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400 lines
18 KiB
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg" xmlns:x86="http://www.felixcloutier.com/x86"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link rel="stylesheet" type="text/css" href="style.css"></link><title>VFMSUB132PS/VFMSUB213PS/VFMSUB231PS
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— Fused Multiply-Subtract of Packed SinglePrecision Floating-Point Values</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>VFMSUB132PS/VFMSUB213PS/VFMSUB231PS
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— Fused Multiply-Subtract of Packed SinglePrecision Floating-Point Values</h1>
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<table>
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<tr>
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<th>Opcode/Instruction</th>
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<th>Op/En</th>
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<th>64/32 Bit Mode Support</th>
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<th>CPUID Feature Flag</th>
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<th>Description</th></tr>
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<tr>
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<td>VEX.128.66.0F38.W0 9A /r VFMSUB132PS xmm1, xmm2, xmm3/m128</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from xmm1 and xmm3/mem, subtract xmm2 and put result in xmm1.</td></tr>
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<tr>
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<td>VEX.128.66.0F38.W0 AA /r VFMSUB213PS xmm1, xmm2, xmm3/m128</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from xmm1 and xmm2, subtract xmm3/mem and put result in xmm1.</td></tr>
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<tr>
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<td>VEX.128.66.0F38.W0 BA /r VFMSUB231PS xmm1, xmm2, xmm3/m128</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from xmm2 and xmm3/mem, subtract xmm1 and put result in xmm1.</td></tr>
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<tr>
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<td>VEX.256.66.0F38.W0 9A /r VFMSUB132PS ymm1, ymm2, ymm3/m256</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from ymm1 and ymm3/mem, subtract ymm2 and put result in ymm1.</td></tr>
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<tr>
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<td>VEX.256.66.0F38.W0 AA /r VFMSUB213PS ymm1, ymm2, ymm3/m256</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from ymm1 and ymm2, subtract ymm3/mem and put result in ymm1.</td></tr>
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<tr>
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<td>VEX.256.66.0F38.0 BA /r VFMSUB231PS ymm1, ymm2, ymm3/m256</td>
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<td>A</td>
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<td>V/V</td>
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<td>FMA</td>
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<td>Multiply packed single precision floating-point values from ymm2 and ymm3/mem, subtract ymm1 and put result in ymm1.</td></tr>
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<tr>
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<td>EVEX.128.66.0F38.W0 9A /r VFMSUB132PS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from xmm1 and xmm3/m128/m32bcst, subtract xmm2 and put result in xmm1.</td></tr>
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<tr>
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<td>EVEX.128.66.0F38.W0 AA /r VFMSUB213PS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from xmm1 and xmm2, subtract xmm3/m128/m32bcst and put result in xmm1.</td></tr>
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<tr>
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<td>EVEX.128.66.0F38.W0 BA /r VFMSUB231PS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from xmm2 and xmm3/m128/m32bcst, subtract xmm1 and put result in xmm1.</td></tr>
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<tr>
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<td>EVEX.256.66.0F38.W0 9A /r VFMSUB132PS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from ymm1 and ymm3/m256/m32bcst, subtract ymm2 and put result in ymm1.</td></tr>
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<tr>
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<td>EVEX.256.66.0F38.W0 AA /r VFMSUB213PS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from ymm1 and ymm2, subtract ymm3/m256/m32bcst and put result in ymm1.</td></tr>
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<tr>
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<td>EVEX.256.66.0F38.W0 BA /r VFMSUB231PS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512VL AVX512F</td>
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<td>Multiply packed single precision floating-point values from ymm2 and ymm3/m256/m32bcst, subtract ymm1 and put result in ymm1.</td></tr>
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<tr>
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<td>EVEX.512.66.0F38.W0 9A /r VFMSUB132PS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst{er}</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512F</td>
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<td>Multiply packed single precision floating-point values from zmm1 and zmm3/m512/m32bcst, subtract zmm2 and put result in zmm1.</td></tr>
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<tr>
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<td>EVEX.512.66.0F38.W0 AA /r VFMSUB213PS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst{er}</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512F</td>
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<td>Multiply packed single precision floating-point values from zmm1 and zmm2, subtract zmm3/m512/m32bcst and put result in zmm1.</td></tr>
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<tr>
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<td>EVEX.512.66.0F38.W0 BA /r VFMSUB231PS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst{er}</td>
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<td>B</td>
