SUBPD—Subtract Packed Double-Precision Floating-Point Values

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description
66 0F 5C /r SUBPD xmm1, xmm2/m128 A V/V SSE2 Subtract packed double-precision floating-point values in xmm2/mem from xmm1 and store result in xmm1.
VEX.128.66.0F.WIG 5C /r VSUBPD xmm1,xmm2, xmm3/m128 B V/V AVX Subtract packed double-precision floating-point values in xmm3/mem from xmm2 and store result in xmm1.
VEX.256.66.0F.WIG 5C /r VSUBPD ymm1, ymm2, ymm3/m256 B V/V AVX Subtract packed double-precision floating-point values in ymm3/mem from ymm2 and store result in ymm1.
EVEX.128.66.0F.W1 5C /r VSUBPD xmm1 {k1}{z}, xmm2, xmm3/m128/m64bcst C V/V AVX512VL AVX512F Subtract packed double-precision floating-point values from xmm3/m128/m64bcst to xmm2 and store result in xmm1 with writemask k1.
EVEX.256.66.0F.W1 5C /r VSUBPD ymm1 {k1}{z}, ymm2, ymm3/m256/m64bcst C V/V AVX512VL AVX512F Subtract packed double-precision floating-point values from ymm3/m256/m64bcst to ymm2 and store result in ymm1 with writemask k1.
EVEX.512.66.0F.W1 5C /r VSUBPD zmm1 {k1}{z}, zmm2, zmm3/m512/m64bcst{er} C V/V AVX512F Subtract packed double-precision floating-point values from zmm3/m512/m64bcst to zmm2 and store result in zmm1 with writemask k1.

Instruction Operand Encoding

Op/En Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A NA ModRM:reg (r, w) ModRM:r/m (r) NA NA
B NA ModRM:reg (w) VEX.vvvv (r) ModRM:r/m (r) NA
C Full ModRM:reg (w) EVEX.vvvv (r) ModRM:r/m (r) NA

Description

Performs a SIMD subtract of the two, four or eight packed double-precision floating-point values of the second Source operand from the first Source operand, and stores the packed double-precision floating-point results in the destination operand.

VEX.128 and EVEX.128 encoded versions: The second source operand is an XMM register or an 128-bit memory location. The first source operand and destination operands are XMM registers. Bits (MAXVL-1:128) of the corre-sponding destination register are zeroed.

VEX.256 and EVEX.256 encoded versions: The second source operand is an YMM register or an 256-bit memory location. The first source operand and destination operands are YMM registers. Bits (MAXVL-1:256) of the corre-sponding destination register are zeroed.

EVEX.512 encoded version: The second source operand is a ZMM register, a 512-bit memory location or a 512-bit vector broadcasted from a 64-bit memory location. The first source operand and destination operands are ZMM registers. The destination operand is conditionally updated according to the writemask.

128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The desti-nation is not distinct from the first source XMM register and the upper Bits (MAXVL-1:128) of the corresponding register destination are unmodified.

Operation

VSUBPD (EVEX encoded versions) when src2 operand is a vector register

(KL, VL) = (2, 128), (4, 256), (8, 512)

IF (VL = 512) AND (EVEX.b = 1)

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 DEST[i+63:i] := SRC1[i+63:i] - SRC2[i+63:i]

ELSE

IF *merging-masking*

; merging-masking

THEN *DEST[63:0] remains unchanged*

ELSE

; zeroing-masking

DEST[63:0] := 0

FI;

FI;

ENDFOR

DEST[MAXVL-1:VL] := 0

VSUBPD (EVEX encoded versions) when src2 operand is a memory source

(KL, VL) = (2, 128), (4, 256), (8, 512)

FOR j := 0 TO KL-1

i := j * 64

IF k1[j] OR *no writemask* THEN

IF (EVEX.b = 1)

THEN

DEST[i+63:i] := SRC1[i+63:i] - SRC2[63:0];

ELSE

EST[i+63:i] := SRC1[i+63:i] - SRC2[i+63:i];

FI;

ELSE

IF *merging-masking*

; merging-masking

THEN *DEST[63:0] remains unchanged*

ELSE

; zeroing-masking

DEST[63:0] := 0

FI;

FI;

ENDFOR

DEST[MAXVL-1:VL] := 0

VSUBPD (VEX.256 encoded version)

DEST[63:0] := SRC1[63:0] - SRC2[63:0]

DEST[127:64] := SRC1[127:64] - SRC2[127:64]

DEST[191:128] := SRC1[191:128] - SRC2[191:128]

DEST[255:192] := SRC1[255:192] - SRC2[255:192]

DEST[MAXVL-1:256] := 0

VSUBPD (VEX.128 encoded version)

DEST[63:0] := SRC1[63:0] - SRC2[63:0]

DEST[127:64] := SRC1[127:64] - SRC2[127:64]

DEST[MAXVL-1:128] := 0

SUBPD (128-bit Legacy SSE version)

DEST[63:0] := DEST[63:0] - SRC[63:0]

DEST[127:64] := DEST[127:64] - SRC[127:64]

DEST[MAXVL-1:128] (Unmodified)

Intel C/C++ Compiler Intrinsic Equivalent

VSUBPD __m512d _mm512_sub_pd (__m512d a, __m512d b);

VSUBPD __m512d _mm512_mask_sub_pd (__m512d s, __mmask8 k, __m512d a, __m512d b);

VSUBPD __m512d _mm512_maskz_sub_pd (__mmask8 k, __m512d a, __m512d b);

VSUBPD __m512d _mm512_sub_round_pd (__m512d a, __m512d b, int);

VSUBPD __m512d _mm512_mask_sub_round_pd (__m512d s, __mmask8 k, __m512d a, __m512d b, int);

VSUBPD __m512d _mm512_maskz_sub_round_pd (__mmask8 k, __m512d a, __m512d b, int);

VSUBPD __m256d _mm256_sub_pd (__m256d a, __m256d b);

VSUBPD __m256d _mm256_mask_sub_pd (__m256d s, __mmask8 k, __m256d a, __m256d b);

VSUBPD __m256d _mm256_maskz_sub_pd (__mmask8 k, __m256d a, __m256d b);

SUBPD __m128d _mm_sub_pd (__m128d a, __m128d b);

VSUBPD __m128d _mm_mask_sub_pd (__m128d s, __mmask8 k, __m128d a, __m128d b);

VSUBPD __m128d _mm_maskz_sub_pd (__mmask8 k, __m128d a, __m128d b);

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal

Other Exceptions

VEX-encoded instructions, see Table 2-19, “Type 2 Class Exception Conditions”.
EVEX-encoded instructions, see Table 2-46, “Type E2 Class Exception Conditions”.