diff options
| author | Dongjiu Geng <gengdongjiu@huawei.com> | 2017-12-13 13:13:56 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-01-05 14:29:48 +0300 |
| commit | 3b3b681097fae73b7f5dcdd42db6cfdf32943d4c (patch) | |
| tree | 514122d4fd4358c7dfda62c2294ad31215e0aed6 /Documentation/arm64 | |
| parent | a8ffaaa060b8d4da6138e0958cb0f45b73e1cb78 (diff) | |
| download | linux-3b3b681097fae73b7f5dcdd42db6cfdf32943d4c.tar.xz | |
arm64: v8.4: Support for new floating point multiplication instructions
ARM v8.4 extensions add new neon instructions for performing a
multiplication of each FP16 element of one vector with the corresponding
FP16 element of a second vector, and to add or subtract this without an
intermediate rounding to the corresponding FP32 element in a third vector.
This patch detects this feature and let the userspace know about it via a
HWCAP bit and MRS emulation.
Cc: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/arm64')
| -rw-r--r-- | Documentation/arm64/cpu-feature-registers.txt | 4 | ||||
| -rw-r--r-- | Documentation/arm64/elf_hwcaps.txt | 4 |
2 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/arm64/cpu-feature-registers.txt b/Documentation/arm64/cpu-feature-registers.txt index bd9b3faab2c4..a70090b28b07 100644 --- a/Documentation/arm64/cpu-feature-registers.txt +++ b/Documentation/arm64/cpu-feature-registers.txt @@ -110,7 +110,9 @@ infrastructure: x--------------------------------------------------x | Name | bits | visible | |--------------------------------------------------| - | RES0 | [63-48] | n | + | RES0 | [63-52] | n | + |--------------------------------------------------| + | FHM | [51-48] | y | |--------------------------------------------------| | DP | [47-44] | y | |--------------------------------------------------| diff --git a/Documentation/arm64/elf_hwcaps.txt b/Documentation/arm64/elf_hwcaps.txt index 89edba12a9e0..57324ee55ecc 100644 --- a/Documentation/arm64/elf_hwcaps.txt +++ b/Documentation/arm64/elf_hwcaps.txt @@ -158,3 +158,7 @@ HWCAP_SHA512 HWCAP_SVE Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001. + +HWCAP_ASIMDFHM + + Functionality implied by ID_AA64ISAR0_EL1.FHM == 0b0001. |