On 08/03/17 17:39, James Greenhalgh wrote:
On Mon, Mar 06, 2017 at 05:09:58AM +0000, Hurugalawadi, Naveen wrote:
Hi,
Please find attached the patch that adds aes and sha reservations for
Thunderx2t99.
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 <jul...@codesourcery.com>
Naveen H.S <naveen.hurugalaw...@cavium.com>
* config/aarch64/thunderx2t99.md (thunderx2t99_crc): New Reservation.
diff --git a/gcc/config/aarch64/thunderx2t99.md
b/gcc/config/aarch64/thunderx2t99.md
index f807547..2eb136b 100644
--- a/gcc/config/aarch64/thunderx2t99.md
+++ b/gcc/config/aarch64/thunderx2t99.md
@@ -443,7 +443,22 @@
(eq_attr "type" "neon_store2_one_lane,neon_store2_one_lane_q"))
"thunderx2t99_ls01,thunderx2t99_f01")
+;; Crypto extensions.
+
+; FIXME: Forwarding path for aese/aesmc or aesd/aesimc pairs?
Do you need these if you've enabled instruction fusion?
I'd recommend it if one wants to bring the pairs together.
I'm not sure on the exact mechanics of how instruction fusion works, and
whether you'd get further scheduling benefits from modeling a forwarding
path if one exists.
The (macro) fusion mechanism in the scheduler makes sure to keep
the pairs together if they appear together before scheduling, but doesn't
do anything to actually bring them together if they are far apart.
So having bypasses would encourage the scheduler to form pairs more
aggressively.
(These are not objections to the patch, just some background)
Kyrill
Regardless, this patch is OK for Stage 1.
Thanks,
James
+(define_insn_reservation "thunderx2t99_aes" 5
+ (and (eq_attr "tune" "thunderx2t99")
+ (eq_attr "type" "crypto_aese,crypto_aesmc"))
+ "thunderx2t99_f1")
+
(define_insn_reservation "thunderx2t99_pmull" 5
(and (eq_attr "tune" "thunderx2t99")
(eq_attr "type" "crypto_pmull"))
"thunderx2t99_f1")
+
+(define_insn_reservation "thunderx2t99_sha" 7
+ (and (eq_attr "tune" "thunderx2t99")
+ (eq_attr "type" "crypto_sha1_fast,crypto_sha1_xor,crypto_sha1_slow,\
+ crypto_sha256_fast,crypto_sha256_slow"))
+ "thunderx2t99_f1")