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<td>V/V</td>
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<td>AVX512F</td>
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<td>Multiply packed single precision floating-point values from zmm2 and zmm3/m512/m32bcst, subtract zmm1 and put result in zmm1.</td></tr></table>
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<h2 id="instruction-operand-encoding">Instruction Operand Encoding<a class="anchor" href="#instruction-operand-encoding">
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¶
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</a></h2>
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<table>
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<tr>
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<th>Op/En</th>
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<th>Tuple Type</th>
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<th>Operand 1</th>
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<th>Operand 2</th>
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<th>Operand 3</th>
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<th>Operand 4</th></tr>
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<tr>
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<td>A</td>
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<td>N/A</td>
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<td>ModRM:reg (r, w)</td>
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<td>VEX.vvvv (r)</td>
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<td>ModRM:r/m (r)</td>
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<td>N/A</td></tr>
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<tr>
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<td>B</td>
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<td>Full</td>
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<td>ModRM:reg (r, w)</td>
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<td>EVEX.vvvv (r)</td>
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<td>ModRM:r/m (r)</td>
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<td>N/A</td></tr></table>
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<h3 id="description">Description<a class="anchor" href="#description">
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¶
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</a></h3>
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<p>Performs a set of SIMD multiply-subtract computation on packed single precision floating-point values using three source operands and writes the multiply-subtract results in the destination operand. The destination operand is also the first source operand. The second operand must be a SIMD register. The third source operand can be a SIMD register or a memory location.</p>
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<p>VFMSUB132PS: Multiplies the four, eight or sixteen packed single precision floating-point values from the first source operand to the four, eight or sixteen packed single precision floating-point values in the third source operand. From the infinite precision intermediate result, subtracts the four, eight or sixteen packed single precision floating-point values in the second source operand, performs rounding and stores the resulting four, eight or sixteen packed single precision floating-point values to the destination operand (first source operand).</p>
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<p>VFMSUB213PS: Multiplies the four, eight or sixteen packed single precision floating-point values from the second source operand to the four, eight or sixteen packed single precision floating-point values in the first source operand. From the infinite precision intermediate result, subtracts the four, eight or sixteen packed single precision floating-point values in the third source operand, performs rounding and stores the resulting four, eight or sixteen packed single precision floating-point values to the destination operand (first source operand).</p>
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<p>VFMSUB231PS: Multiplies the four, eight or sixteen packed single precision floating-point values from the second source to the four, eight or sixteen packed single precision floating-point values in the third source operand. From the infinite precision intermediate result, subtracts the four, eight or sixteen packed single precision floating-point values in the first source operand, performs rounding and stores the resulting four, eight or sixteen packed single precision floating-point values to the destination operand (first source operand).</p>
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<p>EVEX encoded versions: The destination operand (also first source operand) and the second source operand are ZMM/YMM/XMM register. The third 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 32-bit memory location. The destination operand is conditionally updated with write mask k1.</p>
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<p>VEX.256 encoded version: The destination operand (also first source operand) is a YMM register and encoded in reg_field. The second source operand is a YMM register and encoded in VEX.vvvv. The third source operand is a YMM register or a 256-bit memory location and encoded in rm_field.</p>
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<p>VEX.128 encoded version: The destination operand (also first source operand) is a XMM register and encoded in reg_field. The second source operand is a XMM register and encoded in VEX.vvvv. The third source operand is a XMM register or a 128-bit memory location and encoded in rm_field. The upper 128 bits of the YMM destination register are zeroed.</p>
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<h3 id="operation">Operation<a class="anchor" href="#operation">
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¶
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</a></h3>
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<pre>In the operations below, “*” and “-” symbols represent multiplication and subtraction with infinite precision inputs and outputs (no
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rounding).
