diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/memchr-avx2.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memchr-avx2.S | 58 |
1 files changed, 40 insertions, 18 deletions
diff --git a/sysdeps/x86_64/multiarch/memchr-avx2.S b/sysdeps/x86_64/multiarch/memchr-avx2.S index 8683d9d..9ddeab2 100644 --- a/sysdeps/x86_64/multiarch/memchr-avx2.S +++ b/sysdeps/x86_64/multiarch/memchr-avx2.S @@ -54,21 +54,19 @@ # define VEC_SIZE 32 # define PAGE_SIZE 4096 +# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) .section SECTION(.text),"ax",@progbits ENTRY (MEMCHR) # ifndef USE_AS_RAWMEMCHR /* Check for zero length. */ - test %RDX_LP, %RDX_LP - jz L(null) -# endif -# ifdef USE_AS_WMEMCHR - shl $2, %RDX_LP -# else # ifdef __ILP32__ - /* Clear the upper 32 bits. */ - movl %edx, %edx + /* Clear upper bits. */ + and %RDX_LP, %RDX_LP +# else + test %RDX_LP, %RDX_LP # endif + jz L(null) # endif /* Broadcast CHAR to YMMMATCH. */ vmovd %esi, %xmm0 @@ -84,7 +82,7 @@ ENTRY (MEMCHR) vpmovmskb %ymm1, %eax # ifndef USE_AS_RAWMEMCHR /* If length < CHAR_PER_VEC handle special. */ - cmpq $VEC_SIZE, %rdx + cmpq $CHAR_PER_VEC, %rdx jbe L(first_vec_x0) # endif testl %eax, %eax @@ -98,6 +96,10 @@ ENTRY (MEMCHR) L(first_vec_x0): /* Check if first match was before length. */ tzcntl %eax, %eax +# ifdef USE_AS_WMEMCHR + /* NB: Multiply length by 4 to get byte count. */ + sall $2, %edx +# endif xorl %ecx, %ecx cmpl %eax, %edx leaq (%rdi, %rax), %rax @@ -110,12 +112,12 @@ L(null): # endif .p2align 4 L(cross_page_boundary): - /* Save pointer before aligning as its original value is necessary - for computer return address if byte is found or adjusting length - if it is not and this is memchr. */ + /* Save pointer before aligning as its original value is + necessary for computer return address if byte is found or + adjusting length if it is not and this is memchr. */ movq %rdi, %rcx - /* Align data to VEC_SIZE - 1. ALGN_PTR_REG is rcx for memchr and - rdi for rawmemchr. */ + /* Align data to VEC_SIZE - 1. ALGN_PTR_REG is rcx for memchr + and rdi for rawmemchr. */ orq $(VEC_SIZE - 1), %ALGN_PTR_REG VPCMPEQ -(VEC_SIZE - 1)(%ALGN_PTR_REG), %ymm0, %ymm1 vpmovmskb %ymm1, %eax @@ -124,6 +126,10 @@ L(cross_page_boundary): match). */ leaq 1(%ALGN_PTR_REG), %rsi subq %RRAW_PTR_REG, %rsi +# ifdef USE_AS_WMEMCHR + /* NB: Divide bytes by 4 to get wchar_t count. */ + shrl $2, %esi +# endif # endif /* Remove the leading bytes. */ sarxl %ERAW_PTR_REG, %eax, %eax @@ -181,6 +187,10 @@ L(cross_page_continue): orq $(VEC_SIZE - 1), %rdi /* esi is for adjusting length to see if near the end. */ leal (VEC_SIZE * 4 + 1)(%rdi, %rcx), %esi +# ifdef USE_AS_WMEMCHR + /* NB: Divide bytes by 4 to get the wchar_t count. */ + sarl $2, %esi +# endif # else orq $(VEC_SIZE - 1), %rdi L(cross_page_continue): @@ -213,7 +223,7 @@ L(cross_page_continue): # ifndef USE_AS_RAWMEMCHR /* Check if at last VEC_SIZE * 4 length. */ - subq $(VEC_SIZE * 4), %rdx + subq $(CHAR_PER_VEC * 4), %rdx jbe L(last_4x_vec_or_less_cmpeq) /* Align data to VEC_SIZE * 4 - 1 for the loop and readjust length. */ @@ -221,6 +231,10 @@ L(cross_page_continue): movl %edi, %ecx orq $(VEC_SIZE * 4 - 1), %rdi andl $(VEC_SIZE * 4 - 1), %ecx +# ifdef USE_AS_WMEMCHR + /* NB: Divide bytes by 4 to get the wchar_t count. */ + sarl $2, %ecx +# endif addq %rcx, %rdx # else /* Align data to VEC_SIZE * 4 - 1 for loop. */ @@ -250,15 +264,19 @@ L(loop_4x_vec): subq $-(VEC_SIZE * 4), %rdi - subq $(VEC_SIZE * 4), %rdx + subq $(CHAR_PER_VEC * 4), %rdx ja L(loop_4x_vec) - /* Fall through into less than 4 remaining vectors of length case. - */ + /* 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): +# ifdef USE_AS_WMEMCHR + /* NB: Multiply length by 4 to get byte count. */ + sall $2, %edx +# endif /* Check if first VEC contained match. */ testl %eax, %eax jnz L(first_vec_x1_check) @@ -355,6 +373,10 @@ L(last_vec_x2_return): L(last_4x_vec_or_less_cmpeq): VPCMPEQ (VEC_SIZE * 4 + 1)(%rdi), %ymm0, %ymm1 vpmovmskb %ymm1, %eax +# ifdef USE_AS_WMEMCHR + /* NB: Multiply length by 4 to get byte count. */ + sall $2, %edx +# endif subq $-(VEC_SIZE * 4), %rdi /* Check first VEC regardless. */ testl %eax, %eax |