On 12/17/22 10:21, Philippe Mathieu-Daudé wrote:
(unburying an old patch)
On 1/7/20 17:24, LIU Zhiwei wrote:
The unit-stride fault-only-fault load instructions are used to
vectorize loops with data-dependent exit conditions(while loops).
These instructions execute as a regular load except that they
will only take a trap on element 0.
Signed-off-by: LIU Zhiwei <zhiwei_...@c-sky.com>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
---
target/riscv/helper.h | 22 +++++
target/riscv/insn32.decode | 7 ++
target/riscv/insn_trans/trans_rvv.inc.c | 73 ++++++++++++++++
target/riscv/vector_helper.c | 110 ++++++++++++++++++++++++
4 files changed, 212 insertions(+)
+/*
+ *** unit-stride fault-only-fisrt load instructions
+ */
+static inline void
+vext_ldff(void *vd, void *v0, target_ulong base,
+ CPURISCVState *env, uint32_t desc,
+ vext_ldst_elem_fn *ldst_elem,
+ clear_fn *clear_elem,
+ uint32_t esz, uint32_t msz, uintptr_t ra)
+{
+ void *host;
+ uint32_t i, k, vl = 0;
+ uint32_t mlen = vext_mlen(desc);
+ uint32_t nf = vext_nf(desc);
+ uint32_t vm = vext_vm(desc);
+ uint32_t vlmax = vext_maxsz(desc) / esz;
+ target_ulong addr, offset, remain;
+
+ /* probe every access*/
+ for (i = 0; i < env->vl; i++) {
+ if (!vm && !vext_elem_mask(v0, mlen, i)) {
+ continue;
+ }
+ addr = base + nf * i * msz;
+ if (i == 0) {
+ probe_pages(env, addr, nf * msz, ra, MMU_DATA_LOAD);
Shouldn't we check page_check_range() in user-mode here?
No, stick to the common interface.
r~