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</pre>
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<h4 id="vfmsub132ps-dest--src2--src3--vex-encoded-version-">VFMSUB132PS DEST, SRC2, SRC3 (VEX encoded version)<a class="anchor" href="#vfmsub132ps-dest--src2--src3--vex-encoded-version-">
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¶
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</a></h4>
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<pre>IF (VEX.128) THEN
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MAXNUM := 2
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ELSEIF (VEX.256)
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MAXNUM := 4
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FI
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For i = 0 to MAXNUM-1 {
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n := 32*i;
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DEST[n+31:n] := RoundFPControl_MXCSR(DEST[n+31:n]*SRC3[n+31:n] - SRC2[n+31:n])
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}
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IF (VEX.128) THEN
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DEST[MAXVL-1:128] := 0
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ELSEIF (VEX.256)
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DEST[MAXVL-1:256] := 0
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FI
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</pre>
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<h4 id="vfmsub213ps-dest--src2--src3--vex-encoded-version-">VFMSUB213PS DEST, SRC2, SRC3 (VEX encoded version)<a class="anchor" href="#vfmsub213ps-dest--src2--src3--vex-encoded-version-">
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¶
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</a></h4>
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<pre>IF (VEX.128) THEN
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MAXNUM := 2
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ELSEIF (VEX.256)
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MAXNUM := 4
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FI
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For i = 0 to MAXNUM-1 {
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n := 32*i;
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DEST[n+31:n] := RoundFPControl_MXCSR(SRC2[n+31:n]*DEST[n+31:n] - SRC3[n+31:n])
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}
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IF (VEX.128) THEN
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DEST[MAXVL-1:128] := 0
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ELSEIF (VEX.256)
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DEST[MAXVL-1:256] := 0
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FI
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</pre>
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<h4 id="vfmsub231ps-dest--src2--src3--vex-encoded-version-">VFMSUB231PS DEST, SRC2, SRC3 (VEX encoded version)<a class="anchor" href="#vfmsub231ps-dest--src2--src3--vex-encoded-version-">
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¶
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</a></h4>
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<pre>IF (VEX.128) THEN
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MAXNUM := 2
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ELSEIF (VEX.256)
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MAXNUM := 4
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FI
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For i = 0 to MAXNUM-1 {
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n := 32*i;
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DEST[n+31:n] := RoundFPControl_MXCSR(SRC2[n+31:n]*SRC3[n+31:n] - DEST[n+31:n])
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}
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IF (VEX.128) THEN
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DEST[MAXVL-1:128] := 0
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ELSEIF (VEX.256)
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DEST[MAXVL-1:256] := 0
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FI
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</pre>
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<h4 id="vfmsub132ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">VFMSUB132PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a register)<a class="anchor" href="#vfmsub132ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">
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¶
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</a></h4>
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<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
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IF (VL = 512) AND (EVEX.b = 1)
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THEN
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);
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ELSE
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);
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FI;
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FOR j := 0 TO KL-1
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i := j * 32
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IF k1[j] OR *no writemask*
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THEN DEST[i+31:i] :=
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RoundFPControl(DEST[i+31:i]*SRC3[i+31:i] - SRC2[i+31:i])
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ELSE
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IF *merging-masking* ; merging-masking
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THEN *DEST[i+31:i] remains unchanged*
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ELSE ; zeroing-masking
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DEST[i+31:i] := 0
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FI
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FI;
