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x86: Optimize memchr-avx2.S
No bug. This commit optimizes memchr-avx2.S. The optimizations include replacing some branches with cmovcc, avoiding some branches entirely in the less_4x_vec case, making the page cross logic less strict, asaving a few instructions the in loop return loop. test-memchr, test-rawmemchr, and test-wmemchr are all passing. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein
parent
77c1573dbc
commit
acfd088a19
@ -26,8 +26,22 @@
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# ifdef USE_AS_WMEMCHR
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# define VPCMPEQ vpcmpeqd
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# define VPBROADCAST vpbroadcastd
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# define CHAR_SIZE 4
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# else
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# define VPCMPEQ vpcmpeqb
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# define VPBROADCAST vpbroadcastb
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# define CHAR_SIZE 1
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# endif
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# ifdef USE_AS_RAWMEMCHR
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# define ERAW_PTR_REG ecx
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# define RRAW_PTR_REG rcx
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# define ALGN_PTR_REG rdi
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# else
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# define ERAW_PTR_REG edi
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# define RRAW_PTR_REG rdi
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# define ALGN_PTR_REG rcx
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# endif
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# ifndef VZEROUPPER
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@ -39,6 +53,7 @@
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# endif
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# define VEC_SIZE 32
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# define PAGE_SIZE 4096
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.section SECTION(.text),"ax",@progbits
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ENTRY (MEMCHR)
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@ -47,295 +62,349 @@ ENTRY (MEMCHR)
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test %RDX_LP, %RDX_LP
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jz L(null)
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# endif
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movl %edi, %ecx
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/* Broadcast CHAR to YMM0. */
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vmovd %esi, %xmm0
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# ifdef USE_AS_WMEMCHR
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shl $2, %RDX_LP
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vpbroadcastd %xmm0, %ymm0
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# else
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# ifdef __ILP32__
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/* Clear the upper 32 bits. */
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movl %edx, %edx
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# endif
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vpbroadcastb %xmm0, %ymm0
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# endif
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/* Broadcast CHAR to YMMMATCH. */
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vmovd %esi, %xmm0
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VPBROADCAST %xmm0, %ymm0
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/* Check if we may cross page boundary with one vector load. */
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andl $(2 * VEC_SIZE - 1), %ecx
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cmpl $VEC_SIZE, %ecx
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ja L(cros_page_boundary)
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movl %edi, %eax
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andl $(PAGE_SIZE - 1), %eax
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cmpl $(PAGE_SIZE - VEC_SIZE), %eax
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ja L(cross_page_boundary)
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/* Check the first VEC_SIZE bytes. */
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VPCMPEQ (%rdi), %ymm0, %ymm1
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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# ifndef USE_AS_RAWMEMCHR
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jnz L(first_vec_x0_check)
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/* Adjust length and check the end of data. */
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subq $VEC_SIZE, %rdx
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jbe L(zero)
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# else
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jnz L(first_vec_x0)
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/* If length < CHAR_PER_VEC handle special. */
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cmpq $VEC_SIZE, %rdx
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jbe L(first_vec_x0)
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# endif
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/* Align data for aligned loads in the loop. */
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addq $VEC_SIZE, %rdi
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andl $(VEC_SIZE - 1), %ecx
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andq $-VEC_SIZE, %rdi
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# ifndef USE_AS_RAWMEMCHR
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/* Adjust length. */
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addq %rcx, %rdx
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subq $(VEC_SIZE * 4), %rdx
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jbe L(last_4x_vec_or_less)
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# endif
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jmp L(more_4x_vec)
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.p2align 4
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L(cros_page_boundary):
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andl $(VEC_SIZE - 1), %ecx
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andq $-VEC_SIZE, %rdi
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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/* Remove the leading bytes. */
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sarl %cl, %eax
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testl %eax, %eax
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jz L(aligned_more)
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tzcntl %eax, %eax
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# ifndef USE_AS_RAWMEMCHR
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/* Check the end of data. */
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cmpq %rax, %rdx
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jbe L(zero)
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# endif
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addq %rdi, %rax
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addq %rcx, %rax
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L(return_vzeroupper):
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ZERO_UPPER_VEC_REGISTERS_RETURN
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.p2align 4
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L(aligned_more):
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# ifndef USE_AS_RAWMEMCHR
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/* Calculate "rdx + rcx - VEC_SIZE" with "rdx - (VEC_SIZE - rcx)"
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instead of "(rdx + rcx) - VEC_SIZE" to void possible addition
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overflow. */
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negq %rcx
