Hi,
Please find attached the patch that implements automod load and store for
Thunderx2t99.
The patch doesn't change spec but improve other benchmarks.
Bootstrapped and Regression tested on aarch64-thunder-linux.
Please review the patch and let us know if its okay for Stage-1?
Thanks,
Naveen
2017-03-06 Julian Brown
Naveen H.S
* config/aarch64/aarch64-protos.h (aarch64_automod_addr_only_dep): Add
prototype.
* config/aarch64/aarch64.c (aarch64_automod_addr_only_dep): New
function.
* config/aarch64/thunderx2t99.md (thunderx2t99_load_basic)
(thunderx2t99_store_basic, thunderx2t99_storepair_basic)
(thunderx2t99_fp_load_basic, thunderx2t99_fp_loadpair_basic)
(thunderx2t99_fp_storepair_basic): Add aarch64_mem_type_p test.
(thunderx2t99_load_automod, thunderx2t99_load_regoffset)
(thunderx2t99_load_scale_ext, thunderx2t99_store_automod)
(thunderx2t99_store_regoffset_scale_ext, thunderx2t99_fp_load_automod)
(thunderx2t99_storepair_automod, thunderx2t99_fp_load_regoffset)
(thunderx2t99_fp_load_scale_ext, thunderx2t99_fp_loadpair_automod)
(thunderx2t99_fp_store_automod, thunderx2t99_fp_storepair_automod)
(thunderx2t99_fp_store_regoffset_scale_ext): New insn reservations.
(thunderx2t99_load_automod, thunderx2t99_fp_load_automod)
(thunderx2t99_fp_loadpair_automod): Add bypass for output address-only
dependencies.
diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h
index e045df8..7472d98 100644
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -488,5 +488,6 @@ std::string aarch64_get_extension_string_for_isa_flags (unsigned long,
unsigned long);
rtl_opt_pass *make_pass_fma_steering (gcc::context *ctxt);
+int aarch64_automod_addr_only_dep (rtx_insn *, rtx_insn *);
#endif /* GCC_AARCH64_PROTOS_H */
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 62f5461..c674c51 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -14875,6 +14875,94 @@ aarch64_run_selftests (void)
#endif /* #if CHECKING_P */
+/* Return nonzero if the CONSUMER has a dependency only on an automodify
+ address in PRODUCER (a load instruction, i.e. the dependency is not on the
+ loaded value). */
+
+int
+aarch64_automod_addr_only_dep (rtx_insn *producer, rtx_insn *consumer)
+{
+ rtx prod_set = single_set (producer);
+
+ if (prod_set)
+{
+ rtx dst, src = SET_SRC (prod_set);
+
+ if (GET_CODE (src) == ZERO_EXTEND || GET_CODE (src) == SIGN_EXTEND)
+ src = XEXP (src, 0);
+
+ gcc_assert (MEM_P (src));
+
+ dst = XEXP (prod_set, 0);
+
+ rtx cons_set = single_set (consumer);
+ rtx cons_pat = PATTERN (consumer);
+
+ if (cons_set)
+ return !reg_overlap_mentioned_p (dst, cons_set);
+ else if (GET_CODE (cons_pat) == PARALLEL)
+ {
+ for (int i = 0; i < XVECLEN (cons_pat, 0); i++)
+ {
+ rtx set = XVECEXP (cons_pat, 0, i);
+
+ if (GET_CODE (set) != SET)
+ continue;
+
+ if (reg_overlap_mentioned_p (dst, set))
+ return 0;
+ }
+ }
+ else
+ return 0;
+}
+ else if (GET_CODE (PATTERN (producer)) == PARALLEL)
+{
+ rtx prod_pat = PATTERN (producer);
+ rtx cons_set = single_set (consumer);
+ rtx cons_pat = PATTERN (consumer);
+
+ for (int i = 0; i < XVECLEN (prod_pat, 0); i++)
+ {
+ prod_set = XVECEXP (prod_pat, 0, i);
+
+ if (GET_CODE (prod_set) == SET)
+ {
+ rtx src = XEXP (prod_set, 1), dst = XEXP (prod_set, 0);
+
+ if (GET_CODE (src) == ZERO_EXTEND
+ || GET_CODE (src) == SIGN_EXTEND)
+ src = XEXP (src, 0);
+
+ gcc_assert (MEM_P (src));
+
+ if (cons_set)
+ {
+ if (reg_overlap_mentioned_p (dst, cons_set))
+ return 0;
+ }
+ else if (GET_CODE (cons_pat) == PARALLEL)
+ {
+ for (int i = 0; i < XVECLEN (cons_pat, 0); i++)
+ {
+ rtx set = XVECEXP (cons_pat, 0, i);
+
+ if (GET_CODE (set) != SET)
+ continue;
+
+ if (reg_overlap_mentioned_p (dst, set))
+ return 0;
+ }
+ }
+ else
+ return 0;
+ }
+ }
+}
+
+ return 1;
+}
+
#undef TARGET_ADDRESS_COST
#define TARGET_ADDRESS_COST aarch64_address_cost
diff --git a/gcc/config/aarch64/thunderx2t99.md b/gcc/config/aarch64/thunderx2t99.md
index 936078c..add3707 100644
--- a/gcc/config/aarch64/thunderx2t99.md
+++ b/gcc/config/aarch64/thunderx2t99.md
@@ -123,24 +123,73 @@
(define_insn_reservation "thunderx2t99_load_basic" 4
(and (eq_attr "tune" "thunderx2t99")
- (eq_attr "type" "load1"))
+ (eq_attr "type" "load1")
+ (match_test "aarch64_mem_type_p (insn, AARCH64_ADDR_SYMBOLIC
+ | AARCH64_ADDR_REG_IMM
+ | AARCH64_ADDR_LO_SUM)"))
"thunderx2t99_ls01")
+(define_insn_reservation "thunderx2t99_load_automod" 4
+ (and (eq_attr "tune" "thunderx2t99")
+ (eq_attr "type" "
