From: Vladimir Miloserdov <vladimir.miloser...@arm.com>
Hi All,
This patch introduces support for LUTI2/LUTI4 ACLE for SVE2.
LUTI instructions are used for efficient table lookups with 2-bit or 4-bit
indices. LUTI2 reads indexed 8-bit or 16-bit elements from the low 128 bits of
the table vector using packed 2-bit indices, while LUTI4 can read from the low
128 or 256 bits of the table vector or from two table vectors using packed
4-bit indices. These instructions fill the destination vector by copying
elements indexed by segments of the source vector, selected by the vector
segment index.
The changes include the addition of a new AArch64 option extension "lut",
__ARM_FEATURE_LUT preprocessor macro, definitions for the new LUTI instruction
shapes, and implementations of the svluti2 and svluti4 builtins.
Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.
This depends on "Extend aarch64_feature_flags to 128 bits" work which is soon
to be submitted upstream as we ran out of 64-bit flags.
The patch needs to be committed for me as I don't have commit rights.
Ok for master when the pre-requisites get committed?
BR,
- Vladimir
gcc/ChangeLog:
* config/aarch64/aarch64-c.cc (aarch64_update_cpp_builtins):
Add support for __ARM_FEATURE_LUT preprocessor macro.
* config/aarch64/aarch64-option-extensions.def (AARCH64_OPT_EXTENSION):
Add "lut" option extension.
* config/aarch64/aarch64-sve-builtins-shapes.cc (struct luti_base):
Define new LUTI ACLE shapes.
(SHAPE): Define shapes for luti2 and luti4.
* config/aarch64/aarch64-sve-builtins-shapes.h: Add declarations
for luti2 and luti4.
* config/aarch64/aarch64-sve-builtins-sve2.cc (class svluti_lane_impl):
Implement support for LUTI instructions.
(FUNCTION): Register svluti2 and svluti4 functions.
* config/aarch64/aarch64-sve-builtins-sve2.def (svluti2):
Define svluti2 function.
(svluti4): Define svluti4 function.
* config/aarch64/aarch64-sve-builtins-sve2.h: Add declarations
for svluti2 and svluti4.
* config/aarch64/aarch64-sve2.md (@aarch64_sve_luti<LUTI_BITS><mode>):
Define machine description patterns for LUTI.
* config/aarch64/aarch64.h (AARCH64_ISA_LUT): Define macro for LUTI.
(TARGET_LUT): Likewise.
* config/aarch64/iterators.md: Define mode iterators
for LUTI MD patterns.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/sve/acle/asm/test_sve_acle.h: Add macro for
SVE ACLE to enable LUTI tests.
* lib/target-supports.exp: Update to include check for the LUT feature.
* gcc.target/aarch64/sve2/acle/asm/luti2_bf16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti2_f16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti2_s16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti2_s8.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti2_u16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti2_u8.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_bf16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_bf16_vg1x2.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_f16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_f16_vg1x2.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_s16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_s16_vg1x2.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_s8.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_u16.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_u16_vg1x2.c: New test.
* gcc.target/aarch64/sve2/acle/asm/luti4_u8.c: New test.