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addq $VEC_SIZE, %rcx
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/* Check the end of data. */
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subq %rcx, %rdx
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jbe L(zero)
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# endif
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addq $VEC_SIZE, %rdi
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# ifndef USE_AS_RAWMEMCHR
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subq $(VEC_SIZE * 4), %rdx
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jbe L(last_4x_vec_or_less)
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# endif
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L(more_4x_vec):
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/* Check the first 4 * VEC_SIZE. Only one VEC_SIZE at a time
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since data is only aligned to VEC_SIZE. */
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x3)
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addq $(VEC_SIZE * 4), %rdi
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# ifndef USE_AS_RAWMEMCHR
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subq $(VEC_SIZE * 4), %rdx
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jbe L(last_4x_vec_or_less)
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# endif
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/* Align data to 4 * VEC_SIZE. */
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movq %rdi, %rcx
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andl $(4 * VEC_SIZE - 1), %ecx
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andq $-(4 * VEC_SIZE), %rdi
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# ifndef USE_AS_RAWMEMCHR
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/* Adjust length. */
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addq %rcx, %rdx
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# endif
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.p2align 4
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L(loop_4x_vec):
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/* Compare 4 * VEC at a time forward. */
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VPCMPEQ (%rdi), %ymm0, %ymm1
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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm2
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %ymm3
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %ymm4
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vpor %ymm1, %ymm2, %ymm5
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vpor %ymm3, %ymm4, %ymm6
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vpor %ymm5, %ymm6, %ymm5
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vpmovmskb %ymm5, %eax
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testl %eax, %eax
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jnz L(4x_vec_end)
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addq $(VEC_SIZE * 4), %rdi
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# ifdef USE_AS_RAWMEMCHR
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jmp L(loop_4x_vec)
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# else
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subq $(VEC_SIZE * 4), %rdx
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ja L(loop_4x_vec)
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L(last_4x_vec_or_less):
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/* Less than 4 * VEC and aligned to VEC_SIZE. */
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addl $(VEC_SIZE * 2), %edx
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jle L(last_2x_vec)
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x2_check)
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subl $VEC_SIZE, %edx
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jle L(zero)
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x3_check)
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xorl %eax, %eax
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VZEROUPPER_RETURN
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.p2align 4
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L(last_2x_vec):
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addl $(VEC_SIZE * 2), %edx
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0_check)
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subl $VEC_SIZE, %edx
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jle L(zero)
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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x1_check)
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xorl %eax, %eax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x0_check):
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# ifndef USE_AS_RAWMEMCHR
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.p2align 5
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L(first_vec_x0):
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/* Check if first match was before length. */
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tzcntl %eax, %eax
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/* Check the end of data. */
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cmpq %rax, %rdx
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jbe L(zero)
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addq %rdi, %rax
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xorl %ecx, %ecx
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cmpl %eax, %edx
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leaq (%rdi, %rax), %rax
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cmovle %rcx, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x1_check):
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tzcntl %eax, %eax
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/* Check the end of data. */
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cmpq %rax, %rdx
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jbe L(zero)
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addq $VEC_SIZE, %rax
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x2_check):
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tzcntl %eax, %eax
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/* Check the end of data. */
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cmpq %rax, %rdx
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jbe L(zero)
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addq $(VEC_SIZE * 2), %rax
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x3_check):
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tzcntl %eax, %eax
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/* Check the end of data. */
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cmpq %rax, %rdx
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jbe L(zero)
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addq $(VEC_SIZE * 3), %rax
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(zero):
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xorl %eax, %eax
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jmp L(return_vzeroupper)
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.p2align 4
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L(null):
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xorl %eax, %eax
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ret
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# endif
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.p2align 4
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L(first_vec_x0):
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L(cross_page_boundary):
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/* Save pointer before aligning as its original value is necessary
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for computer return address if byte is found or adjusting length
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if it is not and this is memchr. */
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movq %rdi, %rcx
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/* Align data to VEC_SIZE - 1. ALGN_PTR_REG is rcx for memchr and
