| Opcode/Instruction | Op /En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
|
F3 0F 59 /r MULSS xmm1,xmm2/m32 |
RM | V/V | SSE | Multiply the low single-precision floating-point value in xmm2/m32 by the low single-precision floating-point value in xmm1. |
|
VEX.NDS.128.F3.0F.WIG 59 /r VMULSS xmm1,xmm2, xmm3/m32 |
RVM | V/V | AVX | Multiply the low single-precision floating-point value in xmm3/m32 by the low single-precision floating-point value in xmm2. |
|
EVEX.NDS.LIG.F3.0F.W0 59 /r VMULSS xmm1 {k1}{z}, xmm2, xmm3/m32 {er} |
T1S | V/V | AVX512F | Multiply the low single-precision floating-point value in xmm3/m32 by the low single-precision floating-point value in xmm2. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
| RVM | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | NA |
| T1S | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | NA |
Description
Multiplies the low single-precision floating-point value from the second source operand by the low single-precision floating-point value in the first source operand, and stores the single-precision floating-point result in the destina-tion operand. The second source operand can be an XMM register or a 32-bit memory location. The first source operand and the destination operands are XMM registers.
128-bit Legacy SSE version: The first source operand and the destination operand are the same. Bits (MAX_VL-1:32) of the corresponding YMM destination register remain unchanged.
VEX.128 and EVEX encoded version: The first source operand is an xmm register encoded by VEX.vvvv. The three high-order doublewords of the destination operand are copied from the first source operand. Bits (MAX_VL-1:128) of the destination register are zeroed.
EVEX encoded version: The low doubleword element of the destination operand is updated according to the writemask.
Software should ensure VMULSS is encoded with VEX.L=0. Encoding VMULSS with VEX.L=1 may encounter unpre-dictable behavior across different processor generations.
Operation
VMULSS (EVEX encoded version)
IF (EVEX.b = 1) AND SRC2 *is a register*
THEN
SET_RM(EVEX.RC);
ELSE
SET_RM(MXCSR.RM);
FI;
IF k1[0] or *no writemask*
THEN
DEST[31:0] (cid:197) SRC1[31:0] * SRC2[31:0]
ELSE
IF *merging-masking*
; merging-masking
THEN *DEST[31:0] remains unchanged*
ELSE
; zeroing-masking
THEN DEST[31:0] (cid:197) 0
FI
FI;
ENDFOR
DEST[127:32] (cid:197) SRC1[127:32]
DEST[MAX_VL-1:128] (cid:197) 0
VMULSS (VEX.128 encoded version)
DEST[31:0] (cid:197)SRC1[31:0] * SRC2[31:0]
DEST[127:32] (cid:197)SRC1[127:32]
DEST[MAX_VL-1:128] (cid:197)0
MULSS (128-bit Legacy SSE version)
DEST[31:0] (cid:197)DEST[31:0] * SRC[31:0]
DEST[MAX_VL-1:32] (Unmodified)
Intel C/C++ Compiler Intrinsic Equivalent
VMULSS __m128 _mm_mask_mul_ss(__m128 s, __mmask8 k, __m128 a, __m128 b);
VMULSS __m128 _mm_maskz_mul_ss( __mmask8 k, __m128 a, __m128 b);
VMULSS __m128 _mm_mul_round_ss( __m128 a, __m128 b, int);
VMULSS __m128 _mm_mask_mul_round_ss(__m128 s, __mmask8 k, __m128 a, __m128 b, int);
VMULSS __m128 _mm_maskz_mul_round_ss( __mmask8 k, __m128 a, __m128 b, int);
MULSS __m128 _mm_mul_ss(__m128 a, __m128 b)
SIMD Floating-Point Exceptions
Underflow, Overflow, Invalid, Precision, Denormal
Other Exceptions
Non-EVEX-encoded instruction, see Exceptions Type 3.
EVEX-encoded instruction, see Exceptions Type E3.