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feat(arch): add the AVX512-FP16 FMA families to the extension layer

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Assisted-by: GLM 5.3 Flash
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petrbalvin committed 2026-10-07 18:58:49 +02:00
1 parent 87493d9391
commit 8080e0acef
3 files changed
+406 -10
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arch/amd64_ext.go
+161 -5
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@@ -684,7 +684,9 @@ func (in ExtInstr) amd64Imm8(op ExtOperand, pos int) (byte, error) {
// encodeAmdVec3Imm fills the three-vector form with a control immediate:
// imm, src1, src2, dest, the order the reference listings write it in. An
// entry with Mem set takes the memory shape of the second source, xmm3/m16
// in the manual.
// in the manual. The destination takes the write mask where the entry
// declares one, the packed imm8-control forms the manual masks; the scalar
// forms take none, and the entry's flag refuses the spelling for them.
func (in ExtInstr) encodeAmdVec3Imm(ops []ExtOperand) ([]byte, error) {
class := amd64LengthClass(in.Bytes)
imm, err := in.amd64Imm8(ops[0], 1)
@@ -694,23 +696,29 @@ func (in ExtInstr) encodeAmdVec3Imm(ops []ExtOperand) ([]byte, error) {
if err := in.amd64Vector(ops[1], class, 2); err != nil {
return nil, err
}
dest, mask, zeroing, _, err := in.amd64WriteMask(ops[3], 4)
if err != nil {
return nil, err
}
if in.Mem == 3 && ops[2].Kind == ExtMem {
if err := in.amd64Vector(ops[3], class, 4); err != nil {
if err := in.amd64Vector(dest, class, 4); err != nil {
return nil, err
}
out, err := in.amd64MemBytes(in.Bytes, ops[3].Reg, ops[1].Reg, ops[2], 3)
out, err := in.amd64MemBytes(in.Bytes, dest.Reg, ops[1].Reg, ops[2], 3)
if err != nil {
return nil, err
}
amd64ApplyMask(out, mask, zeroing)
return append(out, imm), nil
}
if err := in.amd64Vector(ops[2], class, 3); err != nil {
return nil, err
}
if err := in.amd64Vector(ops[3], class, 4); err != nil {
if err := in.amd64Vector(dest, class, 4); err != nil {
return nil, err
}
out := amd64Encode(in.Bytes, ops[3].Reg, ops[1].Reg, ops[2].Reg)
out := amd64Encode(in.Bytes, dest.Reg, ops[1].Reg, ops[2].Reg)
amd64ApplyMask(out, mask, zeroing)
return append(out, imm), nil
}
@@ -1389,4 +1397,152 @@ var amd64Extensions = []ExtInstr{
{Name: "VGETMANTPH", Summary: "Extract the normalised mantissas of packed FP16 values under an imm8 control",
Bytes: []byte{0x62, 0x03, 0x04, 0x00, 0x26, 0xC0}, Form: ExtFormAmdVec2Imm, Mem: 2, Mask: true, Imm8: ExtImm8GetMant, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VGETMANTPH (EVEX.128.NP.0F3A.W0 26 /r /ib)"},
// AVX512-FP16 packed fused multiply-add: the twelve packed FMA
// mnemonics of the FMA group, 132, 213 and 231 under the multiply-add,
// multiply-subtract, add-subtract and subtract-add pairings, three
// register widths each. EVEX.NDS.66.MAP6.W0 throughout, the opcode low
// byte the AVX512F single-precision FMA group carries one map over: 98
// the add, 9A the subtract, 96 the add-subtract and 97 the
// subtract-add, the 213 and 231 forms ten and twenty above. The 512-bit
// register forms take the embedded rounding, the VL forms none; the
// destinations take the write mask and the memory shape of the second
// source the {1toN} broadcast. The golden vectors are quoted from the
// local GNU assembler, whose FP16 table matches the SDM entries row for
// row; the add-subtract pairing adds on the odd lanes and subtracts on
// the even ones, the subtract-add pairing the reverse.
{Name: "VFMADD132PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0x98, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD132PH (EVEX.NDS.512.66.MAP6.W0 98 /r)"},
{Name: "VFMADD132PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0x98, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD132PH (EVEX.NDS.256.66.MAP6.W0 98 /r)"},
{Name: "VFMADD132PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x98, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD132PH (EVEX.NDS.128.66.MAP6.W0 98 /r)"},
{Name: "VFMADD213PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor and the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xA8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD213PH (EVEX.NDS.512.66.MAP6.W0 A8 /r)"},
{Name: "VFMADD213PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor and the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xA8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD213PH (EVEX.NDS.256.66.MAP6.W0 A8 /r)"},
{Name: "VFMADD213PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying a factor and the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xA8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD213PH (EVEX.NDS.128.66.MAP6.W0 A8 /r)"},
{Name: "VFMADD231PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xB8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD231PH (EVEX.NDS.512.66.MAP6.W0 B8 /r)"},
{Name: "VFMADD231PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xB8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD231PH (EVEX.NDS.256.66.MAP6.W0 B8 /r)"},
{Name: "VFMADD231PH", Summary: "Multiply packed FP16 values and add the product, the destination supplying the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xB8, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD231PH (EVEX.NDS.128.66.MAP6.W0 B8 /r)"},
{Name: "VFMSUB132PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0x9A, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB132PH (EVEX.NDS.512.66.MAP6.W0 9A /r)"},
{Name: "VFMSUB132PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0x9A, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB132PH (EVEX.NDS.256.66.MAP6.W0 9A /r)"},
{Name: "VFMSUB132PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x9A, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB132PH (EVEX.NDS.128.66.MAP6.W0 9A /r)"},
{Name: "VFMSUB213PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor and the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xAA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB213PH (EVEX.NDS.512.66.MAP6.W0 AA /r)"},
{Name: "VFMSUB213PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor and the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xAA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB213PH (EVEX.NDS.256.66.MAP6.W0 AA /r)"},