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rdi for rawmemchr. */
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orq $(VEC_SIZE - 1), %ALGN_PTR_REG
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VPCMPEQ -(VEC_SIZE - 1)(%ALGN_PTR_REG), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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# ifndef USE_AS_RAWMEMCHR
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/* Calculate length until end of page (length checked for a
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match). */
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leaq 1(%ALGN_PTR_REG), %rsi
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subq %RRAW_PTR_REG, %rsi
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# endif
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/* Remove the leading bytes. */
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sarxl %ERAW_PTR_REG, %eax, %eax
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# ifndef USE_AS_RAWMEMCHR
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/* Check the end of data. */
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cmpq %rsi, %rdx
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jbe L(first_vec_x0)
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# endif
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testl %eax, %eax
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jz L(cross_page_continue)
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tzcntl %eax, %eax
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addq %rdi, %rax
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VZEROUPPER_RETURN
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addq %RRAW_PTR_REG, %rax
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L(return_vzeroupper):
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ZERO_UPPER_VEC_REGISTERS_RETURN
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.p2align 4
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L(first_vec_x1):
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tzcntl %eax, %eax
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addq $VEC_SIZE, %rax
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incq %rdi
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x2):
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tzcntl %eax, %eax
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addq $(VEC_SIZE * 2), %rax
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addq $(VEC_SIZE + 1), %rdi
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(4x_vec_end):
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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vpmovmskb %ymm2, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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vpmovmskb %ymm3, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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vpmovmskb %ymm4, %eax
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testl %eax, %eax
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L(first_vec_x3):
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tzcntl %eax, %eax
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addq $(VEC_SIZE * 3), %rax
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addq $(VEC_SIZE * 2 + 1), %rdi
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(first_vec_x4):
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tzcntl %eax, %eax
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addq $(VEC_SIZE * 3 + 1), %rdi
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addq %rdi, %rax
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VZEROUPPER_RETURN
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.p2align 4
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L(aligned_more):
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/* Check the first 4 * VEC_SIZE. Only one VEC_SIZE at a time
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since data is only aligned to VEC_SIZE. */
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# ifndef USE_AS_RAWMEMCHR
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L(cross_page_continue):
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/* Align data to VEC_SIZE - 1. */
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xorl %ecx, %ecx
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subl %edi, %ecx
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orq $(VEC_SIZE - 1), %rdi
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/* esi is for adjusting length to see if near the end. */
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leal (VEC_SIZE * 4 + 1)(%rdi, %rcx), %esi
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# else
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orq $(VEC_SIZE - 1), %rdi
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L(cross_page_continue):
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# endif
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/* Load first VEC regardless. */
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VPCMPEQ 1(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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# ifndef USE_AS_RAWMEMCHR
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/* Adjust length. If near end handle specially. */
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subq %rsi, %rdx
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jbe L(last_4x_vec_or_less)
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# endif
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMPEQ (VEC_SIZE + 1)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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VPCMPEQ (VEC_SIZE * 2 + 1)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x3)
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VPCMPEQ (VEC_SIZE * 3 + 1)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x4)
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# ifndef USE_AS_RAWMEMCHR
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/* Check if at last VEC_SIZE * 4 length. */
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subq $(VEC_SIZE * 4), %rdx
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jbe L(last_4x_vec_or_less_cmpeq)
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/* Align data to VEC_SIZE * 4 - 1 for the loop and readjust
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length. */
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incq %rdi
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movl %edi, %ecx
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orq $(VEC_SIZE * 4 - 1), %rdi
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andl $(VEC_SIZE * 4 - 1), %ecx
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addq %rcx, %rdx
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# else
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/* Align data to VEC_SIZE * 4 - 1 for loop. */
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incq %rdi
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orq $(VEC_SIZE * 4 - 1), %rdi
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# endif
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/* Compare 4 * VEC at a time forward. */
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.p2align 4
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L(loop_4x_vec):
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VPCMPEQ 1(%rdi), %ymm0, %ymm1
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VPCMPEQ (VEC_SIZE + 1)(%rdi), %ymm0, %ymm2
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VPCMPEQ (VEC_SIZE * 2 + 1)(%rdi), %ymm0, %ymm3
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VPCMPEQ (VEC_SIZE * 3 + 1)(%rdi), %ymm0, %ymm4
|
||||
vpor %ymm1, %ymm2, %ymm5
|
||||
vpor %ymm3, %ymm4, %ymm6
|
||||
vpor %ymm5, %ymm6, %ymm5
|
||||
|
||||
vpmovmskb %ymm5, %ecx
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
testl %ecx, %ecx
|
||||
jz L(loop_4x_vec)
|
||||
# else
|
||||
testl %ecx, %ecx
|
||||
jnz L(loop_4x_vec_end)
|
||||
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
ja L(loop_4x_vec)
|
||||
|
||||
/* Fall through into less than 4 remaining vectors of length case.
