vmulps

Multiply Packed Single-Precision (AVX)

VMULPS ymm1, ymm2, ymm3/m256

Multiplies packed floats (256-bit).

Details

Multiplies four packed single-precision floating-point values from the source operand by the corresponding values in the first source operand and stores the result in the destination YMM register. Floating-point exceptions and rounding mode are controlled by MXCSR. Does not modify EFLAGS. Requires AVX and is available in 64-bit mode; operates on 256-bit YMM registers or memory with three-operand form.

Pseudocode Operation

dest[255:0] ← src1[255:0] * src2[255:0];
for i ← 0 to 7 do
  dest[32*i+31:32*i] ← FP32_Multiply(src1[32*i+31:32*i], src2[32*i+31:32*i]);
endfor;

Example

VMULPS ymm1, ymm2, ymm3/m256

Encoding

Binary Layout

VEX

ModRM

Format VEX

Opcode VEX.256.0F.WIG 59 /r

Extension AVX

Operands

dest
256-bit YMM AVX register
src1
256-bit YMM AVX register
src2
256-bit YMM AVX register or Memory operand

Reference (Intel® SDM)

Instruction Forms

Opcode	Instruction	Op/En	64/32-bit Mode	CPUID	Description
NP 0F 59 /r	MULPS xmm1, xmm2/m128	A	V/V	SSE	Multiply packed single precision floating-point values in xmm2/m128 with xmm1 and store result in xmm1.
VEX.128.0F.WIG 59 /r	VMULPS xmm1,xmm2, xmm3/m128	B	V/V	AVX	Multiply packed single precision floating-point values in xmm3/m128 with xmm2 and store result in xmm1.
VEX.256.0F.WIG 59 /r	VMULPS ymm1, ymm2, ymm3/m256	B	V/V	AVX	Multiply packed single precision floating-point values in ymm3/m256 with ymm2 and store result in ymm1.
EVEX.128.0F.W0 59 /r	VMULPS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst	C	V/V	(AVX512VL AND AVX512F) OR AVX10.1	Multiply packed single precision floating-point values from xmm3/m128/m32bcst to xmm2 and store result in xmm1.
EVEX.256.0F.W0 59 /r	VMULPS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst	C	V/V	(AVX512VL AND AVX512F) OR AVX10.1	Multiply packed single precision floating-point values from ymm3/m256/m32bcst to ymm2 and store result in ymm1.
EVEX.512.0F.W0 59 /r	VMULPS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst {er}	C	V/V	AVX512F OR AVX10.1	Multiply packed single precision floating-point values in zmm3/m512/m32bcst with zmm2 and store result in zmm1.

Instruction Operand Encoding

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

Description

Multiply the packed single precision floating-point values from the first source operand with the corresponding values in the second source operand, and stores the packed double precision floating-point results in the destination operand. EVEX encoded versions: The first source operand (the second operand) is a ZMM/YMM/XMM register. The second source operand can be a ZMM/YMM/XMM register, a 512/256/128-bit memory location or a 512/256/128-bit vector broadcasted from a 32-bit memory location. The destination operand is a ZMM/YMM/XMM register conditionally updated with writemask k1. VEX.256 encoded version: The first source operand is a YMM register. The second source operand can be a YMM register or a 256-bit memory location. The destination operand is a YMM register. Bits (MAXVL-1:256) of the corresponding destination ZMM register are zeroed. VEX.128 encoded version: The first source operand is a XMM register. The second source operand can be a XMM register or a 128-bit memory location. The destination operand is a XMM register. The upper bits (MAXVL-1:128) of the destination YMM register destination are zeroed. 128-bit Legacy SSE version: The second source can be an XMM register or an 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. MULPS—Multiply Packed Single Precision Floating-Point Values Vol. 2B 4-146