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ENDFOR
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DEST[MAXVL-1:VL] := 0
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</pre>
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<h4 id="vfmsub132ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">VFMSUB132PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a memory source)<a class="anchor" href="#vfmsub132ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">
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¶
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</a></h4>
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<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
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FOR j := 0 TO KL-1
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i := j * 32
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IF k1[j] OR *no writemask*
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THEN
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IF (EVEX.b = 1)
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THEN
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DEST[i+31:i] :=
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RoundFPControl_MXCSR(DEST[i+31:i]*SRC3[31:0] - SRC2[i+31:i])
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ELSE
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DEST[i+31:i] :=
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RoundFPControl_MXCSR(DEST[i+31:i]*SRC3[i+31:i] - SRC2[i+31:i])
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FI;
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ELSE
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IF *merging-masking* ; merging-masking
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THEN *DEST[i+31:i] remains unchanged*
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ELSE ; zeroing-masking
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DEST[i+31:i] := 0
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FI
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FI;
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ENDFOR
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DEST[MAXVL-1:VL] := 0
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</pre>
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<h4 id="vfmsub213ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">VFMSUB213PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a register)<a class="anchor" href="#vfmsub213ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">
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¶
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</a></h4>
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<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
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IF (VL = 512) AND (EVEX.b = 1)
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THEN
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);
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ELSE
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);
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FI;
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FOR j := 0 TO KL-1
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i := j * 32
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IF k1[j] OR *no writemask*
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THEN DEST[i+31:i] :=
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RoundFPControl_MXCSR(SRC2[i+31:i]*DEST[i+31:i] - SRC3[i+31:i])
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ELSE
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IF *merging-masking* ; merging-masking
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THEN *DEST[i+31:i] remains unchanged*
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ELSE ; zeroing-masking
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DEST[i+31:i] := 0
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FI
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FI;
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ENDFOR
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DEST[MAXVL-1:VL] := 0
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</pre>
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<h4 id="vfmsub213ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">VFMSUB213PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a memory source)<a class="anchor" href="#vfmsub213ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">
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¶
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</a></h4>
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<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
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FOR j := 0 TO KL-1
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i := j * 32
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IF k1[j] OR *no writemask*
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THEN
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IF (EVEX.b = 1)
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THEN
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DEST[i+31:i] :=
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RoundFPControl_MXCSR(SRC2[i+31:i]*DEST[i+31:i] - SRC3[31:0])
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ELSE
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DEST[i+31:i] :=
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RoundFPControl_MXCSR(SRC2[i+31:i]*DEST[i+31:i] - SRC3[i+31:i])
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FI;
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ELSE
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IF *merging-masking* ; merging-masking
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THEN *DEST[i+31:i] remains unchanged*
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ELSE ; zeroing-masking
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DEST[i+31:i] := 0
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FI
