diff options
| author | Dongjiu Geng <gengdongjiu@huawei.com> | 2019-10-24 14:47:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-29 09:17:09 +0100 |
| commit | 1caa4f72dfc4a0401ec7fad210cfb0ed73d06b4d (patch) | |
| tree | 06d2c45c298e8d7de5657325673eac013ed6bb52 /Documentation | |
| parent | edcad64ed659810345a080e2aa16a16062a5e3ac (diff) | |
arm64: v8.4: Support for new floating point multiplication instructions
[ Upstream commit 3b3b681097fae73b7f5dcdd42db6cfdf32943d4c ]
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>
[ardb: fix up for missing SVE in context]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm64/cpu-feature-registers.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/arm64/cpu-feature-registers.txt b/Documentation/arm64/cpu-feature-registers.txt index 011ddfc1e570..ddd566fea3f2 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 | |--------------------------------------------------| |