{Name: "VFMSUB213PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying a factor and the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xAA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB213PH (EVEX.NDS.128.66.MAP6.W0 AA /r)"},
{Name: "VFMSUB231PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xBA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB231PH (EVEX.NDS.512.66.MAP6.W0 BA /r)"},
{Name: "VFMSUB231PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xBA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB231PH (EVEX.NDS.256.66.MAP6.W0 BA /r)"},
{Name: "VFMSUB231PH", Summary: "Multiply packed FP16 values and subtract the product, the destination supplying the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xBA, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB231PH (EVEX.NDS.128.66.MAP6.W0 BA /r)"},
{Name: "VFMADDSUB132PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0x96, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB132PH (EVEX.NDS.512.66.MAP6.W0 96 /r)"},
{Name: "VFMADDSUB132PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0x96, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB132PH (EVEX.NDS.256.66.MAP6.W0 96 /r)"},
{Name: "VFMADDSUB132PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x96, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB132PH (EVEX.NDS.128.66.MAP6.W0 96 /r)"},
{Name: "VFMADDSUB213PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xA6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB213PH (EVEX.NDS.512.66.MAP6.W0 A6 /r)"},
{Name: "VFMADDSUB213PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xA6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB213PH (EVEX.NDS.256.66.MAP6.W0 A6 /r)"},
{Name: "VFMADDSUB213PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xA6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB213PH (EVEX.NDS.128.66.MAP6.W0 A6 /r)"},
{Name: "VFMADDSUB231PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xB6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB231PH (EVEX.NDS.512.66.MAP6.W0 B6 /r)"},
{Name: "VFMADDSUB231PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xB6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB231PH (EVEX.NDS.256.66.MAP6.W0 B6 /r)"},
{Name: "VFMADDSUB231PH", Summary: "Multiply packed FP16 values, adding the product on the odd lanes and subtracting it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xB6, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADDSUB231PH (EVEX.NDS.128.66.MAP6.W0 B6 /r)"},
{Name: "VFMSUBADD132PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0x97, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD132PH (EVEX.NDS.512.66.MAP6.W0 97 /r)"},
{Name: "VFMSUBADD132PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0x97, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD132PH (EVEX.NDS.256.66.MAP6.W0 97 /r)"},
{Name: "VFMSUBADD132PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x97, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD132PH (EVEX.NDS.128.66.MAP6.W0 97 /r)"},
{Name: "VFMSUBADD213PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xA7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD213PH (EVEX.NDS.512.66.MAP6.W0 A7 /r)"},
{Name: "VFMSUBADD213PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xA7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD213PH (EVEX.NDS.256.66.MAP6.W0 A7 /r)"},
{Name: "VFMSUBADD213PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying a factor and the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xA7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD213PH (EVEX.NDS.128.66.MAP6.W0 A7 /r)"},
{Name: "VFMSUBADD231PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x40, 0xB7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Er: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD231PH (EVEX.NDS.512.66.MAP6.W0 B7 /r)"},
{Name: "VFMSUBADD231PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x20, 0xB7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD231PH (EVEX.NDS.256.66.MAP6.W0 B7 /r)"},
{Name: "VFMSUBADD231PH", Summary: "Multiply packed FP16 values, subtracting the product on the odd lanes and adding it on the even ones, the destination supplying the added or subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xB7, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Mask: true, Bcast: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUBADD231PH (EVEX.NDS.128.66.MAP6.W0 B7 /r)"},
// AVX512-FP16 scalar fused multiply-add: the scalar mirrors of the
// packed FMA group, one half-precision value per lane, the 132, 213 and
// 231 pairings of the multiply-add and the multiply-subtract. The
// scalar opcodes sit one above the packed ones, 99 the add and 9B the
// subtract, in the LIG shape the rest of the scalar core carries. The
// register forms take the embedded rounding, the memory shape of the
// second source reads its m16 plain.
{Name: "VFMADD132SH", Summary: "Multiply scalar FP16 values and add the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x99, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD132SH (EVEX.NDS.LIG.66.MAP6.W0 99 /r)"},
{Name: "VFMADD213SH", Summary: "Multiply scalar FP16 values and add the product, the destination supplying a factor and the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xA9, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD213SH (EVEX.NDS.LIG.66.MAP6.W0 A9 /r)"},
{Name: "VFMADD231SH", Summary: "Multiply scalar FP16 values and add the product, the destination supplying the added term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xB9, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMADD231SH (EVEX.NDS.LIG.66.MAP6.W0 B9 /r)"},
{Name: "VFMSUB132SH", Summary: "Multiply scalar FP16 values and subtract the product, the destination supplying a factor",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0x9B, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB132SH (EVEX.NDS.LIG.66.MAP6.W0 9B /r)"},
{Name: "VFMSUB213SH", Summary: "Multiply scalar FP16 values and subtract the product, the destination supplying a factor and the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xAB, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB213SH (EVEX.NDS.LIG.66.MAP6.W0 AB /r)"},
{Name: "VFMSUB231SH", Summary: "Multiply scalar FP16 values and subtract the product, the destination supplying the subtracted term",
Bytes: []byte{0x62, 0x06, 0x05, 0x00, 0xBB, 0xC0}, Form: ExtFormAmdVec3, Mem: 2, Er: true, Feature: ExtFeatureFP16,
Ref: "Intel SDM Vol. 2C, VFMSUB231SH (EVEX.NDS.LIG.66.MAP6.W0 BB /r)"},
}