diff options
| -rw-r--r-- | sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 50 |
1 files changed, 28 insertions, 22 deletions
diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S index 08cfa49..ff19684 100644 --- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S @@ -173,17 +173,22 @@ ENTRY (MEMSET_SYMBOL (__memset, unaligned_erms)) VMOVU %VEC(0), (%rdi) VZEROUPPER_RETURN + .p2align 4 L(stosb_more_2x_vec): cmp __x86_rep_stosb_threshold(%rip), %RDX_LP ja L(stosb) +#else + .p2align 4 #endif L(more_2x_vec): - cmpq $(VEC_SIZE * 4), %rdx - ja L(loop_start) + /* Stores to first 2x VEC before cmp as any path forward will + require it. */ VMOVU %VEC(0), (%rdi) VMOVU %VEC(0), VEC_SIZE(%rdi) - VMOVU %VEC(0), -VEC_SIZE(%rdi,%rdx) + cmpq $(VEC_SIZE * 4), %rdx + ja L(loop_start) VMOVU %VEC(0), -(VEC_SIZE * 2)(%rdi,%rdx) + VMOVU %VEC(0), -VEC_SIZE(%rdi,%rdx) L(return): #if VEC_SIZE > 16 ZERO_UPPER_VEC_REGISTERS_RETURN @@ -192,28 +197,29 @@ L(return): #endif L(loop_start): - leaq (VEC_SIZE * 4)(%rdi), %rcx - VMOVU %VEC(0), (%rdi) - andq $-(VEC_SIZE * 4), %rcx - VMOVU %VEC(0), -VEC_SIZE(%rdi,%rdx) - VMOVU %VEC(0), VEC_SIZE(%rdi) - VMOVU %VEC(0), -(VEC_SIZE * 2)(%rdi,%rdx) VMOVU %VEC(0), (VEC_SIZE * 2)(%rdi) - VMOVU %VEC(0), -(VEC_SIZE * 3)(%rdi,%rdx) VMOVU %VEC(0), (VEC_SIZE * 3)(%rdi) - VMOVU %VEC(0), -(VEC_SIZE * 4)(%rdi,%rdx) - addq %rdi, %rdx - andq $-(VEC_SIZE * 4), %rdx - cmpq %rdx, %rcx - je L(return) + cmpq $(VEC_SIZE * 8), %rdx + jbe L(loop_end) + andq $-(VEC_SIZE * 2), %rdi + subq $-(VEC_SIZE * 4), %rdi + leaq -(VEC_SIZE * 4)(%rax, %rdx), %rcx + .p2align 4 L(loop): - VMOVA %VEC(0), (%rcx) - VMOVA %VEC(0), VEC_SIZE(%rcx) - VMOVA %VEC(0), (VEC_SIZE * 2)(%rcx) - VMOVA %VEC(0), (VEC_SIZE * 3)(%rcx) - addq $(VEC_SIZE * 4), %rcx - cmpq %rcx, %rdx - jne L(loop) + VMOVA %VEC(0), (%rdi) + VMOVA %VEC(0), VEC_SIZE(%rdi) + VMOVA %VEC(0), (VEC_SIZE * 2)(%rdi) + VMOVA %VEC(0), (VEC_SIZE * 3)(%rdi) + subq $-(VEC_SIZE * 4), %rdi + cmpq %rcx, %rdi + jb L(loop) +L(loop_end): + /* NB: rax is set as ptr in MEMSET_VDUP_TO_VEC0_AND_SET_RETURN. + rdx as length is also unchanged. */ + VMOVU %VEC(0), -(VEC_SIZE * 4)(%rax, %rdx) + VMOVU %VEC(0), -(VEC_SIZE * 3)(%rax, %rdx) + VMOVU %VEC(0), -(VEC_SIZE * 2)(%rax, %rdx) + VMOVU %VEC(0), -VEC_SIZE(%rax, %rdx) VZEROUPPER_SHORT_RETURN .p2align 4 |