Operation

VMULPS (EVEX Encoded Version)
(KL, VL) = (4, 128), (8, 256), (16, 512)
IF (VL = 512) AND (EVEX.b = 1) AND SRC2 *is a 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 * 32
IF k1[j] OR *no writemask*
THEN
IF (EVEX.b = 1) AND (SRC2 *is memory*)
THEN
DEST[i+31:i] := SRC1[i+31:i] * SRC2[31:0]
ELSE
DEST[i+31:i] := SRC1[i+31:i] * SRC2[i+31:i]
FI;
ELSE
IF *merging-masking*                                 ; merging-masking
THEN *DEST[i+31:i] remains unchanged*
ELSE                                                         ; zeroing-masking
DEST[i+31:i] := 0
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

VMULPS (VEX.256 Encoded Version)
DEST[31:0] := SRC1[31:0] * SRC2[31:0]
DEST[63:32] := SRC1[63:32] * SRC2[63:32]
DEST[95:64] := SRC1[95:64] * SRC2[95:64]
DEST[127:96] := SRC1[127:96] * SRC2[127:96]
DEST[159:128] := SRC1[159:128] * SRC2[159:128]
DEST[191:160] := SRC1[191:160] * SRC2[191:160]
DEST[223:192] := SRC1[223:192] * SRC2[223:192]
DEST[255:224] := SRC1[255:224] * SRC2[255:224].
DEST[MAXVL-1:256] := 0;

VMULPS (VEX.128 Encoded Version)
DEST[31:0] := SRC1[31:0] * SRC2[31:0]
DEST[63:32] := SRC1[63:32] * SRC2[63:32]
DEST[95:64] := SRC1[95:64] * SRC2[95:64]
DEST[127:96] := SRC1[127:96] * SRC2[127:96]
DEST[MAXVL-1:128] := 0

MULPS (128-bit Legacy SSE Version)
DEST[31:0] := SRC1[31:0] * SRC2[31:0]
DEST[63:32] := SRC1[63:32] * SRC2[63:32]
DEST[95:64] := SRC1[95:64] * SRC2[95:64]
DEST[127:96] := SRC1[127:96] * SRC2[127:96]
DEST[MAXVL-1:128] (Unmodified)



MULPS—Multiply Packed Single Precision Floating-Point Values                                                                                 Vol. 2B 4-147

Intel C/C++ Compiler Intrinsic Equivalent

VMULPS __m512 _mm512_mul_ps( __m512 a, __m512 b);
VMULPS __m512 _mm512_mask_mul_ps(__m512 s, __mmask16 k, __m512 a, __m512 b);
VMULPS __m512 _mm512_maskz_mul_ps(__mmask16 k, __m512 a, __m512 b);
VMULPS __m512 _mm512_mul_round_ps( __m512 a, __m512 b, int);
VMULPS __m512 _mm512_mask_mul_round_ps(__m512 s, __mmask16 k, __m512 a, __m512 b, int);
VMULPS __m512 _mm512_maskz_mul_round_ps(__mmask16 k, __m512 a, __m512 b, int);
VMULPS __m256 _mm256_mask_mul_ps(__m256 s, __mmask8 k, __m256 a, __m256 b);
VMULPS __m256 _mm256_maskz_mul_ps(__mmask8 k, __m256 a, __m256 b);
VMULPS __m128 _mm_mask_mul_ps(__m128 s, __mmask8 k, __m128 a, __m128 b);
VMULPS __m128 _mm_maskz_mul_ps(__mmask8 k, __m128 a, __m128 b);
VMULPS __m256 _mm256_mul_ps (__m256 a, __m256 b);
MULPS __m128 _mm_mul_ps (__m128 a, __m128 b);

Exceptions

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal.

Other Exceptions

Non-EVEX-encoded instruction, see Table 2-19, “Type 2 Class Exception Conditions.” EVEX-encoded instruction, see Table 2-48, “Type E2 Class Exception Conditions.” MULPS—Multiply Packed Single Precision Floating-Point Values Vol. 2B 4-148