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FI;
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ENDFOR
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DEST[MAXVL-1:VL] := 0
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</pre>
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<h4 id="vfmsub231ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">VFMSUB231PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a register)<a class="anchor" href="#vfmsub231ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-register-">
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¶
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</a></h4>
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<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
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IF (VL = 512) AND (EVEX.b = 1)
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THEN
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);
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ELSE
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SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);
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FI;
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FOR j := 0 TO KL-1
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i := j * 32
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IF k1[j] OR *no writemask*
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THEN DEST[i+31:i] :=
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RoundFPControl_MXCSR(SRC2[i+31:i]*SRC3[i+31:i] - DEST[i+31:i])
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ELSE
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IF *merging-masking* ; merging-masking
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THEN *DEST[i+31:i] remains unchanged*
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ELSE ; zeroing-masking
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DEST[i+31:i] := 0
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FI
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FI;
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ENDFOR
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DEST[MAXVL-1:VL] := 0
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</pre>
|
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<h4 id="vfmsub231ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">VFMSUB231PS DEST, SRC2, SRC3 (EVEX encoded version, when src3 operand is a memory source)<a class="anchor" href="#vfmsub231ps-dest--src2--src3--evex-encoded-version--when-src3-operand-is-a-memory-source-">
|
||
¶
|
||
</a></h4>
|
||
<pre>(KL, VL) = (4, 128), (8, 256), (16, 512)
|
||
FOR j := 0 TO KL-1
|
||
i := j * 32
|
||
IF k1[j] OR *no writemask*
|
||
THEN
|
||
IF (EVEX.b = 1)
|
||
THEN
|
||
DEST[i+31:i] :=
|
||
RoundFPControl_MXCSR(SRC2[i+31:i]*SRC3[31:0] - DEST[i+31:i])
|
||
ELSE
|
||
DEST[i+31:i] :=
|
||
RoundFPControl_MXCSR(SRC2[i+31:i]*SRC3[i+31:i] - DEST[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
|
||
</pre>
|
||
<h3 id="intel-c-c++-compiler-intrinsic-equivalent">Intel C/C++ Compiler Intrinsic Equivalent<a class="anchor" href="#intel-c-c++-compiler-intrinsic-equivalent">
|
||
¶
|
||
</a></h3>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_fmsub_ps(__m512 a, __m512 b, __m512 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_fmsub_round_ps(__m512 a, __m512 b, __m512 c, int r);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_mask_fmsub_ps(__m512 a, __mmask16 k, __m512 b, __m512 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_maskz_fmsub_ps(__mmask16 k, __m512 a, __m512 b, __m512 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_mask3_fmsub_ps(__m512 a, __m512 b, __m512 c, __mmask16 k);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_mask_fmsub_round_ps(__m512 a, __mmask16 k, __m512 b, __m512 c, int r);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_maskz_fmsub_round_ps(__mmask16 k, __m512 a, __m512 b, __m512 c, int r);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m512 _mm512_mask3_fmsub_round_ps(__m512 a, __m512 b, __m512 c, __mmask16 k, int r);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m256 _mm256_mask_fmsub_ps(__m256 a, __mmask8 k, __m256 b, __m256 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m256 _mm256_maskz_fmsub_ps(__mmask8 k, __m256 a, __m256 b, __m256 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m256 _mm256_mask3_fmsub_ps(__m256 a, __m256 b, __m256 c, __mmask8 k);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m128 _mm_mask_fmsub_ps(__m128 a, __mmask8 k, __m128 b, __m128 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m128 _mm_maskz_fmsub_ps(__mmask8 k, __m128 a, __m128 b, __m128 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m128 _mm_mask3_fmsub_ps(__m128 a, __m128 b, __m128 c, __mmask8 k);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m128 _mm_fmsub_ps (__m128 a, __m128 b, __m128 c);
|
||
</pre>
|
||
<pre>VFMSUBxxxPS __m256 _mm256_fmsub_ps (__m256 a, __m256 b, __m256 c);
|
||
</pre>
|
||
<h3 class="exceptions" id="simd-floating-point-exceptions">SIMD Floating-Point Exceptions<a class="anchor" href="#simd-floating-point-exceptions">
|
||
¶
|
||
</a></h3>
|
||
<p>Overflow, Underflow, Invalid, Precision, Denormal.</p>
|
||
<h3 class="exceptions" id="other-exceptions">Other Exceptions<a class="anchor" href="#other-exceptions">
|
||
¶
|
||
</a></h3>
|
||
<p>VEX-encoded instructions, see <span class="not-imported">Table 2-19</span>, “Type 2 Class Exception Conditions.”</p>
|
||
<p>EVEX-encoded instructions, see <span class="not-imported">Table 2-46</span>, “Type E2 Class Exception Conditions.”</p><footer><p>
|
||
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be
|
||
inc<span style="opacity: 0.2">omp</span>lete or b<sub>r</sub>oke<sub>n</sub> in various obvious or non-obvious
|
||
ways. Refer to <a href="https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4">Intel® 64 and IA-32 Architectures Software Developer’s Manual</a> for anything serious.
|
||
</p></footer></body></html>
|