pseudocode Operation
dest[0:63] ← sqrt(src[0:63])
dest[64:127] ← sqrt(src[64:127])
MXCSR exception flags ← updated based on IEEE 754 resultExample
Encoding
Operands
-
dest
128-bit SSE/AVX register (XMM) -
src
128-bit XMM register or 128-bit memory
Related
More in SSE2
Reference
Instruction Forms
| Opcode | Instruction | Op/En | 64/32-bit Mode | CPUID | Description |
|---|---|---|---|---|---|
| 66 0F 51 /r | SQRTPD xmm1, xmm2/m128 | A | V/V | SSE2 | Computes Square Roots of the packed double precision floating-point values in xmm2/m128 and stores the result in xmm1. |
| VEX.128.66.0F.WIG 51 /r | VSQRTPD xmm1, xmm2/m128 | A | V/V | AVX | Computes Square Roots of the packed double precision floating-point values in xmm2/m128 and stores the result in xmm1. |
| VEX.256.66.0F.WIG 51 /r | VSQRTPD ymm1, ymm2/m256 | A | V/V | AVX | Computes Square Roots of the packed double precision floating-point values in ymm2/m256 and stores the result in ymm1. |
| EVEX.128.66.0F.W1 51 /r | VSQRTPD xmm1 {k1}{z}, xmm2/m128/m64bcst | B | V/V | (AVX512VL AND AVX512F) OR AVX10.1 | Computes Square Roots of the packed double precision floating-point values in xmm2/m128/m64bcst and stores the result in xmm1 subject to writemask k1. |
| EVEX.256.66.0F.W1 51 /r | VSQRTPD ymm1 {k1}{z}, ymm2/m256/m64bcst | B | V/V | (AVX512VL AND AVX512F) OR AVX10.1 | Computes Square Roots of the packed double precision floating-point values in ymm2/m256/m64bcst and stores the result in ymm1 subject to writemask k1. |
| EVEX.512.66.0F.W1 51 /r | VSQRTPD zmm1 {k1}{z}, zmm2/m512/m64bcst{er} | B | V/V | AVX512F OR AVX10.1 | Computes Square Roots of the packed double precision floating-point values in zmm2/m512/m64bcst and stores the result in zmm1 subject to writemask k1. |
Instruction Operand Encoding
| Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|---|
| A | N/A | ModRM:reg (w) | ModRM:r/m (r) | N/A | N/A |
| B | Full | ModRM:reg (w) | ModRM:r/m (r) | N/A | N/A |
Description
Performs a SIMD computation of the square roots of the two, four or eight packed double precision floating-point values in the source operand (the second operand) stores the packed double precision floating-point results in the destination operand (the first operand). EVEX encoded versions: The source operand is a ZMM/YMM/XMM register, a 512/256/128-bit memory location, or a 512/256/128-bit vector broadcasted from a 64-bit memory location. The destination operand is a ZMM/YMM/XMM register updated according to the writemask. VEX.256 encoded version: The source operand is a YMM register or a 256-bit memory location. The destination operand is a YMM register. The upper bits (MAXVL-1:256) of the corresponding ZMM register destination are zeroed. VEX.128 encoded version: the source operand second source operand or a 128-bit memory location. The destination operand is an XMM register. The upper bits (MAXVL-1:128) of the corresponding ZMM register destination are zeroed. 128-bit Legacy SSE version: The second source can be an XMM register or 128-bit memory location. The destination is not distinct from the first source XMM register and the upper bits (MAXVL-1:128) of the corresponding ZMM register destination are unmodified. Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instructions will #UD.
Operation
VSQRTPD (EVEX Encoded Versions) (KL, VL) = (2, 128), (4, 256), (8, 512) IF (VL = 512) AND (EVEX.b = 1) AND (SRC *is register*) THEN SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC); ELSE SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC); FI; FOR j := 0 TO KL-1 i := j * 64 IF k1[j] OR *no writemask* THEN IF (EVEX.b = 1) AND (SRC *is memory*) THEN DEST[i+63:i] := SQRT(SRC[63:0]) ELSE DEST[i+63:i] := SQRT(SRC[i+63:i]) FI; ELSE IF *merging-masking* ; merging-masking THEN *DEST[i+63:i] remains unchanged* ELSE ; zeroing-masking DEST[i+63:i] := 0 FI FI; ENDFOR DEST[MAXVL-1:VL] := 0 VSQRTPD (VEX.256 Encoded Version) DEST[63:0] := SQRT(SRC[63:0]) DEST[127:64] := SQRT(SRC[127:64]) DEST[191:128] := SQRT(SRC[191:128]) DEST[255:192] := SQRT(SRC[255:192]) DEST[MAXVL-1:256] := 0 . VSQRTPD (VEX.128 Encoded Version) DEST[63:0] := SQRT(SRC[63:0]) DEST[127:64] := SQRT(SRC[127:64]) DEST[MAXVL-1:128] := 0 SQRTPD (128-bit Legacy SSE Version) DEST[63:0] := SQRT(SRC[63:0]) DEST[127:64] := SQRT(SRC[127:64]) DEST[MAXVL-1:128] (Unmodified)
Intel C/C++ Compiler Intrinsic Equivalent
VSQRTPD __m512d _mm512_sqrt_round_pd(__m512d a, int r); VSQRTPD __m512d _mm512_mask_sqrt_round_pd(__m512d s, __mmask8 k, __m512d a, int r); VSQRTPD __m512d _mm512_maskz_sqrt_round_pd( __mmask8 k, __m512d a, int r); VSQRTPD __m256d _mm256_sqrt_pd (__m256d a); VSQRTPD __m256d _mm256_mask_sqrt_pd(__m256d s, __mmask8 k, __m256d a, int r); VSQRTPD __m256d _mm256_maskz_sqrt_pd( __mmask8 k, __m256d a, int r); SQRTPD __m128d _mm_sqrt_pd (__m128d a); VSQRTPD __m128d _mm_mask_sqrt_pd(__m128d s, __mmask8 k, __m128d a, int r); VSQRTPD __m128d _mm_maskz_sqrt_pd( __mmask8 k, __m128d a, int r);