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SQRTPD—Square Root of Double-Precision Floating-Point Values

Opcode/Instruction Op /En 64/32 bit Mode Support CPUID Feature Flag Description

66 0F 51 /r

SQRTPD xmm1, xmm2/m128

 RM 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

 RM 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

 RM 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/m32bcst

 FV V/V AVX512VL AVX512F 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/m32bcst

 FV V/V AVX512VL AVX512F 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}

 FV V/V AVX512F 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 Operand 1 Operand 2 Operand 3 Operand 4
RM ModRM:reg (w) ModRM:r/m (r) NA NA
FV ModRM:reg (w) ModRM:r/m (r) NA NA

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 (MAX_VL-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 destina-tion operand is an XMM register. The upper bits (MAX_VL-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 destina-tion is not distinct from the first source XMM register and the upper bits (MAX_VL-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_RM(EVEX.RC);
    ELSE
    SET_RM(MXCSR.RM);
FI;
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j * 64
    IF k1[j] OR *no writemask* THEN
        IF (EVEX.b = 1) AND (SRC *is memory*)
            THEN DEST[i+63:i] (cid:197) SQRT(SRC[63:0])
            ELSE DEST[i+63:i] (cid:197) 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] (cid:197) 0
        FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0


VSQRTPD (VEX.256 encoded version)

DEST[63:0] (cid:197)SQRT(SRC[63:0])
DEST[127:64] (cid:197)SQRT(SRC[127:64])
DEST[191:128] (cid:197)SQRT(SRC[191:128])
DEST[255:192] (cid:197)SQRT(SRC[255:192])
DEST[MAX_VL-1:256] (cid:197) 0
. VSQRTPD (VEX.128 encoded version)
DEST[63:0] (cid:197)SQRT(SRC[63:0])
DEST[127:64] (cid:197)SQRT(SRC[127:64])
DEST[MAX_VL-1:128] (cid:197)0


SQRTPD (128-bit Legacy SSE version)

DEST[63:0] (cid:197)SQRT(SRC[63:0])
DEST[127:64] (cid:197)SQRT(SRC[127:64])
DEST[MAX_VL-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);



SIMD Floating-Point Exceptions


Invalid, Precision, Denormal


Other Exceptions


Non-EVEX-encoded instruction, see Exceptions Type 2; additionally





#UD


If VEX.vvvv != 1111B.


EVEX-encoded instruction, see Exceptions Type E2.



#UD
If EVEX.vvvv != 1111B.