image/svg+xml SUBSD—Subtract Scalar Double-Precision Floating-Point Value Instruction Operand Encoding Description Subtract the low double-precision floating-point value in the second source operand from the first source operand and stores the double-precision floating-point result in the low quadword of the destination operand. The second source operand can be an XMM register or a 64-bit memory location. The first source and destination operands are XMM registers. 128-bit Legacy SSE version: The destination and first source operand are the same. Bits (MAXVL-1:64) of the corresponding destination register remain unchanged. VEX.128 and EVEX encoded versions: Bits (127:64) of the XMM register destination are copied from corresponding bits in the first source operand. Bits (MAXVL-1:128) of the destination register are zeroed. EVEX encoded version: The low quadword element of the destination operand is updated according to the writemask. Software should ensure VSUBSD is encoded with VEX.L=0. Encoding VSUBSD with VEX.L=1 may encounter unpre- dictable behavior across different processor generations. Opcode/ Instruction Op / En 64/32 bit Mode Support CPUID Feature Flag Description F2 0F 5C /r SUBSD xmm1, xmm2/m64 AV/VSSE2Subtract the low double-precision floating-point value in xmm2/m64 from xmm1 and store the result in xmm1. VEX.LIG.F2.0F.WIG 5C /r VSUBSD xmm1,xmm2, xmm3/m64 BV/VAVXSubtract the low double-precision floating-point value in xmm3/m64 from xmm2 and store the result in xmm1. EVEX.LLIG.F2.0F.W1 5C /r VSUBSD xmm1 {k1}{z}, xmm2, xmm3/m64{er} CV/VAVX512FSubtract the low double-precision floating-point value in xmm3/m64 from xmm2 and store the result in xmm1 under writemask k1. Op/EnTuple TypeOperand 1Operand 2Operand 3Operand 4 ANAModRM:reg (r, w)ModRM:r/m (r)NANA BNAModRM:reg (w)VEX.vvvv (r)ModRM:r/m (r)NA CTuple1 ScalarModRM:reg (w)EVEX.vvvv (r)ModRM:r/m (r)NA image/svg+xml Operation VSUBSD (EVEX encoded version) IF (SRC2 *is register*) AND (EVEX.b = 1) THEN SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC); ELSE SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC); FI; IF k1[0] or *no writemask* THENDEST[63:0] := SRC1[63:0] - SRC2[63:0] ELSE IF *merging-masking*; merging-masking THEN *DEST[63:0] remains unchanged* ELSE ; zeroing-masking THEN DEST[63:0] := 0 FI; FI; DEST[127:64] := SRC1[127:64] DEST[MAXVL-1:128] := 0 VSUBSD (VEX.128 encoded version) DEST[63:0] := SRC1[63:0] - SRC2[63:0] DEST[127:64] := SRC1[127:64] DEST[MAXVL-1:128] := 0 SUBSD (128-bit Legacy SSE version) DEST[63:0] := DEST[63:0] - SRC[63:0] DEST[MAXVL-1:64] (Unmodified) Intel C/C++ Compiler Intrinsic Equivalent VSUBSD __m128d _mm_mask_sub_sd (__m128d s, __mmask8 k, __m128d a, __m128d b); VSUBSD __m128d _mm_maskz_sub_sd (__mmask8 k, __m128d a, __m128d b); VSUBSD __m128d _mm_sub_round_sd (__m128d a, __m128d b, int); VSUBSD __m128d _mm_mask_sub_round_sd (__m128d s, __mmask8 k, __m128d a, __m128d b, int); VSUBSD __m128d _mm_maskz_sub_round_sd (__mmask8 k, __m128d a, __m128d b, int); SUBSD __m128d _mm_sub_sd (__m128d a, __m128d b); SIMD Floating-Point Exceptions Overflow, Underflow, Invalid, Precision, Denormal Other Exceptions VEX-encoded instructions, see Table2-20, “Type 3 Class Exception Conditions”. EVEX-encoded instructions, see Table2-47, “Type E3 Class Exception Conditions”. This UNOFFICIAL reference was generated from the official Intel® 64 and IA-32 Architectures Software Developer’s Manual by a dumb script. There is no guarantee that some parts aren't mangled or broken and is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .