Hi,
This version fixes several issues in v5
- The cross page bound checking issue
- The mismatch vl comparison in the early exit checking of vext_ldst_us
- The endian issue when host is big endian
Thank for Richard Henderson's suggestions that this version unrolled the
loop in helper functions of unmasked vector unit-stride load/store
instructions, etc.
And this version also extends the optimizations to the unmasked vector
fault-only-first load instruction.
Some performance result of this version
1. Test case provided in
https://gitlab.com/qemu-project/qemu/-/issues/2137#note_1757501369
- QEMU user mode (vlen=128):
- Original: ~11.8 sec
- v5: ~1.3 sec
- v6: ~1.2 sec
- QEMU system mode (vlen=128):
- Original: ~29.4 sec
- v5: ~1.6 sec
- v6: ~1.6 sec
2. SPEC CPU2006 INT (test input)
- QEMU user mode (vlen=128)
- Original: ~459.1 sec
- v5: ~300.0 sec
- v6: ~280.6 sec
3. SPEC CPU2017 intspeed (test input)
- QEMU user mode (vlen=128)
- Original: ~2475.9 sec
- v5: ~1702.6 sec
- v6: ~1663.4 sec
This version is based on the riscv-to-apply.next branch(commit 90d5d3c).
Changes from v5:
- patch 2
- Replace the VSTART_CHECK_EARLY_EXIT function by checking the
correct evl in vext_ldst_us.
- patch 3
- Unroll the memory load/store loop
- Fix the bound checking issue in cross page elements
- Fix the endian issue in GEN_VEXT_LD_ELEM/GEN_VEXT_ST_ELEM
- Pass in mmu_index for vext_page_ldst_us
- Reduce the flag & host checking
- patch 4
- Unroll the memory load/store loop
- Fix the bound checking issue in cross page elements
- patch 5
- Extend optimizations to unmasked vector fault-only-first load
instruction
- patch 6
- Switch to memcpy only when doing byte load/store
- patch 7
- Inline the vext_page_ldst_us function
Previous versions:
- v1: https://lore.kernel.org/all/20240215192823.729209-1-max.c...@sifive.com/
- v2: https://lore.kernel.org/all/20240531174504.281461-1-max.c...@sifive.com/
- v3: https://lore.kernel.org/all/20240613141906.1276105-1-max.c...@sifive.com/
- v4: https://lore.kernel.org/all/20240613175122.1299212-1-max.c...@sifive.com/
- v5: https://lore.kernel.org/all/20240717133936.713642-1-max.c...@sifive.com/
Max Chou (7):
target/riscv: Set vdata.vm field for vector load/store whole register
instructions
target/riscv: rvv: Replace VSTART_CHECK_EARLY_EXIT in vext_ldst_us
target/riscv: rvv: Provide a fast path using direct access to host ram
for unmasked unit-stride load/store
target/riscv: rvv: Provide a fast path using direct access to host ram
for unit-stride whole register load/store
target/riscv: rvv: Provide a fast path using direct access to host ram
for unit-stride load-only-first load instructions
target/riscv: rvv: Provide group continuous ld/st flow for unit-stride
ld/st instructions
target/riscv: Inline unit-stride ld/st and corresponding functions for
performance
target/riscv/insn_trans/trans_rvv.c.inc | 3 +
target/riscv/vector_helper.c | 598 ++++++++++++++++--------
2 files changed, 400 insertions(+), 201 deletions(-)
--
2.34.1
