diff options
Diffstat (limited to 'sysdeps/aarch64')
| -rw-r--r-- | sysdeps/aarch64/multiarch/memmove_falkor.S | 46 |
1 files changed, 28 insertions, 18 deletions
diff --git a/sysdeps/aarch64/multiarch/memmove_falkor.S b/sysdeps/aarch64/multiarch/memmove_falkor.S index 3375adf2de..c0d9560301 100644 --- a/sysdeps/aarch64/multiarch/memmove_falkor.S +++ b/sysdeps/aarch64/multiarch/memmove_falkor.S @@ -150,7 +150,6 @@ L(copy96): .p2align 4 L(copy_long): - sub count, count, 64 + 16 /* Test and readjust count. */ mov B_l, Q_l mov B_h, Q_h ldp A_l, A_h, [src] @@ -161,6 +160,8 @@ L(copy_long): ldp Q_l, Q_h, [src, 16]! stp A_l, A_h, [dstin] ldp A_l, A_h, [src, 16]! + subs count, count, 32 + 64 + 16 /* Test and readjust count. */ + b.ls L(last64) L(loop64): subs count, count, 32 @@ -170,18 +171,22 @@ L(loop64): ldp A_l, A_h, [src, 16]! b.hi L(loop64) - /* Write the last full set of 32 bytes. The remainder is at most 32 - bytes, so it is safe to always copy 32 bytes from the end even if - there is just 1 byte left. */ + /* Write the last full set of 64 bytes. The remainder is at most 64 + bytes and at least 33 bytes, so it is safe to always copy 64 bytes + from the end. */ L(last64): - ldp C_l, C_h, [srcend, -32] + ldp C_l, C_h, [srcend, -64] stp Q_l, Q_h, [dst, 16] - ldp Q_l, Q_h, [srcend, -16] - stp A_l, A_h, [dst, 32] - stp C_l, C_h, [dstend, -32] - stp Q_l, Q_h, [dstend, -16] mov Q_l, B_l mov Q_h, B_h + ldp B_l, B_h, [srcend, -48] + stp A_l, A_h, [dst, 32] + ldp A_l, A_h, [srcend, -32] + ldp D_l, D_h, [srcend, -16] + stp C_l, C_h, [dstend, -64] + stp B_l, B_h, [dstend, -48] + stp A_l, A_h, [dstend, -32] + stp D_l, D_h, [dstend, -16] ret .p2align 4 @@ -204,7 +209,8 @@ L(move_long): sub count, count, tmp1 ldp A_l, A_h, [srcend, -16]! sub dstend, dstend, tmp1 - sub count, count, 64 + subs count, count, 32 + 64 + b.ls 2f 1: subs count, count, 32 @@ -214,18 +220,22 @@ L(move_long): ldp A_l, A_h, [srcend, -16]! b.hi 1b - /* Write the last full set of 32 bytes. The remainder is at most 32 - bytes, so it is safe to always copy 32 bytes from the start even if - there is just 1 byte left. */ + /* Write the last full set of 64 bytes. The remainder is at most 64 + bytes and at least 33 bytes, so it is safe to always copy 64 bytes + from the start. */ 2: - ldp C_l, C_h, [src, 16] + ldp C_l, C_h, [src, 48] stp Q_l, Q_h, [dstend, -16] - ldp Q_l, Q_h, [src] - stp A_l, A_h, [dstend, -32] - stp C_l, C_h, [dstin, 16] - stp Q_l, Q_h, [dstin] mov Q_l, B_l mov Q_h, B_h + ldp B_l, B_h, [src, 32] + stp A_l, A_h, [dstend, -32] + ldp A_l, A_h, [src, 16] + ldp D_l, D_h, [src] + stp C_l, C_h, [dstin, 48] + stp B_l, B_h, [dstin, 32] + stp A_l, A_h, [dstin, 16] + stp D_l, D_h, [dstin] 3: ret END (__memmove_falkor) |