|
||||
*/
|
||||
VPCMPEQ (VEC_SIZE * 0 + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
.p2align 4
|
||||
L(last_4x_vec_or_less):
|
||||
/* Check if first VEC contained match. */
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1_check)
|
||||
|
||||
/* If remaining length > VEC_SIZE * 2. */
|
||||
addl $(VEC_SIZE * 2), %edx
|
||||
jg L(last_4x_vec)
|
||||
|
||||
L(last_2x_vec):
|
||||
/* If remaining length < VEC_SIZE. */
|
||||
addl $VEC_SIZE, %edx
|
||||
jle L(zero_end)
|
||||
|
||||
/* Check VEC2 and compare any match with remaining length. */
|
||||
VPCMPEQ (VEC_SIZE + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
tzcntl %eax, %eax
|
||||
cmpl %eax, %edx
|
||||
jbe L(set_zero_end)
|
||||
addq $(VEC_SIZE + 1), %rdi
|
||||
addq %rdi, %rax
|
||||
L(zero_end):
|
||||
VZEROUPPER_RETURN
|
||||
|
||||
.p2align 4
|
||||
L(loop_4x_vec_end):
|
||||
# endif
|
||||
/* rawmemchr will fall through into this if match was found in
|
||||
loop. */
|
||||
|
||||
vpmovmskb %ymm1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x1_return)
|
||||
|
||||
vpmovmskb %ymm2, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x2_return)
|
||||
|
||||
vpmovmskb %ymm3, %eax
|
||||
/* Combine VEC3 matches (eax) with VEC4 matches (ecx). */
|
||||
salq $32, %rcx
|
||||
orq %rcx, %rax
|
||||
tzcntq %rax, %rax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
subq $(VEC_SIZE * 2 - 1), %rdi
|
||||
# else
|
||||
subq $-(VEC_SIZE * 2 + 1), %rdi
|
||||
# endif
|
||||
addq %rdi, %rax
|
||||
VZEROUPPER_RETURN
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1_check):
|
||||
tzcntl %eax, %eax
|
||||
/* Adjust length. */
|
||||
subl $-(VEC_SIZE * 4), %edx
|
||||
/* Check if match within remaining length. */
|
||||
cmpl %eax, %edx
|
||||
jbe L(set_zero_end)
|
||||
incq %rdi
|
||||
addq %rdi, %rax
|
||||
VZEROUPPER_RETURN
|
||||
.p2align 4
|
||||
L(set_zero_end):
|
||||
xorl %eax, %eax
|
||||
VZEROUPPER_RETURN
|
||||
# endif
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x1_return):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
subq $(VEC_SIZE * 4 - 1), %rdi
|
||||
# else
|
||||
incq %rdi
|
||||
# endif
|
||||
addq %rdi, %rax
|
||||
VZEROUPPER_RETURN
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x2_return):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
subq $(VEC_SIZE * 3 - 1), %rdi
|
||||
# else
|
||||
subq $-(VEC_SIZE + 1), %rdi
|
||||
# endif
|
||||
addq %rdi, %rax
|
||||
VZEROUPPER_RETURN
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
.p2align 4
|
||||
L(last_4x_vec_or_less_cmpeq):
|
||||
VPCMPEQ (VEC_SIZE * 4 + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
/* Check first VEC regardless. */
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1_check)
|
||||
|
||||
/* If remaining length <= CHAR_PER_VEC * 2. */
|
||||
addl $(VEC_SIZE * 2), %edx
|
||||
jle L(last_2x_vec)
|
||||
.p2align 4
|
||||
L(last_4x_vec):
|
||||
VPCMPEQ (VEC_SIZE + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x2_return)
|
||||
|
||||
VPCMPEQ (VEC_SIZE * 2 + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
|
||||
/* Create mask for possible matches within remaining length. */
|
||||
movq $-1, %rcx
|
||||
bzhiq %rdx, %rcx, %rcx
|
||||
|
||||
/* Test matches in data against length match. */
|
||||
andl %ecx, %eax
|
||||
jnz L(last_vec_x3)
|
||||
|
||||
/* if remaining length <= VEC_SIZE * 3 (Note this is after
|
||||
remaining length was found to be > VEC_SIZE * 2. */
|
||||
subl $VEC_SIZE, %edx
|
||||
jbe L(zero_end2)
|
||||
|
||||
VPCMPEQ (VEC_SIZE * 3 + 1)(%rdi), %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
/* Shift remaining length mask for last VEC. */
|
||||
shrq $32, %rcx
|
||||
andl %ecx, %eax
|
||||
jz L(zero_end2)
|
||||
tzcntl %eax, %eax
|
||||
addq $(VEC_SIZE * 3 + 1), %rdi
|
||||
addq %rdi, %rax
|
||||
L(zero_end2):
|
||||
VZEROUPPER_RETURN
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x3):
|
||||
tzcntl %eax, %eax
|
||||
subq $-(VEC_SIZE * 2 + 1), %rdi
|
||||
addq %rdi, %rax
|
||||
VZEROUPPER_RETURN
|
||||
# endif
|
||||
|
||||
END (MEMCHR)
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user